TY  - CONF
AU  - Milojković, Natalija
AU  - Simović, Bojana
AU  - Žunić, Milan
AU  - Dapčević, Aleksandra
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2196
AB  - Titanium dioxide exists in three different crystalline forms: anatase, rutile, and brookite.
It is well known that on heating, anatase and brookite can be easily transformed to rutile
which is considered as the most stable phase [1]. The aim of this study was to investigate
the influence of different dopants on anatase-rutile phase transition. Doped TiO2 samples
(TiO2-M, M = V, Mn, and Cu) containing 5 at% of the dopant were prepared by mixing
anatase and appropriate oxide (V2O5, MnO2, and CuO) in agate mortar for 30 min. In
order to determine the heat treatment conditions, TG/DTA analysis of the samples was
performed. Finally, mixed powders as well as the pure anatase phase (TiO2) were heat
treated at 700 °C for 3 h. XRD analysis was performed to estimate the phase composition,
unit cell parameters, and crystallite sizes. Rutile was formed in all samples: 2.8 wt% in
TiO2, 25.5 wt% in TiO2-Mn, 75.8 wt% in TiO2-V, and 95.2 wt% in TiO2-Cu. In TiO2-
Mn, TiO2-V, and TiO2, anatase was present beside rutile, while in the case of TiO2-Cu
4.8 wt% of the unreacted CuO was found. Obtained results revealed that all the dopants
accelerated anatase-rutile phase transition in the following order: Cu2+ > V5+ > Mn4+. It
is well known that defects are the driving force for the anatase-rutile phase transition and
since Ti4+ and Mn4+ are isovalent, no new defects were formed by incorporating Mn4+
ions into TiO2 lattice. This resulted in the least amount of rutile in TiO2-Mn comparing
to TiO2-V and TiO2-Cu where new defects were probably formed. As no initial oxides
were found in TiO2-Mn and TiO2-V, it can be concluded that Mn4+ and V5+ ions were
incorporated into the anatase lattice. On the other hand, in the case of TiO2-Cu, even 4.8
wt% of initial CuO was found. The detected residue of CuO can be explained by the fact
that the ionic radius of Cu2+ for an octahedral environment (0.870 Å) is much larger than
that of Ti4+ (0.745 Å), unlike those for Mn4+ (0.670 Å) and V5+ (0.680 Å). Although
almost all introduced quantity of CuO, i.e. 96 %, was found in TiO2-Cu, a small amount
was surely necessary to cause the anatase-rutile phase transition. According to calculated
crystallite sizes which were in the range of 55 – 90 nm, nanocrystalline samples were
prepared.
1. P. I. Gouma, M. J. Mills J. Am. Ceram. Soc. 2001, 84 (3) 619–622.
PB  - Serbian Chemical Society and Serbian Young Chemists’ Club, Belgrade, Serbia
C3  - 9th Conference of Young Chemists of Serbia, Novi Sad, Serbia
T1  - The influence of dopants on anatase-rutile phase transition
SP  - 164
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2196
ER  - 

@conference{
author = "Milojković, Natalija and Simović, Bojana and Žunić, Milan and Dapčević, Aleksandra",
year = "2023",
abstract = "Titanium dioxide exists in three different crystalline forms: anatase, rutile, and brookite.
It is well known that on heating, anatase and brookite can be easily transformed to rutile
which is considered as the most stable phase [1]. The aim of this study was to investigate
the influence of different dopants on anatase-rutile phase transition. Doped TiO2 samples
(TiO2-M, M = V, Mn, and Cu) containing 5 at% of the dopant were prepared by mixing
anatase and appropriate oxide (V2O5, MnO2, and CuO) in agate mortar for 30 min. In
order to determine the heat treatment conditions, TG/DTA analysis of the samples was
performed. Finally, mixed powders as well as the pure anatase phase (TiO2) were heat
treated at 700 °C for 3 h. XRD analysis was performed to estimate the phase composition,
unit cell parameters, and crystallite sizes. Rutile was formed in all samples: 2.8 wt% in
TiO2, 25.5 wt% in TiO2-Mn, 75.8 wt% in TiO2-V, and 95.2 wt% in TiO2-Cu. In TiO2-
Mn, TiO2-V, and TiO2, anatase was present beside rutile, while in the case of TiO2-Cu
4.8 wt% of the unreacted CuO was found. Obtained results revealed that all the dopants
accelerated anatase-rutile phase transition in the following order: Cu2+ > V5+ > Mn4+. It
is well known that defects are the driving force for the anatase-rutile phase transition and
since Ti4+ and Mn4+ are isovalent, no new defects were formed by incorporating Mn4+
ions into TiO2 lattice. This resulted in the least amount of rutile in TiO2-Mn comparing
to TiO2-V and TiO2-Cu where new defects were probably formed. As no initial oxides
were found in TiO2-Mn and TiO2-V, it can be concluded that Mn4+ and V5+ ions were
incorporated into the anatase lattice. On the other hand, in the case of TiO2-Cu, even 4.8
wt% of initial CuO was found. The detected residue of CuO can be explained by the fact
that the ionic radius of Cu2+ for an octahedral environment (0.870 Å) is much larger than
that of Ti4+ (0.745 Å), unlike those for Mn4+ (0.670 Å) and V5+ (0.680 Å). Although
almost all introduced quantity of CuO, i.e. 96 %, was found in TiO2-Cu, a small amount
was surely necessary to cause the anatase-rutile phase transition. According to calculated
crystallite sizes which were in the range of 55 – 90 nm, nanocrystalline samples were
prepared.
1. P. I. Gouma, M. J. Mills J. Am. Ceram. Soc. 2001, 84 (3) 619–622.",
publisher = "Serbian Chemical Society and Serbian Young Chemists’ Club, Belgrade, Serbia",
journal = "9th Conference of Young Chemists of Serbia, Novi Sad, Serbia",
title = "The influence of dopants on anatase-rutile phase transition",
pages = "164",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2196"
}

Milojković, N., Simović, B., Žunić, M.,& Dapčević, A.. (2023). The influence of dopants on anatase-rutile phase transition. in 9th Conference of Young Chemists of Serbia, Novi Sad, Serbia
Serbian Chemical Society and Serbian Young Chemists’ Club, Belgrade, Serbia., 164.
https://hdl.handle.net/21.15107/rcub_rimsi_2196

Milojković N, Simović B, Žunić M, Dapčević A. The influence of dopants on anatase-rutile phase transition. in 9th Conference of Young Chemists of Serbia, Novi Sad, Serbia. 2023;:164.
https://hdl.handle.net/21.15107/rcub_rimsi_2196 .

Milojković, Natalija, Simović, Bojana, Žunić, Milan, Dapčević, Aleksandra, "The influence of dopants on anatase-rutile phase transition" in 9th Conference of Young Chemists of Serbia, Novi Sad, Serbia (2023):164,
https://hdl.handle.net/21.15107/rcub_rimsi_2196 .

TY  - CONF
AU  - Milojković, Natalija
AU  - Simović, Bojana
AU  - Žunić, Milan
AU  - Radovanovic, Lidija
AU  - Dapčević, Aleksandra
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2146
AB  - It is well known that titanium dioxide is usually used as a photocatalyst due to its
nontoxicity, low cost, and stability. Conductive polymer, polypyrrole (PPy) is also
appropriate for photocatalytic application being stable and easy to synthesize. The aim of
this study was to obtain TiO2/PPy composites reaching higher photocatalytic efficiency
compared to pure TiO2. Therefore, TiO2 was synthesized by the hydrothermal route,
while PPy was obtained by the chemical oxidative polymerization method. TiO2/x% PPy
nanocomposites (x = 0, 0.5, 1, 1.5, 3, 5 wt.%) were prepared by hand-mixing of powders
in agate mortar for 30 min in order to find the optimal PPy content. Obtained materials
were characterized by XRD, FTIR, TG/DSC, FESEM, and UV-Vis methods while their
photocatalytic activity was estimated towards degradation of Reactive Orange 16 dye
(RO16). A kinetic study was performed and a detailed mechanism of RO16
photocatalytic degradation in the presence of TiO2/PPy composites was proposed based
on scavenger tests. The results showed that, despite PPy addition, TiO2 was present in
anatase form in all samples with sufficiently small crystallites (around 26 nm) and
preserved structure with no significant deviations in unit cell parameters. The band gap
energy decreased with increasing of PPy content, from 3.14 eV for pure TiO2 to 2.94 eV
for TiO2/5% PPy. All the obtained nanocomposites demonstrated higher photocatalytic
activity than pure TiO2, whereby TiO2/1% PPy nanocomposite was the most efficient by
degrading 99.6% of the dye for 105 min under simulated solar light. Therefore, the
amount of 1 wt.% should be consider as optimal amount of PPy in a composite. It is
established that the photodegradation of RO16 using TiO2/PPy nanocomposites follows
pseudo-first kinetic order. RO16 photocatalytic degradation mechanism in the presence
of TiO2/PPy nanocomposites can be well described by direct Z-scheme heterojunction
which has never been reported for TiO2/PPy system.
PB  - Faculty of Technology, University of Novi Sad, Serbia
C3  - 15th ECerS Conference for Young Scientists in Ceramics, Novi Sad, Serbia
T1  - Photocatalytic degradation of Reactive Orange 16 dye using TiO2/PPy nanocomposites under simulated solar light
SP  - 87
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2146
ER  - 

@conference{
author = "Milojković, Natalija and Simović, Bojana and Žunić, Milan and Radovanovic, Lidija and Dapčević, Aleksandra",
year = "2023",
abstract = "It is well known that titanium dioxide is usually used as a photocatalyst due to its
nontoxicity, low cost, and stability. Conductive polymer, polypyrrole (PPy) is also
appropriate for photocatalytic application being stable and easy to synthesize. The aim of
this study was to obtain TiO2/PPy composites reaching higher photocatalytic efficiency
compared to pure TiO2. Therefore, TiO2 was synthesized by the hydrothermal route,
while PPy was obtained by the chemical oxidative polymerization method. TiO2/x% PPy
nanocomposites (x = 0, 0.5, 1, 1.5, 3, 5 wt.%) were prepared by hand-mixing of powders
in agate mortar for 30 min in order to find the optimal PPy content. Obtained materials
were characterized by XRD, FTIR, TG/DSC, FESEM, and UV-Vis methods while their
photocatalytic activity was estimated towards degradation of Reactive Orange 16 dye
(RO16). A kinetic study was performed and a detailed mechanism of RO16
photocatalytic degradation in the presence of TiO2/PPy composites was proposed based
on scavenger tests. The results showed that, despite PPy addition, TiO2 was present in
anatase form in all samples with sufficiently small crystallites (around 26 nm) and
preserved structure with no significant deviations in unit cell parameters. The band gap
energy decreased with increasing of PPy content, from 3.14 eV for pure TiO2 to 2.94 eV
for TiO2/5% PPy. All the obtained nanocomposites demonstrated higher photocatalytic
activity than pure TiO2, whereby TiO2/1% PPy nanocomposite was the most efficient by
degrading 99.6% of the dye for 105 min under simulated solar light. Therefore, the
amount of 1 wt.% should be consider as optimal amount of PPy in a composite. It is
established that the photodegradation of RO16 using TiO2/PPy nanocomposites follows
pseudo-first kinetic order. RO16 photocatalytic degradation mechanism in the presence
of TiO2/PPy nanocomposites can be well described by direct Z-scheme heterojunction
which has never been reported for TiO2/PPy system.",
publisher = "Faculty of Technology, University of Novi Sad, Serbia",
journal = "15th ECerS Conference for Young Scientists in Ceramics, Novi Sad, Serbia",
title = "Photocatalytic degradation of Reactive Orange 16 dye using TiO2/PPy nanocomposites under simulated solar light",
pages = "87",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2146"
}

Milojković, N., Simović, B., Žunić, M., Radovanovic, L.,& Dapčević, A.. (2023). Photocatalytic degradation of Reactive Orange 16 dye using TiO2/PPy nanocomposites under simulated solar light. in 15th ECerS Conference for Young Scientists in Ceramics, Novi Sad, Serbia
Faculty of Technology, University of Novi Sad, Serbia., 87.
https://hdl.handle.net/21.15107/rcub_rimsi_2146

Milojković N, Simović B, Žunić M, Radovanovic L, Dapčević A. Photocatalytic degradation of Reactive Orange 16 dye using TiO2/PPy nanocomposites under simulated solar light. in 15th ECerS Conference for Young Scientists in Ceramics, Novi Sad, Serbia. 2023;:87.
https://hdl.handle.net/21.15107/rcub_rimsi_2146 .

Milojković, Natalija, Simović, Bojana, Žunić, Milan, Radovanovic, Lidija, Dapčević, Aleksandra, "Photocatalytic degradation of Reactive Orange 16 dye using TiO2/PPy nanocomposites under simulated solar light" in 15th ECerS Conference for Young Scientists in Ceramics, Novi Sad, Serbia (2023):87,
https://hdl.handle.net/21.15107/rcub_rimsi_2146 .

TY  - CONF
AU  - Milojković, Natalija
AU  - Simović, Bojana
AU  - Žunić, Milan
AU  - Dapčević, Aleksandra
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2001
AB  - It is well known that TiO2-based Degussa P-25 is the mostly used comer-cial photocatalyst and that TiO2 exists in three crystalline modifications: tetragonal anatase (I41/amd) and rutile (P42/mnm) and orthorhombic brookite (Pbca). On heating, anatase and brookite, as metastable phases, can be transformed to rutile. The aim of this work was to investigate the effect of different dopants on anatase-rutile phase transition and thus on their photocatalytic behavior. For that matter, samples TiO2 M (M = Cu, Mn and V) having 5 at.% of dopants were prepared by 30 minutes hand-mixing of anatase and corresponding oxide (CuO, MnO2 and V2O5) powders in an agate mortar following by heat treatment at 700 °C for 3 h. The powder of pure anatase phase was also treated at same conditions. TG/DTA was used to define thermal treatment, and the obtained samples were characterized by powder XRD method in order to reach phase compositions, unit cell parameters and crystallite sizes. Since in the case of undoped anatase only 3 wt.% of rutile was formed, the presence of dopants accelerated phase transition: 26 and 76 wt.% of rutile was obtained beside anatase in TiO2 Mn and TiO2 V, respectively, while complete anatase to rutile phase transition occured in TiO2-Cu. The least rutile quantity in TiO2-Mn is related to the isovalency of Ti4+ and Мn4+ meaning that the incorporation of Мn4+ in TiO2 is not followed by the formation of new defects, which are driving force for phase transition, as in the case of TiO2 Cu. About 5 wt.% of the unreacted CuO was found in TiO2 Cu, which is almost all introduced quantity of CuO. This can be related to the fact that the ionic radius of Cu2+ for octahedral environment (0.870 Å) is larger than that of Ti4+ (0.745 Å). As a result, Cu2+ ions can hardly be incorporated in TiO2 comparing to smaller Мn4+ (0.670 Å) and V5+ (0.680 Å) although a small amount of Cu2+ surely was necessary to cause phase transition. Since no residues of initial oxides were found in TiO2 Mn and TiO2 V, it can be concluded that these metal ions were incorporated into anatase lattice. By comparing the calculated unit cell parameters of anatase mutually, the shrinkage along c-axis was revealed meaning the shortening of bond distances between М–Оapical. The photocatalytic activity of all synthesized samples will be tested since nanocrystalline samples were obtained according to determined crystallite sizes (55–90 nm).
AB  - Degussa P-25 је фотокатализатор на бази титан(IV)-оксида, који се најчешће користи у индустрији. TiO2 се јавља у три полиморфне модификације: тетрагоналним анатасу (I41/amd) и рутилу (P42/mnm) и ромбичном брукиту (Pbca). Анатас и брукит, као метастабилне фазе, приликом загревања прелазе у рутил. Циљ овог истраживања је испитивање утицаја различитих допаната на фазни прелаз анатаса у рутил као и на фотокаталитичка својства. Узорци TiO2-M (M = Cu, Mn и V), који садрже 5 at.% допанта, припремљени су термохемијском реакцијом на 700 °C током 3 h између хомогенизованих прахова анатаса и одговарајућих оксида (CuO, MnO2 и V2O5). Ради поређења, прах чистог анатаса је термички третиран под истим условима. Помоћу ТГ/ДТ анализе дефинисани су услови термичког третмана, док су добијени узорци окарактерисани рендгенском дифракцијом на поликристалном материјалу да би се одредио фазни састав, параметри јединичних ћелија и величина кристалита. У случају недопираног анатаса настало је свега 3 mas.% рутила, 26 и 76 mas.% рутила добијено је у TiO2 Mn и TiO2 V, редом, док се потпуни фазни прелаз анатас–рутил одиграо у TiO2 Cu. Ово значи да присуство допанта убрзава фазну трансформацију. Најмања количина рутила у TiO2 Mn може се објаснити изовалентним Ti4+ и Мn4+, тј. да уградња Мn4+ у TiO2 није праћена настанком нових дефеката који представљају вучну силу за одигравање фазног прелаза, као што је то случај код TiO2 Cu. Око 5 mas.% непрореаговалог CuO (готово почетна количина) заостало је у TiO2 Cu, зато што се Cu2+-јони теже уграђују у решетку TiO2 због већег радијуса Cu2+ у октаедарском окружењу (0,870 Å) од радијуса Ti4+ (0,745 Å), за разлику од мањих Мn4+ (0,670 Å) и V5+ (0,680 Å). Ипак, сигурно је мала количина Cu2+-јона била неопходна како би иницирала фазни прелаз. Како у TiO2 Mn и TiO2 V нису присутни остаци полазних оксида, може се закључити да су се ови јони метала уградили у решетку анатаса. Међусобним поређењем параметара јединичне ћелије анатаса, уочено је скраћење дуж c-осе, што указује на скраћење дужина веза М–Оапикални. Израчуната величина кристалита (55–90 nm) показала је да су сви добијени узорци нанокристални, па ће њихова фотокаталитичка својства бити испитана.
PB  - Serbian Crystallographic Society, Belgrade, Serbia
C3  - 28th Conference of the Serbian Crystallographic Society, Čačak, Serbia
T1  - Effect of dopants on anatase structure
SP  - 24
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2001
ER  - 

@conference{
author = "Milojković, Natalija and Simović, Bojana and Žunić, Milan and Dapčević, Aleksandra",
year = "2023",
abstract = "It is well known that TiO2-based Degussa P-25 is the mostly used comer-cial photocatalyst and that TiO2 exists in three crystalline modifications: tetragonal anatase (I41/amd) and rutile (P42/mnm) and orthorhombic brookite (Pbca). On heating, anatase and brookite, as metastable phases, can be transformed to rutile. The aim of this work was to investigate the effect of different dopants on anatase-rutile phase transition and thus on their photocatalytic behavior. For that matter, samples TiO2 M (M = Cu, Mn and V) having 5 at.% of dopants were prepared by 30 minutes hand-mixing of anatase and corresponding oxide (CuO, MnO2 and V2O5) powders in an agate mortar following by heat treatment at 700 °C for 3 h. The powder of pure anatase phase was also treated at same conditions. TG/DTA was used to define thermal treatment, and the obtained samples were characterized by powder XRD method in order to reach phase compositions, unit cell parameters and crystallite sizes. Since in the case of undoped anatase only 3 wt.% of rutile was formed, the presence of dopants accelerated phase transition: 26 and 76 wt.% of rutile was obtained beside anatase in TiO2 Mn and TiO2 V, respectively, while complete anatase to rutile phase transition occured in TiO2-Cu. The least rutile quantity in TiO2-Mn is related to the isovalency of Ti4+ and Мn4+ meaning that the incorporation of Мn4+ in TiO2 is not followed by the formation of new defects, which are driving force for phase transition, as in the case of TiO2 Cu. About 5 wt.% of the unreacted CuO was found in TiO2 Cu, which is almost all introduced quantity of CuO. This can be related to the fact that the ionic radius of Cu2+ for octahedral environment (0.870 Å) is larger than that of Ti4+ (0.745 Å). As a result, Cu2+ ions can hardly be incorporated in TiO2 comparing to smaller Мn4+ (0.670 Å) and V5+ (0.680 Å) although a small amount of Cu2+ surely was necessary to cause phase transition. Since no residues of initial oxides were found in TiO2 Mn and TiO2 V, it can be concluded that these metal ions were incorporated into anatase lattice. By comparing the calculated unit cell parameters of anatase mutually, the shrinkage along c-axis was revealed meaning the shortening of bond distances between М–Оapical. The photocatalytic activity of all synthesized samples will be tested since nanocrystalline samples were obtained according to determined crystallite sizes (55–90 nm)., Degussa P-25 је фотокатализатор на бази титан(IV)-оксида, који се најчешће користи у индустрији. TiO2 се јавља у три полиморфне модификације: тетрагоналним анатасу (I41/amd) и рутилу (P42/mnm) и ромбичном брукиту (Pbca). Анатас и брукит, као метастабилне фазе, приликом загревања прелазе у рутил. Циљ овог истраживања је испитивање утицаја различитих допаната на фазни прелаз анатаса у рутил као и на фотокаталитичка својства. Узорци TiO2-M (M = Cu, Mn и V), који садрже 5 at.% допанта, припремљени су термохемијском реакцијом на 700 °C током 3 h између хомогенизованих прахова анатаса и одговарајућих оксида (CuO, MnO2 и V2O5). Ради поређења, прах чистог анатаса је термички третиран под истим условима. Помоћу ТГ/ДТ анализе дефинисани су услови термичког третмана, док су добијени узорци окарактерисани рендгенском дифракцијом на поликристалном материјалу да би се одредио фазни састав, параметри јединичних ћелија и величина кристалита. У случају недопираног анатаса настало је свега 3 mas.% рутила, 26 и 76 mas.% рутила добијено је у TiO2 Mn и TiO2 V, редом, док се потпуни фазни прелаз анатас–рутил одиграо у TiO2 Cu. Ово значи да присуство допанта убрзава фазну трансформацију. Најмања количина рутила у TiO2 Mn може се објаснити изовалентним Ti4+ и Мn4+, тј. да уградња Мn4+ у TiO2 није праћена настанком нових дефеката који представљају вучну силу за одигравање фазног прелаза, као што је то случај код TiO2 Cu. Око 5 mas.% непрореаговалог CuO (готово почетна количина) заостало је у TiO2 Cu, зато што се Cu2+-јони теже уграђују у решетку TiO2 због већег радијуса Cu2+ у октаедарском окружењу (0,870 Å) од радијуса Ti4+ (0,745 Å), за разлику од мањих Мn4+ (0,670 Å) и V5+ (0,680 Å). Ипак, сигурно је мала количина Cu2+-јона била неопходна како би иницирала фазни прелаз. Како у TiO2 Mn и TiO2 V нису присутни остаци полазних оксида, може се закључити да су се ови јони метала уградили у решетку анатаса. Међусобним поређењем параметара јединичне ћелије анатаса, уочено је скраћење дуж c-осе, што указује на скраћење дужина веза М–Оапикални. Израчуната величина кристалита (55–90 nm) показала је да су сви добијени узорци нанокристални, па ће њихова фотокаталитичка својства бити испитана.",
publisher = "Serbian Crystallographic Society, Belgrade, Serbia",
journal = "28th Conference of the Serbian Crystallographic Society, Čačak, Serbia",
title = "Effect of dopants on anatase structure",
pages = "24",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2001"
}

Milojković, N., Simović, B., Žunić, M.,& Dapčević, A.. (2023). Effect of dopants on anatase structure. in 28th Conference of the Serbian Crystallographic Society, Čačak, Serbia
Serbian Crystallographic Society, Belgrade, Serbia., 24.
https://hdl.handle.net/21.15107/rcub_rimsi_2001

Milojković N, Simović B, Žunić M, Dapčević A. Effect of dopants on anatase structure. in 28th Conference of the Serbian Crystallographic Society, Čačak, Serbia. 2023;:24.
https://hdl.handle.net/21.15107/rcub_rimsi_2001 .

Milojković, Natalija, Simović, Bojana, Žunić, Milan, Dapčević, Aleksandra, "Effect of dopants on anatase structure" in 28th Conference of the Serbian Crystallographic Society, Čačak, Serbia (2023):24,
https://hdl.handle.net/21.15107/rcub_rimsi_2001 .

TY  - CONF
AU  - Simović, Bojana
AU  - Radovanovic, Zeljko
AU  - Branković, Goran
AU  - Dapčević, Aleksandra
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1991
AB  - In this work, the decoration of noble metal nanoparticles on a semiconductor
surface was used as a strategy to reach strong visible light absorption and efficient
electron-hole separation to enhance the photocatalytic activity of ZnO.
The Ag-modified ZnO nanopowders were obtained by the green synthesis. Zinc
acetate dihydrate with different silver nitrate content (0, 0.75, 1.5 and 3 mol%) was
dissolved in ethylene glycol in the presence of chitosan. The obtained mixtures in
the form of gel were heated at 150 °C for 2 h and subsequently calcined at 400 °C
for 1 h. The obtained samples were characterized by XRPD, FESEM, HRTEM, and
UV-vis techniques while the photocatalytic efficiency was tested by monitoring the
degradation of textile dyes Reactive Orange 16 (RO16), Acid Green 25 (AG25),
Mordant Blue 9 (MB9), and Ethyl Violet (EV) then compared with the commercial
ZnO nanopowder.
The results showed that the Ag/ZnO samples consisted of ZnO nanoparticles
with an average crystallite size of about 25 nm and Ag (20–30 nm) distributed on
the surface of ZnO. The uniformity in size and nearly spherical shape of ZnO
nanoparticles, forming various forms of agglomerates, were observed. Compared to
both, the unmodified and commercial ZnO, all the prepared Ag/ZnO composites
showed a broad band in the visible region at 500 nm, resulting in a narrowing of the
band gap. This band confirms the surface plasmon resonance of the metallic Ag
nanoparticles, since they can absorb visible light and activate the photocatalyst in
the visible spectrum.
All the obtained nanopowders showed higher adsorption power and
photocatalytic activity in the degradation of RO16 dye than the commercial ZnO.
The powder with 1.5 mol% of Ag had the highest photocatalytic efficiency as a
consequence of smaller Ag particles and their good distribution, as well as the
narrowest band gap. This means that the photocatalytic activity does not depend on
the Ag content only and that the size and distribution of the metal particles play an
important role. Since the ZnO with 1.5 mol% of Ag demonstrated the best
photocatalytic activity, the same sample was tested for diverse dyes and the high
photocatalytic efficiency was also confirmed by testing on AG25, MB9 and EV
dyes.
PB  - Institut za multidisciplinarna istraživanja, Belgrade, Serbia
C3  - 7th Conference of the Serbian Society for Ceramic Materials, Belgrade, Serbia
T1  - Ag/ZnO NANOCOMPOSITES FOR PHOTOCATALYTIC APPLICATION
SP  - 106
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_1991
ER  - 

@conference{
author = "Simović, Bojana and Radovanovic, Zeljko and Branković, Goran and Dapčević, Aleksandra",
year = "2023",
abstract = "In this work, the decoration of noble metal nanoparticles on a semiconductor
surface was used as a strategy to reach strong visible light absorption and efficient
electron-hole separation to enhance the photocatalytic activity of ZnO.
The Ag-modified ZnO nanopowders were obtained by the green synthesis. Zinc
acetate dihydrate with different silver nitrate content (0, 0.75, 1.5 and 3 mol%) was
dissolved in ethylene glycol in the presence of chitosan. The obtained mixtures in
the form of gel were heated at 150 °C for 2 h and subsequently calcined at 400 °C
for 1 h. The obtained samples were characterized by XRPD, FESEM, HRTEM, and
UV-vis techniques while the photocatalytic efficiency was tested by monitoring the
degradation of textile dyes Reactive Orange 16 (RO16), Acid Green 25 (AG25),
Mordant Blue 9 (MB9), and Ethyl Violet (EV) then compared with the commercial
ZnO nanopowder.
The results showed that the Ag/ZnO samples consisted of ZnO nanoparticles
with an average crystallite size of about 25 nm and Ag (20–30 nm) distributed on
the surface of ZnO. The uniformity in size and nearly spherical shape of ZnO
nanoparticles, forming various forms of agglomerates, were observed. Compared to
both, the unmodified and commercial ZnO, all the prepared Ag/ZnO composites
showed a broad band in the visible region at 500 nm, resulting in a narrowing of the
band gap. This band confirms the surface plasmon resonance of the metallic Ag
nanoparticles, since they can absorb visible light and activate the photocatalyst in
the visible spectrum.
All the obtained nanopowders showed higher adsorption power and
photocatalytic activity in the degradation of RO16 dye than the commercial ZnO.
The powder with 1.5 mol% of Ag had the highest photocatalytic efficiency as a
consequence of smaller Ag particles and their good distribution, as well as the
narrowest band gap. This means that the photocatalytic activity does not depend on
the Ag content only and that the size and distribution of the metal particles play an
important role. Since the ZnO with 1.5 mol% of Ag demonstrated the best
photocatalytic activity, the same sample was tested for diverse dyes and the high
photocatalytic efficiency was also confirmed by testing on AG25, MB9 and EV
dyes.",
publisher = "Institut za multidisciplinarna istraživanja, Belgrade, Serbia",
journal = "7th Conference of the Serbian Society for Ceramic Materials, Belgrade, Serbia",
title = "Ag/ZnO NANOCOMPOSITES FOR PHOTOCATALYTIC APPLICATION",
pages = "106",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_1991"
}

Simović, B., Radovanovic, Z., Branković, G.,& Dapčević, A.. (2023). Ag/ZnO NANOCOMPOSITES FOR PHOTOCATALYTIC APPLICATION. in 7th Conference of the Serbian Society for Ceramic Materials, Belgrade, Serbia
Institut za multidisciplinarna istraživanja, Belgrade, Serbia., 106.
https://hdl.handle.net/21.15107/rcub_rimsi_1991

Simović B, Radovanovic Z, Branković G, Dapčević A. Ag/ZnO NANOCOMPOSITES FOR PHOTOCATALYTIC APPLICATION. in 7th Conference of the Serbian Society for Ceramic Materials, Belgrade, Serbia. 2023;:106.
https://hdl.handle.net/21.15107/rcub_rimsi_1991 .

Simović, Bojana, Radovanovic, Zeljko, Branković, Goran, Dapčević, Aleksandra, "Ag/ZnO NANOCOMPOSITES FOR PHOTOCATALYTIC APPLICATION" in 7th Conference of the Serbian Society for Ceramic Materials, Belgrade, Serbia (2023):106,
https://hdl.handle.net/21.15107/rcub_rimsi_1991 .

TY  - CONF
AU  - Milojković, Natalija
AU  - Simović, Bojana
AU  - Žunić, Milan
AU  - Radovanovic, Lidija
AU  - Dapčević, Aleksandra
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1988
AB  - Titan(IV)-oksid je jedan od najčešće korišćenih fotokatalizatora, dok za polipirol (PPy)
postoje potvrde da je pogodan za ovu primenu. Cilj ovog rada bio je dobijanje kompozita
TiO2/PPy sa boljom fotokatalitičkom aktivnosti u odnosu na TiO2. Kako bi se optimizovao
sadržaj PPy u kompozitu, sintetisani su uzorci TiO2/x%PPy (x = 0, 0,5, 1, 1,5, 3, 5 mas.%),
koji su okarakterisani TG/DTA, XRD, FTIR, FESEM i UV-Vis metodama, dok su njihova
fotokatalitička svojstva ispitana kroz razgradnju tekstilne boje RO16. Nanokristalni TiO2 je
dobijen u obliku anatasa veličine kristalita oko 2 nm, dok su izračunati parametri
jedinične ćelije potvrdili da je kristalna struktura anatasa ostala nepromenjena nakon
dodatka PPy. Gotovo svi uzorci (izuzev TiO2/3%PPy) su fotokatalitički aktivniji od TiO2,
dok je TiO2/1%PPy pokazao najizraženiju fotokatalitičku aktivnost razgradivši 9 % boje
nakon 75 min.
AB  - Titanium(IV) oxide is one of the most used photocatalysts while polypyrrole (PPy) is a
promising material for photocatalytic application. The aim of this work was to obtain
TiO2/PPy composites exhibiting higher photocatalytic activity than TiO2. In order to
determine the optimal PPy content in a composite, TiO2/x%PPy (x = 0, 0.5, 1, 1.5, 3, 5
wt.%) samples were synthesized and characterized by TG/DTA, XRD, FTIR, FESEM and
UV-Vis methods, while the photocatalytic behavior was examined towards the degradation
of the textile dye RO16. Nanocrystalline TiO2 was obtained in anatase form with crystallite
size around 26 nm and preserved anatase crystal structure despite the addition of PPy
according to the calculated unit cell parameters. Almost all samples (except TiO2/3%PPy)
showed better photocatalytic activity than TiO2 while the best photocatalytic activity was
demonstrated by TiO2/1%PPy which degraded 98 % of the dye after 75 min.
PB  - Srpsko hemijsko društvo, Beograd
C3  - 59th Meeting of the Serbian Chemical Society, Novi Sad, Serbia, Book of Abstracts
T1  - TiO2/PPy nanocomposites for photocatalytic application
SP  - 144
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_1988
ER  - 

@conference{
author = "Milojković, Natalija and Simović, Bojana and Žunić, Milan and Radovanovic, Lidija and Dapčević, Aleksandra",
year = "2023",
abstract = "Titan(IV)-oksid je jedan od najčešće korišćenih fotokatalizatora, dok za polipirol (PPy)
postoje potvrde da je pogodan za ovu primenu. Cilj ovog rada bio je dobijanje kompozita
TiO2/PPy sa boljom fotokatalitičkom aktivnosti u odnosu na TiO2. Kako bi se optimizovao
sadržaj PPy u kompozitu, sintetisani su uzorci TiO2/x%PPy (x = 0, 0,5, 1, 1,5, 3, 5 mas.%),
koji su okarakterisani TG/DTA, XRD, FTIR, FESEM i UV-Vis metodama, dok su njihova
fotokatalitička svojstva ispitana kroz razgradnju tekstilne boje RO16. Nanokristalni TiO2 je
dobijen u obliku anatasa veličine kristalita oko 2 nm, dok su izračunati parametri
jedinične ćelije potvrdili da je kristalna struktura anatasa ostala nepromenjena nakon
dodatka PPy. Gotovo svi uzorci (izuzev TiO2/3%PPy) su fotokatalitički aktivniji od TiO2,
dok je TiO2/1%PPy pokazao najizraženiju fotokatalitičku aktivnost razgradivši 9 % boje
nakon 75 min., Titanium(IV) oxide is one of the most used photocatalysts while polypyrrole (PPy) is a
promising material for photocatalytic application. The aim of this work was to obtain
TiO2/PPy composites exhibiting higher photocatalytic activity than TiO2. In order to
determine the optimal PPy content in a composite, TiO2/x%PPy (x = 0, 0.5, 1, 1.5, 3, 5
wt.%) samples were synthesized and characterized by TG/DTA, XRD, FTIR, FESEM and
UV-Vis methods, while the photocatalytic behavior was examined towards the degradation
of the textile dye RO16. Nanocrystalline TiO2 was obtained in anatase form with crystallite
size around 26 nm and preserved anatase crystal structure despite the addition of PPy
according to the calculated unit cell parameters. Almost all samples (except TiO2/3%PPy)
showed better photocatalytic activity than TiO2 while the best photocatalytic activity was
demonstrated by TiO2/1%PPy which degraded 98 % of the dye after 75 min.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "59th Meeting of the Serbian Chemical Society, Novi Sad, Serbia, Book of Abstracts",
title = "TiO2/PPy nanocomposites for photocatalytic application",
pages = "144",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_1988"
}

Milojković, N., Simović, B., Žunić, M., Radovanovic, L.,& Dapčević, A.. (2023). TiO2/PPy nanocomposites for photocatalytic application. in 59th Meeting of the Serbian Chemical Society, Novi Sad, Serbia, Book of Abstracts
Srpsko hemijsko društvo, Beograd., 144.
https://hdl.handle.net/21.15107/rcub_rimsi_1988

Milojković N, Simović B, Žunić M, Radovanovic L, Dapčević A. TiO2/PPy nanocomposites for photocatalytic application. in 59th Meeting of the Serbian Chemical Society, Novi Sad, Serbia, Book of Abstracts. 2023;:144.
https://hdl.handle.net/21.15107/rcub_rimsi_1988 .

Milojković, Natalija, Simović, Bojana, Žunić, Milan, Radovanovic, Lidija, Dapčević, Aleksandra, "TiO2/PPy nanocomposites for photocatalytic application" in 59th Meeting of the Serbian Chemical Society, Novi Sad, Serbia, Book of Abstracts (2023):144,
https://hdl.handle.net/21.15107/rcub_rimsi_1988 .

TY  - JOUR
AU  - Padilla, Luis
AU  - Stojilovic, Nenad
AU  - Grujić-Brojčin, Mirjana
AU  - Šćepanović, Maja
AU  - Tomic, Natasa
AU  - Simović, Bojana
AU  - Potratz, Gregory
AU  - Gopalakrishnan, Gokul
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1982
AB  - Non-woven fibers were produced by sol-gel and electrospinning methods, from a solution containing cerium nitrate, zinc acetate, titanium isopropoxide, polyvinylpyrrolidone, acetic acid, ethanol, and water. The fibers were calcined at various temperatures ranging from 300 to 900 °C and were characterized using Scanning Electron Microscopy (SEM), X-Ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area analysis, Energy Dispersive X-ray (EDX), Raman spectroscopy, Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Structural characterization revealed the fluorite nanocrystalline phase of ceria (CeO2) at all temperatures, the wurtzite zinc oxide (ZnO) phase in the 300–500 °C range, and a variety of zinc titanate phases (such as ZnTiO3, Zn2Ti3O8 and Zn2TiO4) at higher temperatures. Titania (TiO2) phases were not observed following calcination up to 900 °C. The average ceria nanocrystallite size increases with calcination temperature, as revealed by XRD and confirmed by the Phonon Confinement Model (PCM) of Raman spectra. The opposite trend is observed for the BET specific surface area of the nanofibers, where this value decreases with calcination temperatures above 400 °C. These nanofibers containing ceria and zinc titanates are potential candidates for photocatalytic applications.
PB  - Elsevier Ltd
T2  - Journal of Physics and Chemistry of Solids
T1  - Composite nanofibers electrospun from cerium, titanium, and zinc precursors
SP  - 111410
VL  - 179
DO  - 10.1016/j.jpcs.2023.111410
ER  - 

@article{
author = "Padilla, Luis and Stojilovic, Nenad and Grujić-Brojčin, Mirjana and Šćepanović, Maja and Tomic, Natasa and Simović, Bojana and Potratz, Gregory and Gopalakrishnan, Gokul",
year = "2023",
abstract = "Non-woven fibers were produced by sol-gel and electrospinning methods, from a solution containing cerium nitrate, zinc acetate, titanium isopropoxide, polyvinylpyrrolidone, acetic acid, ethanol, and water. The fibers were calcined at various temperatures ranging from 300 to 900 °C and were characterized using Scanning Electron Microscopy (SEM), X-Ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area analysis, Energy Dispersive X-ray (EDX), Raman spectroscopy, Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Structural characterization revealed the fluorite nanocrystalline phase of ceria (CeO2) at all temperatures, the wurtzite zinc oxide (ZnO) phase in the 300–500 °C range, and a variety of zinc titanate phases (such as ZnTiO3, Zn2Ti3O8 and Zn2TiO4) at higher temperatures. Titania (TiO2) phases were not observed following calcination up to 900 °C. The average ceria nanocrystallite size increases with calcination temperature, as revealed by XRD and confirmed by the Phonon Confinement Model (PCM) of Raman spectra. The opposite trend is observed for the BET specific surface area of the nanofibers, where this value decreases with calcination temperatures above 400 °C. These nanofibers containing ceria and zinc titanates are potential candidates for photocatalytic applications.",
publisher = "Elsevier Ltd",
journal = "Journal of Physics and Chemistry of Solids",
title = "Composite nanofibers electrospun from cerium, titanium, and zinc precursors",
pages = "111410",
volume = "179",
doi = "10.1016/j.jpcs.2023.111410"
}

Padilla, L., Stojilovic, N., Grujić-Brojčin, M., Šćepanović, M., Tomic, N., Simović, B., Potratz, G.,& Gopalakrishnan, G.. (2023). Composite nanofibers electrospun from cerium, titanium, and zinc precursors. in Journal of Physics and Chemistry of Solids
Elsevier Ltd., 179, 111410.
https://doi.org/10.1016/j.jpcs.2023.111410

Padilla L, Stojilovic N, Grujić-Brojčin M, Šćepanović M, Tomic N, Simović B, Potratz G, Gopalakrishnan G. Composite nanofibers electrospun from cerium, titanium, and zinc precursors. in Journal of Physics and Chemistry of Solids. 2023;179:111410.
doi:10.1016/j.jpcs.2023.111410 .

Padilla, Luis, Stojilovic, Nenad, Grujić-Brojčin, Mirjana, Šćepanović, Maja, Tomic, Natasa, Simović, Bojana, Potratz, Gregory, Gopalakrishnan, Gokul, "Composite nanofibers electrospun from cerium, titanium, and zinc precursors" in Journal of Physics and Chemistry of Solids, 179 (2023):111410,
https://doi.org/10.1016/j.jpcs.2023.111410 . .

TY  - JOUR
AU  - Simović, Bojana
AU  - Radovanovic, Zeljko
AU  - Branković, Goran
AU  - Dapčević, Aleksandra
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1981
AB  - In this work, in order to improve the photocatalytic efficiency of ZnO, the optimal CeO2 content in ZnO powders was determined by varying the quantity of CeO2 from 0 to 10 mol%. The structural, microstructural, optical, textural, and photocatalytic properties of the hydrothermally obtained ZnO and CeO2/ZnO nanocomposites have been investigated by using the XRPD, FESEM, HRTEM/SAED, BET, and UV–Vis techniques. Detailed characterization revealed that CeO2, having spherical nanodots of about 5 nm with a large surface area, was distributed onto the ZnO surface, whose crystallites displayed a bimodal distribution, from nano-to micro-crystals. The morphology of ZnO is a combination of nanograins and microrods that further makes a 3-D tie-like morphology. The nanocomposite containing 5 mol% of CeO2 showed about 30% better photocatalytic efficiency in the degradation of Reactive Orange 16 dye compared to other samples under simulated solar radiation. In addition, the kinetics and mechanism of photocatalytic degradation were also proposed based on the photocatalytic activity and scavenger tests.
PB  - Elsevier Ltd
T2  - Materials Science in Semiconductor Processing
T1  - Hydrothermally synthesized CeO2/ZnO nanocomposite photocatalysts for the enhanced degradation of Reactive Orange 16 dye
SP  - 107542
VL  - 162
DO  - 10.1016/j.mssp.2023.107542
ER  - 

@article{
author = "Simović, Bojana and Radovanovic, Zeljko and Branković, Goran and Dapčević, Aleksandra",
year = "2023",
abstract = "In this work, in order to improve the photocatalytic efficiency of ZnO, the optimal CeO2 content in ZnO powders was determined by varying the quantity of CeO2 from 0 to 10 mol%. The structural, microstructural, optical, textural, and photocatalytic properties of the hydrothermally obtained ZnO and CeO2/ZnO nanocomposites have been investigated by using the XRPD, FESEM, HRTEM/SAED, BET, and UV–Vis techniques. Detailed characterization revealed that CeO2, having spherical nanodots of about 5 nm with a large surface area, was distributed onto the ZnO surface, whose crystallites displayed a bimodal distribution, from nano-to micro-crystals. The morphology of ZnO is a combination of nanograins and microrods that further makes a 3-D tie-like morphology. The nanocomposite containing 5 mol% of CeO2 showed about 30% better photocatalytic efficiency in the degradation of Reactive Orange 16 dye compared to other samples under simulated solar radiation. In addition, the kinetics and mechanism of photocatalytic degradation were also proposed based on the photocatalytic activity and scavenger tests.",
publisher = "Elsevier Ltd",
journal = "Materials Science in Semiconductor Processing",
title = "Hydrothermally synthesized CeO2/ZnO nanocomposite photocatalysts for the enhanced degradation of Reactive Orange 16 dye",
pages = "107542",
volume = "162",
doi = "10.1016/j.mssp.2023.107542"
}

Simović, B., Radovanovic, Z., Branković, G.,& Dapčević, A.. (2023). Hydrothermally synthesized CeO2/ZnO nanocomposite photocatalysts for the enhanced degradation of Reactive Orange 16 dye. in Materials Science in Semiconductor Processing
Elsevier Ltd., 162, 107542.
https://doi.org/10.1016/j.mssp.2023.107542

Simović B, Radovanovic Z, Branković G, Dapčević A. Hydrothermally synthesized CeO2/ZnO nanocomposite photocatalysts for the enhanced degradation of Reactive Orange 16 dye. in Materials Science in Semiconductor Processing. 2023;162:107542.
doi:10.1016/j.mssp.2023.107542 .

Simović, Bojana, Radovanovic, Zeljko, Branković, Goran, Dapčević, Aleksandra, "Hydrothermally synthesized CeO2/ZnO nanocomposite photocatalysts for the enhanced degradation of Reactive Orange 16 dye" in Materials Science in Semiconductor Processing, 162 (2023):107542,
https://doi.org/10.1016/j.mssp.2023.107542 . .

TY  - JOUR
AU  - Radovanović, Lidija
AU  - Radovanović, Zeljko
AU  - Simović, Bojana
AU  - Vasić (prev. Arsenović), Milica
AU  - Balanč, Bojana
AU  - Dapčević, Aleksandra
AU  - Dramićanin, Miroslav
AU  - Rogan, Jelena
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1891
AB  - A biphasic [Mn(dipya)(H2O)4](tpht)/{[Zn(dipya)(tpht)]•H2O}n complex material, I, (dipya = 2,2’-dipyridylamine, tpht2- = dianion of terephthalatic acid) was synthesized by ligand exchange reaction and characterized by XRPD and FTIR spectroscopy. A ZnO/ZnMn2O4 composite, II, has been prepared via thermal decomposition of precursor I in an air atmosphere at 450°C. XRPD, FTIR and FESEM analyses of II revealed the simultaneous presence of spherical nanoparticles of wurtzite ZnO and elongated nanoparticles of spinel ZnMn2O4. The specific surface area of II was determined by the BET method, whereas the volume and average size of the mesopores were calculated in accordance with the BJH method. The measurements of the mean size, polydispersity index and zeta potential showed colloidal instability of II. Two band gap values of 2.4 and 3.3 eV were determined using UV-Vis diffuse reflectance spectroscopy, while the measurements of photoluminescence revealed that II is active in the blue region of the visible spectrum. Testing of composite II as a pigmentary material showed that it can be used for the colouring of a ceramic glaze.
AB  - Двофазни [Mn(dipya)(H2O)4](tpht)/{[Zn(dipya)(tpht)]·H2O}n комплексни материјал, I,
(dipya = 2,2’-дипиридиламин, tpht2– = дианјон 1,4-бензендикарбоксилне киселине) синтетисан је реакцијом измене лиганада и окарактерисан XRPD мeтoдом и FTIR спектроскопијом. Композит ZnO/ZnMn2O4, II, добијен је термичком разградњом прекурcopa I у атмосфери ваздуха на 450 °C. XRPD мeтoдом, FTIR спектроскопијом и FESEM микроскопијом композита II утврђено је истовремено присуство сферних наночестица ZnO
вирцитне структуре и издужених наночестица ZnMn2O4 са структуром спинела. Специфична површина II одређена је BET методом, док су запремина и просечна величина мезопора израчунати у складу са BJH методом. Средња величина, индекс полидисперзије и цета потенцијал измерени су фотонском корелационом спектроскопијом и електрофоретским расејањем светлости и показали су нестабилност композита II. Вредности
ширине забрањене зоне 2,4 и 3,3 eV одређене су UV-Vis дифузно-рефлексионом спектроскопијом, док су мерења фотолуминесценције показала да је II активан у плавој области видљивог дела спектра. Испитивање композита II као пигментног материјала показало је да се може користити за бојење керамичке глазуре.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Structure and properties of ZnO/ZnMn2O4 composite obtained by thermal decomposition of terephthalate precursor
EP  - 325
IS  - 3
SP  - 313
VL  - 88
DO  - 10.2298/JSC221102090R
ER  - 

@article{
author = "Radovanović, Lidija and Radovanović, Zeljko and Simović, Bojana and Vasić (prev. Arsenović), Milica and Balanč, Bojana and Dapčević, Aleksandra and Dramićanin, Miroslav and Rogan, Jelena",
year = "2023",
abstract = "A biphasic [Mn(dipya)(H2O)4](tpht)/{[Zn(dipya)(tpht)]•H2O}n complex material, I, (dipya = 2,2’-dipyridylamine, tpht2- = dianion of terephthalatic acid) was synthesized by ligand exchange reaction and characterized by XRPD and FTIR spectroscopy. A ZnO/ZnMn2O4 composite, II, has been prepared via thermal decomposition of precursor I in an air atmosphere at 450°C. XRPD, FTIR and FESEM analyses of II revealed the simultaneous presence of spherical nanoparticles of wurtzite ZnO and elongated nanoparticles of spinel ZnMn2O4. The specific surface area of II was determined by the BET method, whereas the volume and average size of the mesopores were calculated in accordance with the BJH method. The measurements of the mean size, polydispersity index and zeta potential showed colloidal instability of II. Two band gap values of 2.4 and 3.3 eV were determined using UV-Vis diffuse reflectance spectroscopy, while the measurements of photoluminescence revealed that II is active in the blue region of the visible spectrum. Testing of composite II as a pigmentary material showed that it can be used for the colouring of a ceramic glaze., Двофазни [Mn(dipya)(H2O)4](tpht)/{[Zn(dipya)(tpht)]·H2O}n комплексни материјал, I,
(dipya = 2,2’-дипиридиламин, tpht2– = дианјон 1,4-бензендикарбоксилне киселине) синтетисан је реакцијом измене лиганада и окарактерисан XRPD мeтoдом и FTIR спектроскопијом. Композит ZnO/ZnMn2O4, II, добијен је термичком разградњом прекурcopa I у атмосфери ваздуха на 450 °C. XRPD мeтoдом, FTIR спектроскопијом и FESEM микроскопијом композита II утврђено је истовремено присуство сферних наночестица ZnO
вирцитне структуре и издужених наночестица ZnMn2O4 са структуром спинела. Специфична површина II одређена је BET методом, док су запремина и просечна величина мезопора израчунати у складу са BJH методом. Средња величина, индекс полидисперзије и цета потенцијал измерени су фотонском корелационом спектроскопијом и електрофоретским расејањем светлости и показали су нестабилност композита II. Вредности
ширине забрањене зоне 2,4 и 3,3 eV одређене су UV-Vis дифузно-рефлексионом спектроскопијом, док су мерења фотолуминесценције показала да је II активан у плавој области видљивог дела спектра. Испитивање композита II као пигментног материјала показало је да се може користити за бојење керамичке глазуре.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Structure and properties of ZnO/ZnMn2O4 composite obtained by thermal decomposition of terephthalate precursor",
pages = "325-313",
number = "3",
volume = "88",
doi = "10.2298/JSC221102090R"
}

Radovanović, L., Radovanović, Z., Simović, B., Vasić (prev. Arsenović), M., Balanč, B., Dapčević, A., Dramićanin, M.,& Rogan, J.. (2023). Structure and properties of ZnO/ZnMn2O4 composite obtained by thermal decomposition of terephthalate precursor. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 88(3), 313-325.
https://doi.org/10.2298/JSC221102090R

Radovanović L, Radovanović Z, Simović B, Vasić (prev. Arsenović) M, Balanč B, Dapčević A, Dramićanin M, Rogan J. Structure and properties of ZnO/ZnMn2O4 composite obtained by thermal decomposition of terephthalate precursor. in Journal of the Serbian Chemical Society. 2023;88(3):313-325.
doi:10.2298/JSC221102090R .

Radovanović, Lidija, Radovanović, Zeljko, Simović, Bojana, Vasić (prev. Arsenović), Milica, Balanč, Bojana, Dapčević, Aleksandra, Dramićanin, Miroslav, Rogan, Jelena, "Structure and properties of ZnO/ZnMn2O4 composite obtained by thermal decomposition of terephthalate precursor" in Journal of the Serbian Chemical Society, 88, no. 3 (2023):313-325,
https://doi.org/10.2298/JSC221102090R . .

TY  - CONF
AU  - Radovanovic, Lidija
AU  - Radovanovic, Zeljko
AU  - Kremenovic, Aleksandar
AU  - Simović, Bojana
AU  - Vasić (prev. Arsenović), Milica
AU  - Rogan, Jelena
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1998
AB  - In recent years, thermal decomposition studies of transition metal complexes with benzenepolycarboxylate ligands have become an area of a great importance due to the possibility of obtaining useful metal oxides with desirable electrical, magnetic and catalytic properties [1]. As a
contrast to conventional methods for the preparation of metal oxides, such as hydrothermal or sol–
gel treatment, thermolysis is faster, more efficient and environmentally friendly. Mn(II)–dipya
(dipya = 2,2’-dipyridylamine) complex with tetraanion of 1,2,4,5-benzenetetracarboxylic
(pyromellitic, H4pyr) acid, [Mn2(dipya)2(pyr)(H2O)2], has been prepared and characterized by
elemental, spectral and microscopy analyses. Direct thermolysis of the complex up to 1200 °C in an air atmosphere yielded spinel Mn3O4 oxide material. The obtained Mn3O4 has been characterized for its structural, spectroscopic, morphological and optical properties. The possibilities of using this oxide as photocatalyst or co-photocatalyst for removing textile organic dyes, as well as inorganic pigmentary material, were also investigated and discussed.
PB  - University in Banjaluka, Faculty of Technology
C3  - XIV CONFERENCE OF CHEMISTS, TECHNOLOGISTS AND ENVIRONMENTALISTS OF REPUBLIC OF SRPSKA, ACADEMY OF SCIENCES AND ARTS OF THE REPUBLIC OF SRPSKA, BANJA LUKA
T1  - MANGANESE-PYROMELLITATE COMPLEX AS A PRECURSOR FOR PREPARATION OF SPINEL Mn3O4
SP  - 192
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_1998
ER  - 

@conference{
author = "Radovanovic, Lidija and Radovanovic, Zeljko and Kremenovic, Aleksandar and Simović, Bojana and Vasić (prev. Arsenović), Milica and Rogan, Jelena",
year = "2022",
abstract = "In recent years, thermal decomposition studies of transition metal complexes with benzenepolycarboxylate ligands have become an area of a great importance due to the possibility of obtaining useful metal oxides with desirable electrical, magnetic and catalytic properties [1]. As a
contrast to conventional methods for the preparation of metal oxides, such as hydrothermal or sol–
gel treatment, thermolysis is faster, more efficient and environmentally friendly. Mn(II)–dipya
(dipya = 2,2’-dipyridylamine) complex with tetraanion of 1,2,4,5-benzenetetracarboxylic
(pyromellitic, H4pyr) acid, [Mn2(dipya)2(pyr)(H2O)2], has been prepared and characterized by
elemental, spectral and microscopy analyses. Direct thermolysis of the complex up to 1200 °C in an air atmosphere yielded spinel Mn3O4 oxide material. The obtained Mn3O4 has been characterized for its structural, spectroscopic, morphological and optical properties. The possibilities of using this oxide as photocatalyst or co-photocatalyst for removing textile organic dyes, as well as inorganic pigmentary material, were also investigated and discussed.",
publisher = "University in Banjaluka, Faculty of Technology",
journal = "XIV CONFERENCE OF CHEMISTS, TECHNOLOGISTS AND ENVIRONMENTALISTS OF REPUBLIC OF SRPSKA, ACADEMY OF SCIENCES AND ARTS OF THE REPUBLIC OF SRPSKA, BANJA LUKA",
title = "MANGANESE-PYROMELLITATE COMPLEX AS A PRECURSOR FOR PREPARATION OF SPINEL Mn3O4",
pages = "192",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_1998"
}

Radovanovic, L., Radovanovic, Z., Kremenovic, A., Simović, B., Vasić (prev. Arsenović), M.,& Rogan, J.. (2022). MANGANESE-PYROMELLITATE COMPLEX AS A PRECURSOR FOR PREPARATION OF SPINEL Mn3O4. in XIV CONFERENCE OF CHEMISTS, TECHNOLOGISTS AND ENVIRONMENTALISTS OF REPUBLIC OF SRPSKA, ACADEMY OF SCIENCES AND ARTS OF THE REPUBLIC OF SRPSKA, BANJA LUKA
University in Banjaluka, Faculty of Technology., 192.
https://hdl.handle.net/21.15107/rcub_rimsi_1998

Radovanovic L, Radovanovic Z, Kremenovic A, Simović B, Vasić (prev. Arsenović) M, Rogan J. MANGANESE-PYROMELLITATE COMPLEX AS A PRECURSOR FOR PREPARATION OF SPINEL Mn3O4. in XIV CONFERENCE OF CHEMISTS, TECHNOLOGISTS AND ENVIRONMENTALISTS OF REPUBLIC OF SRPSKA, ACADEMY OF SCIENCES AND ARTS OF THE REPUBLIC OF SRPSKA, BANJA LUKA. 2022;:192.
https://hdl.handle.net/21.15107/rcub_rimsi_1998 .

Radovanovic, Lidija, Radovanovic, Zeljko, Kremenovic, Aleksandar, Simović, Bojana, Vasić (prev. Arsenović), Milica, Rogan, Jelena, "MANGANESE-PYROMELLITATE COMPLEX AS A PRECURSOR FOR PREPARATION OF SPINEL Mn3O4" in XIV CONFERENCE OF CHEMISTS, TECHNOLOGISTS AND ENVIRONMENTALISTS OF REPUBLIC OF SRPSKA, ACADEMY OF SCIENCES AND ARTS OF THE REPUBLIC OF SRPSKA, BANJA LUKA (2022):192,
https://hdl.handle.net/21.15107/rcub_rimsi_1998 .

TY  - CONF
AU  - Simović, Bojana
AU  - Milojković, Natalija
AU  - Žunić, Milan
AU  - Branković, Goran
AU  - Dapčević, Aleksandra
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1990
AB  - The structural, microstructural, optical and photocatalytic properties of
hydrothermally obtained single-phase ZnO and CeO2@ZnO nanocomposites have
been investigated by the XRPD, FESEM, HRTEM/SAED and UV-vis techniques. In
order to improve the photocatalytic efficiency of ZnO, the optimal CeO2 content in
ZnO powders was determined by varying the quantity of CeO2 from 0 to 10 mol%.
The results showed that CeO2 with spherical crystallites of about 5 nm was
distributed onto the ZnO surface, whose crystallites displayed a bimodal
distribution, from nano- to microcrystallites. The morphology of ZnO particles
varied from elongated nanograins to microrods that further formed a 3-D tie-like
morphology which was disrupted by CeO2 adding. By degrading 90% of RO16 dye
in 180 minutes, the composite containing 5 mol% of CeO2 showed approximately
for 30% better photocatalytic efficiency comparing to other samples, although all the
obtained powders have similar structural, microstructural and optical characteristics.
This is obviously the optimal ratio of these two phases, in which synergy of CeO2
adsorption and ZnO photocatalytic effect reaches its maximum due to reduced
recombination rate and improved adsorption. The kinetic of RO16 degradation could
be described by a pseudo-first order model.
PB  - Institut za multidisciplinarna istraživanja, Belgrade, Serbia
C3  - 6rd Conference of the Serbian Society for Ceramic Materials, Belgrade, Serbia,
T1  - Improved photocatalytic degradation of RO16 dye using hydrothermally synthesized CeO2@ZnO nanocomposite
SP  - 54
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_1990
ER  - 

@conference{
author = "Simović, Bojana and Milojković, Natalija and Žunić, Milan and Branković, Goran and Dapčević, Aleksandra",
year = "2022",
abstract = "The structural, microstructural, optical and photocatalytic properties of
hydrothermally obtained single-phase ZnO and CeO2@ZnO nanocomposites have
been investigated by the XRPD, FESEM, HRTEM/SAED and UV-vis techniques. In
order to improve the photocatalytic efficiency of ZnO, the optimal CeO2 content in
ZnO powders was determined by varying the quantity of CeO2 from 0 to 10 mol%.
The results showed that CeO2 with spherical crystallites of about 5 nm was
distributed onto the ZnO surface, whose crystallites displayed a bimodal
distribution, from nano- to microcrystallites. The morphology of ZnO particles
varied from elongated nanograins to microrods that further formed a 3-D tie-like
morphology which was disrupted by CeO2 adding. By degrading 90% of RO16 dye
in 180 minutes, the composite containing 5 mol% of CeO2 showed approximately
for 30% better photocatalytic efficiency comparing to other samples, although all the
obtained powders have similar structural, microstructural and optical characteristics.
This is obviously the optimal ratio of these two phases, in which synergy of CeO2
adsorption and ZnO photocatalytic effect reaches its maximum due to reduced
recombination rate and improved adsorption. The kinetic of RO16 degradation could
be described by a pseudo-first order model.",
publisher = "Institut za multidisciplinarna istraživanja, Belgrade, Serbia",
journal = "6rd Conference of the Serbian Society for Ceramic Materials, Belgrade, Serbia,",
title = "Improved photocatalytic degradation of RO16 dye using hydrothermally synthesized CeO2@ZnO nanocomposite",
pages = "54",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_1990"
}

Simović, B., Milojković, N., Žunić, M., Branković, G.,& Dapčević, A.. (2022). Improved photocatalytic degradation of RO16 dye using hydrothermally synthesized CeO2@ZnO nanocomposite. in 6rd Conference of the Serbian Society for Ceramic Materials, Belgrade, Serbia,
Institut za multidisciplinarna istraživanja, Belgrade, Serbia., 54.
https://hdl.handle.net/21.15107/rcub_rimsi_1990

Simović B, Milojković N, Žunić M, Branković G, Dapčević A. Improved photocatalytic degradation of RO16 dye using hydrothermally synthesized CeO2@ZnO nanocomposite. in 6rd Conference of the Serbian Society for Ceramic Materials, Belgrade, Serbia,. 2022;:54.
https://hdl.handle.net/21.15107/rcub_rimsi_1990 .

Simović, Bojana, Milojković, Natalija, Žunić, Milan, Branković, Goran, Dapčević, Aleksandra, "Improved photocatalytic degradation of RO16 dye using hydrothermally synthesized CeO2@ZnO nanocomposite" in 6rd Conference of the Serbian Society for Ceramic Materials, Belgrade, Serbia, (2022):54,
https://hdl.handle.net/21.15107/rcub_rimsi_1990 .

TY  - THES
AU  - Simović, Bojana
PY  - 2022
UR  - https://eteze.bg.ac.rs/application/showtheses?thesesId=9088
UR  - https://nardus.mpn.gov.rs/handle/123456789/21417
UR  - https://phaidrabg.bg.ac.rs/view/o:29328
UR  - https://fedorabg.bg.ac.rs/fedora/get/o:29328/bdef:Content/download
UR  - https://plus.cobiss.net/cobiss/sr/sr/bib/115386633
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1986
AB  - У овој дисертацији представљено је добијање фотокаталитички активних материјала на бази цинк-оксида, титан-диоксида и церијум-диоксида у циљу уклањања штетних текстилних боја из отпадних вода. Главне методе синтезе биле су солво- и хидротермална, а у појединим случајевима је коришћена и преципитациона. Испитана су структурна, морфолошка, термичка, текстурална, оптичка и фотокаталитичка својства добијених наноматеријала: ZnO, ZnO модификованог сребром, TiO2, различитих титаната натријума, CeO2, као и нанокомпозита CeO2/ZnO и TiO2/ZnTiO3.
Између наночестица ZnO добијених солвотермалном синтезом и микроштапића ZnO добијених хидротермалним процесом нема значајне разлике у фотокаталитичкој активности. Нанопрахови Ag/ZnO синтетисани преципитационом методом су мање ефикасни у разградњи боје RO16 у односу на солвотермално добијене нанопрахове Аg/ZnО.
Девет производа на бази TiO2 је добијено при различитим условима хидротермалног третмана полазног наноанатаса у раствору NaOH. Једнофазни титанат Na0,4H1,6Ti2O5·H2O, који је неактиван за разградњу RО16, добијен је након најинтезивнијег третмана.
Испитан је утицај различитих прекурсора, коришћених при хидротермалној синтези, на добијање CeO2 и његова својства. Иако ниједан добијени нанопрах CeO2 није показао значајну фотокаталитичку активност за разградњу RО16, онај добијен из CeCl3·7H2O показао се као одличан адсорбент.
Код ZnO прахова са различитим садржајем CeO2 одређен је оптималан удео CeО2 у циљу побољшања фотокаталитичке ефикасности ZnО. Композит који садржи 5 mol.% CеО2 има бољу фотокаталитичку ефикасност приликом разградње RО16 у односу на немодификовани ZnО.
Приликом синтезе композита на бази ТiО2 и ZnО добијен је нанокомпозит са 42 mas.% TiO2 и 58 mas.% ZnTiO3 који има већу ефикасност него ТiО2 приликом уклањања боје АG25.
AB  - The synthesis of photocatalytic materials based on ZnO, TiO2 and CeO2 for textile wastewater treatment is presented in this dissertation. The main synthetic procedures were solvo- and hydrothermal but, the precipitation method was used as well. The structural, morphological, thermal, textural, optical and photocatalytic properties of the obtained nanomaterials: ZnO, Аg modified ZnO, TiO2, various Na titanates, CeO2, CeO2/ZnO and TiO2/ZnTiO3 nanocomposites, were examined.
There was no significant difference in photocatalytic activity between the solvothermally obtained ZnO nanoparticles and hydrothermally prepared ZnO microrods. Based on degradation of RO16, all the Ag/ZnO nanopowders obtained by the precipitation method were less efficient than ones synthesized by the solvothermal method.
TiO2-based products were obtained by the hydrothermal treatment of starting nanoanatase using NaOH solution under different conditions. The single Na0.4H1.6Ti2O5·H2O, which was inactive for degradation RO16, was obtained after the most intensive treatment.
The influence of different precursors used in the hydrothermal synthesis, on the properties of obtained CeO2 nanopowders was investigated. Although none of obtained CeO2 did not show any significant photocatalytic activity to RO16, one synthesized from the CeCl3·7H2O exhibited adsorption property.
In order to improve the photocatalytic efficiency of ZnO, the optimal CeO2 content in ZnO powders was determined. The composite containing 5 mol% of CeO2 showed better photocatalytic efficiency in the degradation of RO16 compared to the unmodified ZnO.
The nanocrystalline composite containing 42 wt% of TiO2 and 58 wt% of ZnTiO3, was obtained within the try to synthesize TiO2/ZnO composites, was more efficient than the TiO2 in removal of AG25.
PB  - Univerzitet u Beogradu, Tehnološko-metalurški fakultet
T1  - СИНТЕЗА И КАРАКТЕРИЗАЦИЈА НАНОСТРУКТУРНИХ МАТЕРИЈАЛА НА БАЗИ ЦИНК-ОКСИДА, ТИТАН-ДИОКСИДА И ЦЕРИЈУМ-ДИОКСИДА ЗА ПРИМЕНУ У ФОТОКАТАЛИЗИ
T1  - SYNTHESIS AND CHARACTERIZATION OF NANOSTRUCTURAL MATERIALS BASED ON ZINC OXIDE, TITANIUM DIOXIDE AND CERIUM DIOXIDE FOR APPLICATION IN PHOTOCATALYSIS
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_1986
ER  - 

@phdthesis{
author = "Simović, Bojana",
year = "2022",
abstract = "У овој дисертацији представљено је добијање фотокаталитички активних материјала на бази цинк-оксида, титан-диоксида и церијум-диоксида у циљу уклањања штетних текстилних боја из отпадних вода. Главне методе синтезе биле су солво- и хидротермална, а у појединим случајевима је коришћена и преципитациона. Испитана су структурна, морфолошка, термичка, текстурална, оптичка и фотокаталитичка својства добијених наноматеријала: ZnO, ZnO модификованог сребром, TiO2, различитих титаната натријума, CeO2, као и нанокомпозита CeO2/ZnO и TiO2/ZnTiO3.
Између наночестица ZnO добијених солвотермалном синтезом и микроштапића ZnO добијених хидротермалним процесом нема значајне разлике у фотокаталитичкој активности. Нанопрахови Ag/ZnO синтетисани преципитационом методом су мање ефикасни у разградњи боје RO16 у односу на солвотермално добијене нанопрахове Аg/ZnО.
Девет производа на бази TiO2 је добијено при различитим условима хидротермалног третмана полазног наноанатаса у раствору NaOH. Једнофазни титанат Na0,4H1,6Ti2O5·H2O, који је неактиван за разградњу RО16, добијен је након најинтезивнијег третмана.
Испитан је утицај различитих прекурсора, коришћених при хидротермалној синтези, на добијање CeO2 и његова својства. Иако ниједан добијени нанопрах CeO2 није показао значајну фотокаталитичку активност за разградњу RО16, онај добијен из CeCl3·7H2O показао се као одличан адсорбент.
Код ZnO прахова са различитим садржајем CeO2 одређен је оптималан удео CeО2 у циљу побољшања фотокаталитичке ефикасности ZnО. Композит који садржи 5 mol.% CеО2 има бољу фотокаталитичку ефикасност приликом разградње RО16 у односу на немодификовани ZnО.
Приликом синтезе композита на бази ТiО2 и ZnО добијен је нанокомпозит са 42 mas.% TiO2 и 58 mas.% ZnTiO3 који има већу ефикасност него ТiО2 приликом уклањања боје АG25., The synthesis of photocatalytic materials based on ZnO, TiO2 and CeO2 for textile wastewater treatment is presented in this dissertation. The main synthetic procedures were solvo- and hydrothermal but, the precipitation method was used as well. The structural, morphological, thermal, textural, optical and photocatalytic properties of the obtained nanomaterials: ZnO, Аg modified ZnO, TiO2, various Na titanates, CeO2, CeO2/ZnO and TiO2/ZnTiO3 nanocomposites, were examined.
There was no significant difference in photocatalytic activity between the solvothermally obtained ZnO nanoparticles and hydrothermally prepared ZnO microrods. Based on degradation of RO16, all the Ag/ZnO nanopowders obtained by the precipitation method were less efficient than ones synthesized by the solvothermal method.
TiO2-based products were obtained by the hydrothermal treatment of starting nanoanatase using NaOH solution under different conditions. The single Na0.4H1.6Ti2O5·H2O, which was inactive for degradation RO16, was obtained after the most intensive treatment.
The influence of different precursors used in the hydrothermal synthesis, on the properties of obtained CeO2 nanopowders was investigated. Although none of obtained CeO2 did not show any significant photocatalytic activity to RO16, one synthesized from the CeCl3·7H2O exhibited adsorption property.
In order to improve the photocatalytic efficiency of ZnO, the optimal CeO2 content in ZnO powders was determined. The composite containing 5 mol% of CeO2 showed better photocatalytic efficiency in the degradation of RO16 compared to the unmodified ZnO.
The nanocrystalline composite containing 42 wt% of TiO2 and 58 wt% of ZnTiO3, was obtained within the try to synthesize TiO2/ZnO composites, was more efficient than the TiO2 in removal of AG25.",
publisher = "Univerzitet u Beogradu, Tehnološko-metalurški fakultet",
title = "СИНТЕЗА И КАРАКТЕРИЗАЦИЈА НАНОСТРУКТУРНИХ МАТЕРИЈАЛА НА БАЗИ ЦИНК-ОКСИДА, ТИТАН-ДИОКСИДА И ЦЕРИЈУМ-ДИОКСИДА ЗА ПРИМЕНУ У ФОТОКАТАЛИЗИ, SYNTHESIS AND CHARACTERIZATION OF NANOSTRUCTURAL MATERIALS BASED ON ZINC OXIDE, TITANIUM DIOXIDE AND CERIUM DIOXIDE FOR APPLICATION IN PHOTOCATALYSIS",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_1986"
}

Simović, B.. (2022). СИНТЕЗА И КАРАКТЕРИЗАЦИЈА НАНОСТРУКТУРНИХ МАТЕРИЈАЛА НА БАЗИ ЦИНК-ОКСИДА, ТИТАН-ДИОКСИДА И ЦЕРИЈУМ-ДИОКСИДА ЗА ПРИМЕНУ У ФОТОКАТАЛИЗИ. 
Univerzitet u Beogradu, Tehnološko-metalurški fakultet..
https://hdl.handle.net/21.15107/rcub_rimsi_1986

Simović B. СИНТЕЗА И КАРАКТЕРИЗАЦИЈА НАНОСТРУКТУРНИХ МАТЕРИЈАЛА НА БАЗИ ЦИНК-ОКСИДА, ТИТАН-ДИОКСИДА И ЦЕРИЈУМ-ДИОКСИДА ЗА ПРИМЕНУ У ФОТОКАТАЛИЗИ. 2022;.
https://hdl.handle.net/21.15107/rcub_rimsi_1986 .

Simović, Bojana, "СИНТЕЗА И КАРАКТЕРИЗАЦИЈА НАНОСТРУКТУРНИХ МАТЕРИЈАЛА НА БАЗИ ЦИНК-ОКСИДА, ТИТАН-ДИОКСИДА И ЦЕРИЈУМ-ДИОКСИДА ЗА ПРИМЕНУ У ФОТОКАТАЛИЗИ" (2022),
https://hdl.handle.net/21.15107/rcub_rimsi_1986 .

TY  - CONF
AU  - Milojković, Natalija
AU  - Simović, Bojana
AU  - Žunić, Milan
AU  - Dapčević, Aleksandra
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1989
AB  - Poznato je da je titan-dioksid, kao netoksičan, stabilan i ekonomičan materijal, jedan od
najčešće korišćenih fotokatalizatora. S druge strane, elektroprovodni polianilin (PANI) je
takođe pogodan kandidat za primenu u fotokatalizi. Cilj ovog rada bio je dobijanje
nanokompozita TiO2/PANI sa boljom fotokatalitičkom aktivnošću u odnosu na TiO2. U
cilju optimizacije sadržaja polimera sintetisano je 4 uzorka TiO2/x%PANI (x = 0, 1, 3 i
5 mas.%), koji su okarakterisani XRD i TG/DTA metodama, dok je fotokatalitička
aktivnost ispitana kroz razgradnju toksične tekstilne boje RO16. Pokazano je da su svi
kompoziti fotokatalitički aktivniji od TiO2, i da optimalan sadržaj polianilina iznosi
3 mas.%. Naime, uzorak TiO2/3%PANI je, nakon 60 minuta, razgradio 95 % boje, što je za
17 % više u odnosu na TiO2, dok je nakon 120 minuta fotorazgradnja boje potpuna. Pored
toga, ovaj uzorak je pokazao čak 14 puta izraženiju adsorpciju od TiO2. Efikasnost
TiO2/5%PANI je slična TiO2/3%PANI, ali sa slabije izraženim adsorpcionim svojstvima,
dok je efikasnost TiO2/1%PANI bliska TiO2.
AB  - It is well known that the non-toxic, stable and economical titanium dioxide is one of the
most commonly used photocatalysts. On the other hand, the conductive polyaniline (PANI)
is also suitable candidate for photocatalytic application. The aim of this work was to obtain
the TiO2/PANI nanocomposites with increased photocatalytic activity comparing to TiO2.
In order to determine the optimal PANI content, four TiO2/x%PANI samples (x = 0, 1, 3
and 5 wt.%) were synthesized and characterized by XRD and TG/DTA analysis. The
photocatalytic activity was tested on the toxic textile RO16 dye. It is shown that all the
composites exhibited better photocatalytic performances than TiO2 and that the optimal
PANI content amounted 3 wt.%. Namely, the TiO2/3%PANI degraded 95 % of the dye
within 60 minutes, which is for 17 % better comparing to TiO2. The full photodegradation
was reached in 120 min. This sample showed even 14 times better adsorption than TiO2.
The efficiency of TiO2/5%PANI was similar to TiO2/3%PANI, but with poorer adsorption,
while the efficiency of TiO2/1%PANI was close to TiO2.
PB  - Srpsko hemijsko društvo/Serbian Chemical Society
C3  - 58th Meeting of the Serbian Chemical Society, Belgrade, Book of Abstracts
T1  - TiO2/PANI nanocomposites for photocatalytic application
T1  - Nanokompoziti TiO2/PANI za primenu u fotokatalizi
SP  - 105
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_1989
ER  - 

@conference{
author = "Milojković, Natalija and Simović, Bojana and Žunić, Milan and Dapčević, Aleksandra",
year = "2022",
abstract = "Poznato je da je titan-dioksid, kao netoksičan, stabilan i ekonomičan materijal, jedan od
najčešće korišćenih fotokatalizatora. S druge strane, elektroprovodni polianilin (PANI) je
takođe pogodan kandidat za primenu u fotokatalizi. Cilj ovog rada bio je dobijanje
nanokompozita TiO2/PANI sa boljom fotokatalitičkom aktivnošću u odnosu na TiO2. U
cilju optimizacije sadržaja polimera sintetisano je 4 uzorka TiO2/x%PANI (x = 0, 1, 3 i
5 mas.%), koji su okarakterisani XRD i TG/DTA metodama, dok je fotokatalitička
aktivnost ispitana kroz razgradnju toksične tekstilne boje RO16. Pokazano je da su svi
kompoziti fotokatalitički aktivniji od TiO2, i da optimalan sadržaj polianilina iznosi
3 mas.%. Naime, uzorak TiO2/3%PANI je, nakon 60 minuta, razgradio 95 % boje, što je za
17 % više u odnosu na TiO2, dok je nakon 120 minuta fotorazgradnja boje potpuna. Pored
toga, ovaj uzorak je pokazao čak 14 puta izraženiju adsorpciju od TiO2. Efikasnost
TiO2/5%PANI je slična TiO2/3%PANI, ali sa slabije izraženim adsorpcionim svojstvima,
dok je efikasnost TiO2/1%PANI bliska TiO2., It is well known that the non-toxic, stable and economical titanium dioxide is one of the
most commonly used photocatalysts. On the other hand, the conductive polyaniline (PANI)
is also suitable candidate for photocatalytic application. The aim of this work was to obtain
the TiO2/PANI nanocomposites with increased photocatalytic activity comparing to TiO2.
In order to determine the optimal PANI content, four TiO2/x%PANI samples (x = 0, 1, 3
and 5 wt.%) were synthesized and characterized by XRD and TG/DTA analysis. The
photocatalytic activity was tested on the toxic textile RO16 dye. It is shown that all the
composites exhibited better photocatalytic performances than TiO2 and that the optimal
PANI content amounted 3 wt.%. Namely, the TiO2/3%PANI degraded 95 % of the dye
within 60 minutes, which is for 17 % better comparing to TiO2. The full photodegradation
was reached in 120 min. This sample showed even 14 times better adsorption than TiO2.
The efficiency of TiO2/5%PANI was similar to TiO2/3%PANI, but with poorer adsorption,
while the efficiency of TiO2/1%PANI was close to TiO2.",
publisher = "Srpsko hemijsko društvo/Serbian Chemical Society",
journal = "58th Meeting of the Serbian Chemical Society, Belgrade, Book of Abstracts",
title = "TiO2/PANI nanocomposites for photocatalytic application, Nanokompoziti TiO2/PANI za primenu u fotokatalizi",
pages = "105",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_1989"
}

Milojković, N., Simović, B., Žunić, M.,& Dapčević, A.. (2022). TiO2/PANI nanocomposites for photocatalytic application. in 58th Meeting of the Serbian Chemical Society, Belgrade, Book of Abstracts
Srpsko hemijsko društvo/Serbian Chemical Society., 105.
https://hdl.handle.net/21.15107/rcub_rimsi_1989

Milojković N, Simović B, Žunić M, Dapčević A. TiO2/PANI nanocomposites for photocatalytic application. in 58th Meeting of the Serbian Chemical Society, Belgrade, Book of Abstracts. 2022;:105.
https://hdl.handle.net/21.15107/rcub_rimsi_1989 .

Milojković, Natalija, Simović, Bojana, Žunić, Milan, Dapčević, Aleksandra, "TiO2/PANI nanocomposites for photocatalytic application" in 58th Meeting of the Serbian Chemical Society, Belgrade, Book of Abstracts (2022):105,
https://hdl.handle.net/21.15107/rcub_rimsi_1989 .

TY  - CONF
AU  - Milojković, Natalija
AU  - Simović, Bojana
AU  - Žunić, Milan
AU  - Dapčević, Aleksandra
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1987
AB  - Titanium dioxide is the most suitable semiconductor for photocatalytic application due
to its high efficiency, increased stability, low-cost, and non-toxicity. However, it is
possible to enhance the photocatalytic activity of TiO2 by homogenizing it with
conductive polymers. One of the most attractive conductive polymers is polypyrrole
(PPy) owing to its stability, low-cost, and special redox properties. The aim of this work
was to obtain the TiO2/PPy nanocomposites with a higher photocatalytic activity
compared to TiO2. In order to determine the optimal content of PPy, four TiO2/x%PPy
samples (x = 0, 1, 3, and 5 wt.%) were synthesized and characterized by XRD and
TG/DSC analyses. The photocatalytic activity was examined towards the degradation of
toxic textile azo dye Reactive Orange 16. It was observed that an increase in PPy content
led to better adsorption capacity of the synthesized nanocomposites. Samples
TiO2/1%PPy and TiO2/5%PPy demonstrated better photocatalytic activity than TiO2,
while TiO2/3%PPy showed very similar photocatalytic activity to TiO2. Near complete
degradation of the dye (98 %) was reached in 75 min by using TiO2/1%PPy, comparing
to pure TiO2, which degraded the same amount of the dye in 120 min. Considering all
the obtained results, the optimal content of PPy in the composite for degradation of
Reactive Orange 16 is 1 wt.%.
PB  - Serbian Chemical Society
C3  - Eight Conference of the Young Chemists of  Serbia, Belgrade, Book of Abstracts
T1  - Highly efficient TiO2/Ppy photocatalysts
SP  - 93
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_1987
ER  - 

@conference{
author = "Milojković, Natalija and Simović, Bojana and Žunić, Milan and Dapčević, Aleksandra",
year = "2022",
abstract = "Titanium dioxide is the most suitable semiconductor for photocatalytic application due
to its high efficiency, increased stability, low-cost, and non-toxicity. However, it is
possible to enhance the photocatalytic activity of TiO2 by homogenizing it with
conductive polymers. One of the most attractive conductive polymers is polypyrrole
(PPy) owing to its stability, low-cost, and special redox properties. The aim of this work
was to obtain the TiO2/PPy nanocomposites with a higher photocatalytic activity
compared to TiO2. In order to determine the optimal content of PPy, four TiO2/x%PPy
samples (x = 0, 1, 3, and 5 wt.%) were synthesized and characterized by XRD and
TG/DSC analyses. The photocatalytic activity was examined towards the degradation of
toxic textile azo dye Reactive Orange 16. It was observed that an increase in PPy content
led to better adsorption capacity of the synthesized nanocomposites. Samples
TiO2/1%PPy and TiO2/5%PPy demonstrated better photocatalytic activity than TiO2,
while TiO2/3%PPy showed very similar photocatalytic activity to TiO2. Near complete
degradation of the dye (98 %) was reached in 75 min by using TiO2/1%PPy, comparing
to pure TiO2, which degraded the same amount of the dye in 120 min. Considering all
the obtained results, the optimal content of PPy in the composite for degradation of
Reactive Orange 16 is 1 wt.%.",
publisher = "Serbian Chemical Society",
journal = "Eight Conference of the Young Chemists of  Serbia, Belgrade, Book of Abstracts",
title = "Highly efficient TiO2/Ppy photocatalysts",
pages = "93",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_1987"
}

Milojković, N., Simović, B., Žunić, M.,& Dapčević, A.. (2022). Highly efficient TiO2/Ppy photocatalysts. in Eight Conference of the Young Chemists of  Serbia, Belgrade, Book of Abstracts
Serbian Chemical Society., 93.
https://hdl.handle.net/21.15107/rcub_rimsi_1987

Milojković N, Simović B, Žunić M, Dapčević A. Highly efficient TiO2/Ppy photocatalysts. in Eight Conference of the Young Chemists of  Serbia, Belgrade, Book of Abstracts. 2022;:93.
https://hdl.handle.net/21.15107/rcub_rimsi_1987 .

Milojković, Natalija, Simović, Bojana, Žunić, Milan, Dapčević, Aleksandra, "Highly efficient TiO2/Ppy photocatalysts" in Eight Conference of the Young Chemists of  Serbia, Belgrade, Book of Abstracts (2022):93,
https://hdl.handle.net/21.15107/rcub_rimsi_1987 .

TY  - CONF
AU  - Milojković, Natalija
AU  - Orlić, Marina
AU  - Dikić, Jelena
AU  - Žunić, Milan
AU  - Simović, Bojana
AU  - Dapčević, Aleksandra
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1969
AB  - Regarding enormous expansion of bacterial contamination as well as their increase resistivity to commonly used disinfectants, there is a great demand for antibacterial material, which will not be based on organic compounds. Among various inorganic substances, environmentally friendly, low-cost and chemically stable ZnO and TiO2 demonstrate considerable antibacterial activity.
This work primarily focuses on idea of developing novel disinfectant based on both, ZnO and TiO2, which would integrate all the worthy properties of both oxides. For that matter, titanium(IV) butoxide was dissolved in a solution of zinc acetate following with the ammonia addition until pH value was 8.5. Half of the initial solution was hydrothermally treated, dried and calcined at 500 (H-ZnTi-500) and 800°C (H-ZnTi-800). Two other samples (ZnTi-500 and ZnTi-800) were obtained from the other half of the initial solution which was directly dried and calcined under the same conditions. The samples were characterized by XRD including Rietveld refinement, FESEM
and TG/DTA. Antibacterial activity was examined towards Gram-positive S. aureus and Gram-negative E. coli .
The results showed that only ZnTi-800 consisted of pure Zn2TiO4 (Fd-3m) while Zn TiO was the major phase in three other samples. In the case of samples calcined at 500 °C, traces of ZnO were found. H-ZnTi-800 contained three phases: Zn2TiO4, ZnO and Zn2Ti3O8 (P4332). Cubic Zn2TiO4 contains two cation sites: tetrahedrally coordinated Zn at 0,0,0 and octahedral site at 5/8,5/8,5/8 shared between Zn and Ti. The calculated a-parameters of all obtained Zn2TiO4 as well as Zn–O and Zn/Ti–O bond distances were independent of synthesis. At 500 °C nanocrystalline Zn2TiO4 were obtained with the crystallite sizes 26 and 71 nm for H-ZnTi-500 and ZnTi-500, respectively, while microcrystalline phases were obtained at 800 °C with the crystallite sizes larger than 110 nm. The soft agglomerates consisted of smaller particles were obtained at 500 °C comparing to samples at 800 °C having more compact agglomerates.
The best antibacterial activity with high reduction in the number of bacteria cells (87.6 % of E. coli and 63.4 % of S. aureus) was exhibited by the ZnTi-500. It means that the purity of samples, crystallite size and softness of agglomerates, influence antibacterial activity and that optimal level of all factors should be reached since ZnTi-500 was almost pure with sufficiently small crystallites and soft agglomerates.
PB  - European Powder Diffraction Conference (17 ; 2022 ; Šibenik)
C3  - European Powder Diffraction Conference -ЕPDIC17, Šibenik, Croatia, Book of Abstracts
T1  - A novel disinfectant based on zinc orthotitanate
SP  - 206
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_1969
ER  - 

@conference{
author = "Milojković, Natalija and Orlić, Marina and Dikić, Jelena and Žunić, Milan and Simović, Bojana and Dapčević, Aleksandra",
year = "2022",
abstract = "Regarding enormous expansion of bacterial contamination as well as their increase resistivity to commonly used disinfectants, there is a great demand for antibacterial material, which will not be based on organic compounds. Among various inorganic substances, environmentally friendly, low-cost and chemically stable ZnO and TiO2 demonstrate considerable antibacterial activity.
This work primarily focuses on idea of developing novel disinfectant based on both, ZnO and TiO2, which would integrate all the worthy properties of both oxides. For that matter, titanium(IV) butoxide was dissolved in a solution of zinc acetate following with the ammonia addition until pH value was 8.5. Half of the initial solution was hydrothermally treated, dried and calcined at 500 (H-ZnTi-500) and 800°C (H-ZnTi-800). Two other samples (ZnTi-500 and ZnTi-800) were obtained from the other half of the initial solution which was directly dried and calcined under the same conditions. The samples were characterized by XRD including Rietveld refinement, FESEM
and TG/DTA. Antibacterial activity was examined towards Gram-positive S. aureus and Gram-negative E. coli .
The results showed that only ZnTi-800 consisted of pure Zn2TiO4 (Fd-3m) while Zn TiO was the major phase in three other samples. In the case of samples calcined at 500 °C, traces of ZnO were found. H-ZnTi-800 contained three phases: Zn2TiO4, ZnO and Zn2Ti3O8 (P4332). Cubic Zn2TiO4 contains two cation sites: tetrahedrally coordinated Zn at 0,0,0 and octahedral site at 5/8,5/8,5/8 shared between Zn and Ti. The calculated a-parameters of all obtained Zn2TiO4 as well as Zn–O and Zn/Ti–O bond distances were independent of synthesis. At 500 °C nanocrystalline Zn2TiO4 were obtained with the crystallite sizes 26 and 71 nm for H-ZnTi-500 and ZnTi-500, respectively, while microcrystalline phases were obtained at 800 °C with the crystallite sizes larger than 110 nm. The soft agglomerates consisted of smaller particles were obtained at 500 °C comparing to samples at 800 °C having more compact agglomerates.
The best antibacterial activity with high reduction in the number of bacteria cells (87.6 % of E. coli and 63.4 % of S. aureus) was exhibited by the ZnTi-500. It means that the purity of samples, crystallite size and softness of agglomerates, influence antibacterial activity and that optimal level of all factors should be reached since ZnTi-500 was almost pure with sufficiently small crystallites and soft agglomerates.",
publisher = "European Powder Diffraction Conference (17 ; 2022 ; Šibenik)",
journal = "European Powder Diffraction Conference -ЕPDIC17, Šibenik, Croatia, Book of Abstracts",
title = "A novel disinfectant based on zinc orthotitanate",
pages = "206",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_1969"
}

Milojković, N., Orlić, M., Dikić, J., Žunić, M., Simović, B.,& Dapčević, A.. (2022). A novel disinfectant based on zinc orthotitanate. in European Powder Diffraction Conference -ЕPDIC17, Šibenik, Croatia, Book of Abstracts
European Powder Diffraction Conference (17 ; 2022 ; Šibenik)., 206.
https://hdl.handle.net/21.15107/rcub_rimsi_1969

Milojković N, Orlić M, Dikić J, Žunić M, Simović B, Dapčević A. A novel disinfectant based on zinc orthotitanate. in European Powder Diffraction Conference -ЕPDIC17, Šibenik, Croatia, Book of Abstracts. 2022;:206.
https://hdl.handle.net/21.15107/rcub_rimsi_1969 .

Milojković, Natalija, Orlić, Marina, Dikić, Jelena, Žunić, Milan, Simović, Bojana, Dapčević, Aleksandra, "A novel disinfectant based on zinc orthotitanate" in European Powder Diffraction Conference -ЕPDIC17, Šibenik, Croatia, Book of Abstracts (2022):206,
https://hdl.handle.net/21.15107/rcub_rimsi_1969 .

TY  - CONF
AU  - Rogan, Jelena
AU  - Radovanovic, Lidija
AU  - Simović, Bojana
AU  - Radovanovic, Zeljko
AU  - Mihajlovski, Katarina
AU  - Dapčević, Aleksandra
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1893
AB  - Zinc oxide nanoparticles (ZnO-NPs) have been a subject of numerous researches owing to their multifunctional properties in many applications, such as solar cells, UV light-emitting devices, gas sensors and photocatalysts. ZnO-NPs can be synthesized through various methods and their features can be tailored by shape and size, resulting in new applications relevant to their structural properties.
	The synthesis of ZnO-NPs via controlled thermal decomposition of the single-source precursors represents a novel synthetic methodology. The basic goal of this study was to investigate the influence of precursors on crystallite size and morphology of the resulting ZnO-NPs. Four structurally characterized Zn complexes with different benzenepolycarboxylato ligands [1] were used as precursors for investigation of photocatalytic and antimicrobial effects of thermally obtained ZnO-NPs.
	The XRPD and FESEM analysis of ZnO-NPs, prepared by thermolysis of Zn precursors at 450 °C in the air atmosphere, revealed hexagonal wurtzite structure (space group P63mc, a ≈ 3.25 and c ≈ 5.21 Å) with an average crystallite size in the range of 39–47 nm and similar morphology. The best photocatalytic activity for degradation of Reactive orange 16 dye has been observed for ZnO-NPs where crystallites form the smallest agglomerates. All obtained ZnO-NPs showed excellent inhibitory effect against Gram-positive bacteria Staphylococcus aureus and Gram-negative bacteria Escherichia coli.
C3  - European Powder Diffraction Conference -ЕPDIC17, Šibenik, Croatia, Book of Abstracts
T1  - Photocatalytic and antimicrobial effects of zinc oxide nanoparticles prepared by thermal decomposition of zinc benzenepolycarboxylato complexes
SP  - 127
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_1893
ER  - 

@conference{
author = "Rogan, Jelena and Radovanovic, Lidija and Simović, Bojana and Radovanovic, Zeljko and Mihajlovski, Katarina and Dapčević, Aleksandra",
year = "2022",
abstract = "Zinc oxide nanoparticles (ZnO-NPs) have been a subject of numerous researches owing to their multifunctional properties in many applications, such as solar cells, UV light-emitting devices, gas sensors and photocatalysts. ZnO-NPs can be synthesized through various methods and their features can be tailored by shape and size, resulting in new applications relevant to their structural properties.
	The synthesis of ZnO-NPs via controlled thermal decomposition of the single-source precursors represents a novel synthetic methodology. The basic goal of this study was to investigate the influence of precursors on crystallite size and morphology of the resulting ZnO-NPs. Four structurally characterized Zn complexes with different benzenepolycarboxylato ligands [1] were used as precursors for investigation of photocatalytic and antimicrobial effects of thermally obtained ZnO-NPs.
	The XRPD and FESEM analysis of ZnO-NPs, prepared by thermolysis of Zn precursors at 450 °C in the air atmosphere, revealed hexagonal wurtzite structure (space group P63mc, a ≈ 3.25 and c ≈ 5.21 Å) with an average crystallite size in the range of 39–47 nm and similar morphology. The best photocatalytic activity for degradation of Reactive orange 16 dye has been observed for ZnO-NPs where crystallites form the smallest agglomerates. All obtained ZnO-NPs showed excellent inhibitory effect against Gram-positive bacteria Staphylococcus aureus and Gram-negative bacteria Escherichia coli.",
journal = "European Powder Diffraction Conference -ЕPDIC17, Šibenik, Croatia, Book of Abstracts",
title = "Photocatalytic and antimicrobial effects of zinc oxide nanoparticles prepared by thermal decomposition of zinc benzenepolycarboxylato complexes",
pages = "127",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_1893"
}

Rogan, J., Radovanovic, L., Simović, B., Radovanovic, Z., Mihajlovski, K.,& Dapčević, A.. (2022). Photocatalytic and antimicrobial effects of zinc oxide nanoparticles prepared by thermal decomposition of zinc benzenepolycarboxylato complexes. in European Powder Diffraction Conference -ЕPDIC17, Šibenik, Croatia, Book of Abstracts, 127.
https://hdl.handle.net/21.15107/rcub_rimsi_1893

Rogan J, Radovanovic L, Simović B, Radovanovic Z, Mihajlovski K, Dapčević A. Photocatalytic and antimicrobial effects of zinc oxide nanoparticles prepared by thermal decomposition of zinc benzenepolycarboxylato complexes. in European Powder Diffraction Conference -ЕPDIC17, Šibenik, Croatia, Book of Abstracts. 2022;:127.
https://hdl.handle.net/21.15107/rcub_rimsi_1893 .

Rogan, Jelena, Radovanovic, Lidija, Simović, Bojana, Radovanovic, Zeljko, Mihajlovski, Katarina, Dapčević, Aleksandra, "Photocatalytic and antimicrobial effects of zinc oxide nanoparticles prepared by thermal decomposition of zinc benzenepolycarboxylato complexes" in European Powder Diffraction Conference -ЕPDIC17, Šibenik, Croatia, Book of Abstracts (2022):127,
https://hdl.handle.net/21.15107/rcub_rimsi_1893 .

TY  - CONF
AU  - Simović, Bojana
AU  - Zdravković, Jelena
AU  - Tasić, Nikola
AU  - Branković, Goran
AU  - Dapčević, Aleksandra
PY  - 2022
UR  - https://myepdic.huk.opalstacked.com/abstracts/299/
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1748
AB  - TiO2-based nanomaterials, such as titanium dioxide and layered titanates, are increasingly used in nanotechnology due to biological and photochemical stability, catalytic activity, non-toxicity and cost-effectiveness. In addition, it is known that some titanates can be used for humidity sensors regarding hydrophilic nature of their surface [1]. Nine TiO2-based products were obtained by the hydrothermal treatment of starting nanoanatase using NaOH solution (c = 5 mol cm–3) under different conditions (from 6 h at 110 °C to 18 h at 160 °C). Such optimization was necessary in order to obtain single sodium titanate phase allowing the testing of sensing properties but also long time waited distinction between titania and titanates in terms of structural and microstructural properties. The intensification of hydrothermal treatment notably increased the solubility of nanoanatase causing the phase and morphology transition from nearly spherical titania nanoparticles into elongated titanate nanosheets. According to XRPD and HRTEM/SAED, the single titanate phase was prepared after the most energy-intensive treatment, i.e. at 160 °C for 18 h. The Na0.4H1.6Ti2O5·H2O could be ascribed as its formula, based on EDS and TG. The phase composition and crystallite size were calculated in Jade software for all nine samples while unit cell parameters of single-phased sodium titanate were obtained by Rietveld refinement using FullProf software in Winplotr environment. The calculated unit cell parameters of sodium titanate, a = 18.16(7) Å, b = 3.754(7) Å, c = 2.99(1) Å, show the slight elongation along a‑axis comparing to H2Ti2O5·H2O (PDF card No. 47-0124) probably due to partial Na+–H+ ion exchange. The TG and FTIR analyses showed the hygroscopic nature of Na0.4H1.6Ti2O5·H2O nanosheets revealing the water adsorption on surface. Hence, the obtained Na0.4H1.6Ti2O5·H2O was for the first time used to produce a humidity sensor, which displayed remarkably rapid response and very fast recovery time.
PB  - European Powder Diffraction Conference (17 ; 2022 ; Šibenik)
C3  - European Powder Diffraction Conference -ЕPDIC17, Šibenik, Hrvatska
T1  - Structural transformation from titania nanoparticles to sodium titanate nanosheet exhibiting sensing properties
SP  - 123
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_1748
ER  - 

@conference{
author = "Simović, Bojana and Zdravković, Jelena and Tasić, Nikola and Branković, Goran and Dapčević, Aleksandra",
year = "2022",
abstract = "TiO2-based nanomaterials, such as titanium dioxide and layered titanates, are increasingly used in nanotechnology due to biological and photochemical stability, catalytic activity, non-toxicity and cost-effectiveness. In addition, it is known that some titanates can be used for humidity sensors regarding hydrophilic nature of their surface [1]. Nine TiO2-based products were obtained by the hydrothermal treatment of starting nanoanatase using NaOH solution (c = 5 mol cm–3) under different conditions (from 6 h at 110 °C to 18 h at 160 °C). Such optimization was necessary in order to obtain single sodium titanate phase allowing the testing of sensing properties but also long time waited distinction between titania and titanates in terms of structural and microstructural properties. The intensification of hydrothermal treatment notably increased the solubility of nanoanatase causing the phase and morphology transition from nearly spherical titania nanoparticles into elongated titanate nanosheets. According to XRPD and HRTEM/SAED, the single titanate phase was prepared after the most energy-intensive treatment, i.e. at 160 °C for 18 h. The Na0.4H1.6Ti2O5·H2O could be ascribed as its formula, based on EDS and TG. The phase composition and crystallite size were calculated in Jade software for all nine samples while unit cell parameters of single-phased sodium titanate were obtained by Rietveld refinement using FullProf software in Winplotr environment. The calculated unit cell parameters of sodium titanate, a = 18.16(7) Å, b = 3.754(7) Å, c = 2.99(1) Å, show the slight elongation along a‑axis comparing to H2Ti2O5·H2O (PDF card No. 47-0124) probably due to partial Na+–H+ ion exchange. The TG and FTIR analyses showed the hygroscopic nature of Na0.4H1.6Ti2O5·H2O nanosheets revealing the water adsorption on surface. Hence, the obtained Na0.4H1.6Ti2O5·H2O was for the first time used to produce a humidity sensor, which displayed remarkably rapid response and very fast recovery time.",
publisher = "European Powder Diffraction Conference (17 ; 2022 ; Šibenik)",
journal = "European Powder Diffraction Conference -ЕPDIC17, Šibenik, Hrvatska",
title = "Structural transformation from titania nanoparticles to sodium titanate nanosheet exhibiting sensing properties",
pages = "123",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_1748"
}

Simović, B., Zdravković, J., Tasić, N., Branković, G.,& Dapčević, A.. (2022). Structural transformation from titania nanoparticles to sodium titanate nanosheet exhibiting sensing properties. in European Powder Diffraction Conference -ЕPDIC17, Šibenik, Hrvatska
European Powder Diffraction Conference (17 ; 2022 ; Šibenik)., 123.
https://hdl.handle.net/21.15107/rcub_rimsi_1748

Simović B, Zdravković J, Tasić N, Branković G, Dapčević A. Structural transformation from titania nanoparticles to sodium titanate nanosheet exhibiting sensing properties. in European Powder Diffraction Conference -ЕPDIC17, Šibenik, Hrvatska. 2022;:123.
https://hdl.handle.net/21.15107/rcub_rimsi_1748 .

Simović, Bojana, Zdravković, Jelena, Tasić, Nikola, Branković, Goran, Dapčević, Aleksandra, "Structural transformation from titania nanoparticles to sodium titanate nanosheet exhibiting sensing properties" in European Powder Diffraction Conference -ЕPDIC17, Šibenik, Hrvatska (2022):123,
https://hdl.handle.net/21.15107/rcub_rimsi_1748 .

TY  - CONF
AU  - Milojković, Natalija
AU  - Orlic, Marina
AU  - Dikić, Jelena
AU  - Žunić, Milan
AU  - Simović, Bojana
AU  - Dapčević, Aleksandra
PY  - 2021
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1992
AB  - Kontaminacija bakterijama je poslednjih godina postala problem na globalnom nivou zbog
čega se javila potreba za novim antibakterijskim agensima. Stabilni titan-
-dioksid i cink-oksid pokazuju antibakterijsku aktivnost te se smatraju pogodnim
materijalima i zbog njihove netoksičnosti i niske cene [1, 2].
Cilj ovog rada bio je dobijanje novog materijala na bazi ZnO i TiO2 sa
antibakterijskim svojstvima. U tu svrhu, titan(IV)-butoksid (25 mol.%) rastvoren je u vodenom
rastvoru cink-acetata (75 mol.%), nakon čega je dodavan amonijak dok
vrednost pH nije iznosila 8,5. Polovina dobijenog rastvora je hidrotermalno tretirana
12 h na 120 °C, zatim sušena 20 h na 100 °C i kalcinisana 1 h na 500 (uzorak H-ZnTi-500) i
800 °C (uzorak H-ZnTi-800). Druga polovina dobijenog rastvora bila je direktno sušena i
kalcinisana pod istim uslovima (uzorci ZnTi-500 i ZnTi-800).
Na osnovu XRD rezultata, fazni sastav i veličina kristalita izračunati su u Powder Cell programu,
dok su parametri jedinične ćelije i dužine veza dobijeni Ritveldovim utačnjavanjem
pomoću FullProf/Winplotr programskog paketa. Termogravimetrijskom analizom nekalcinisanih
uzoraka određena je temperatura kalcinacije. Antibakterijska aktivnost dobijenih prahova ispitana
je prema dva soja bakterija: Gram-pozitivnoj S. aureus ATCC 25923 i Gram-negativnoj E. coli
DSM 498.
Jednofazni kubni Zn2TiO4 (ICSD#162392, prostorna grupa ) dobijen je jedino u slučaju
ZnTi-800, dok je u ostale tri sinteze Zn2TiO4 bio većinska faza. Pored Zn2TiO4, uzorci
H-ZnTi-500 i ZnTi-500 sadržali su 22 i 4 mas.% ZnO (ICSD#26170) redno, dok je u uzorku
H-ZnTi-800 pronađeno 7 mas.% ZnO i 5 mas.% Zn2Ti3O8 (ICSD#083525). Parametar a svih dobijenih
Zn2TiO4 pokazao se nezavisnim od samog procesa sinteze, a dobijene vrednosti su približno
iste: 8,4465(3) za H-ZnTi-500, 8,4604(2) za ZnTi-500, 8,4564(2) za H-ZnTi-800 i 8,4565(2) Å za
ZnTi-800. U strukturi kubnog Zn2TiO4 postoje dva katjonska mesta: tetraedarski koordinirani Zn u
0,0,0, i oktaedarski koordinirani Zn i Ti koji dele položaj 5/8,5/8,5/8. Dužine veza Zn–O i Zn/Ti–
O su takođe nezavisne od uslova sinteze. Na 500 °C dobijeni su nanokristalni Zn2TiO4 (veličina
kristalita iznosila je 26 i 71 nm za H-ZnTi-500 i ZnTi-500, respektivno) dok su mikrokristalni
Zn2TiO4 nastali na 800 °C (veličina kristalita prelazila je 110 nm). Od svih uzoraka, ZnTi-500 je
pokazao najbolju antibakterijsku aktivnost dostignuvši visoki stepen redukcije broja bakterijskih
kolonija: 87,6 % E. coli DSM 498 i 63,4 % S. aureus ATCC 25923. To se može pripisati činjenici
da je u ovom slučaju dobijen gotovo jednofazni Zn2TiO4 sa dovoljno malom veličinom kristalita.
[1] A. Sirelkhatim et al., Nano-Micro Letters, 7 (2015) 219–242.
[2] T. Matsunaga et al., FEMS Microbiology Letters, 29 (1985) 211–214.
AB  - In recent years bacterial contamination has become a significant problem of the global environment
causing the necessity for novel antibacterial agents. Stable,
non-toxic and low cost zinc oxide and titanium dioxide are considered as suitable
antibacterial materials [1, 2].
The aim of this work was to find a new antibacterial material based on both, ZnO and TiO2.
Therefore, titanium(IV) butoxide (25 mole%) was dissolved in a water solution of zinc acetate (75
mole%) after which the ammonia was added until pH was adjusted to 8.5. Half of the obtained
solution was hydrothermally treated for 12 h at 120 °C, dried for 20 h at 100 °C and then calcined
at 500 (sample H-ZnTi-500) and 800 °C (sample H-ZnTi-800) for 1 h. The other half of obtained
solution was directly dried and calcined under the same conditions (samples ZnTi-500 and
ZnTi-800).
Base on XRD data for obtained powders, the phase composition and crystallite size were calculated
in Powder Cell software while unit cell parameters and bond distances were obtained by
Rietveld refinement using FullProf software in Winplotr environment. TG analysis of uncalcined
samples was used to determine temperature of calcination. Antibacterial properties of obtained
powders were examined towards Gram-positive S. aureus ATCC 25923 and Gram-negative E. coli
DSM 498 bacteria.
The single-phase cubic Zn2TiO4 phase (ICSD#162392, space group ) was
obtained in the case of ZnTi-800 while, for three other samples, the Zn2TiO4 is found to be a predominant
phase. Beside Zn2TiO4 samples H-ZnTi-500 and ZnTi-500 contained 22 and 4 wt.% of
ZnO (ICSD#26170) respectively, while H-ZnTi-800 had 7 wt.% of ZnO and 5 wt.% of Zn2Ti3O8
(ICSD#083525). The a-parameter of all obtained Zn2TiO4 was independent of synthetic procedure
having following values: 8.4465(3) for H-ZnTi-500, 8.4604(2) for ZnTi-500, 8.4564(2) for
H-ZnTi-800 and 8.4565(2) Å for ZnTi-800. Two cation sites can be found in cubic Zn2TiO4: tetrahedrally
coordinated Zn at 0,0,0 and octahedral site at 5/8,5/8,5/8 shared between Zn and Ti. The
Zn–O and Zn/Ti–O bond distances were also independent of synthesis. The nanocrystalline
Zn2TiO4 phases were obtained at 500 °C (crystallite size for H-ZnTi-500 and ZnTi-500 were 26
and 71 nm respectively), and microcrystalline ones at 800 °C (the crystallite size exceeded 110
nm). Among all samples, the ZnTi-500 demonstrated the best antibacterial activity reaching high
reduction in the number of bacteria cells: 87.6 % of E. coli DSM 498 and 63.4 % of S. aureus
ATCC 25923. This could be explained by the fact that almost pure Zn2TiO4 phase was obtained
with sufficiently small crystallites.
[1] A. Sirelkhatim et al., Nano-Micro Letters, 7 (2015) 219–242.
[2] T. Matsunaga et al., FEMS Microbiology Letters, 29 (1985) 211–214.
PB  - Српско кристалографско друштво, Београд, Србија; Serbian Crystallographic Society, Belgrade, Serbia
C3  - 27th Conference of the Serbian Crystallographic Society, Kragujevac
T1  - Antibacterial zinc orthotitanate
SP  - 18
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_1992
ER  - 

@conference{
author = "Milojković, Natalija and Orlic, Marina and Dikić, Jelena and Žunić, Milan and Simović, Bojana and Dapčević, Aleksandra",
year = "2021",
abstract = "Kontaminacija bakterijama je poslednjih godina postala problem na globalnom nivou zbog
čega se javila potreba za novim antibakterijskim agensima. Stabilni titan-
-dioksid i cink-oksid pokazuju antibakterijsku aktivnost te se smatraju pogodnim
materijalima i zbog njihove netoksičnosti i niske cene [1, 2].
Cilj ovog rada bio je dobijanje novog materijala na bazi ZnO i TiO2 sa
antibakterijskim svojstvima. U tu svrhu, titan(IV)-butoksid (25 mol.%) rastvoren je u vodenom
rastvoru cink-acetata (75 mol.%), nakon čega je dodavan amonijak dok
vrednost pH nije iznosila 8,5. Polovina dobijenog rastvora je hidrotermalno tretirana
12 h na 120 °C, zatim sušena 20 h na 100 °C i kalcinisana 1 h na 500 (uzorak H-ZnTi-500) i
800 °C (uzorak H-ZnTi-800). Druga polovina dobijenog rastvora bila je direktno sušena i
kalcinisana pod istim uslovima (uzorci ZnTi-500 i ZnTi-800).
Na osnovu XRD rezultata, fazni sastav i veličina kristalita izračunati su u Powder Cell programu,
dok su parametri jedinične ćelije i dužine veza dobijeni Ritveldovim utačnjavanjem
pomoću FullProf/Winplotr programskog paketa. Termogravimetrijskom analizom nekalcinisanih
uzoraka određena je temperatura kalcinacije. Antibakterijska aktivnost dobijenih prahova ispitana
je prema dva soja bakterija: Gram-pozitivnoj S. aureus ATCC 25923 i Gram-negativnoj E. coli
DSM 498.
Jednofazni kubni Zn2TiO4 (ICSD#162392, prostorna grupa ) dobijen je jedino u slučaju
ZnTi-800, dok je u ostale tri sinteze Zn2TiO4 bio većinska faza. Pored Zn2TiO4, uzorci
H-ZnTi-500 i ZnTi-500 sadržali su 22 i 4 mas.% ZnO (ICSD#26170) redno, dok je u uzorku
H-ZnTi-800 pronađeno 7 mas.% ZnO i 5 mas.% Zn2Ti3O8 (ICSD#083525). Parametar a svih dobijenih
Zn2TiO4 pokazao se nezavisnim od samog procesa sinteze, a dobijene vrednosti su približno
iste: 8,4465(3) za H-ZnTi-500, 8,4604(2) za ZnTi-500, 8,4564(2) za H-ZnTi-800 i 8,4565(2) Å za
ZnTi-800. U strukturi kubnog Zn2TiO4 postoje dva katjonska mesta: tetraedarski koordinirani Zn u
0,0,0, i oktaedarski koordinirani Zn i Ti koji dele položaj 5/8,5/8,5/8. Dužine veza Zn–O i Zn/Ti–
O su takođe nezavisne od uslova sinteze. Na 500 °C dobijeni su nanokristalni Zn2TiO4 (veličina
kristalita iznosila je 26 i 71 nm za H-ZnTi-500 i ZnTi-500, respektivno) dok su mikrokristalni
Zn2TiO4 nastali na 800 °C (veličina kristalita prelazila je 110 nm). Od svih uzoraka, ZnTi-500 je
pokazao najbolju antibakterijsku aktivnost dostignuvši visoki stepen redukcije broja bakterijskih
kolonija: 87,6 % E. coli DSM 498 i 63,4 % S. aureus ATCC 25923. To se može pripisati činjenici
da je u ovom slučaju dobijen gotovo jednofazni Zn2TiO4 sa dovoljno malom veličinom kristalita.
[1] A. Sirelkhatim et al., Nano-Micro Letters, 7 (2015) 219–242.
[2] T. Matsunaga et al., FEMS Microbiology Letters, 29 (1985) 211–214., In recent years bacterial contamination has become a significant problem of the global environment
causing the necessity for novel antibacterial agents. Stable,
non-toxic and low cost zinc oxide and titanium dioxide are considered as suitable
antibacterial materials [1, 2].
The aim of this work was to find a new antibacterial material based on both, ZnO and TiO2.
Therefore, titanium(IV) butoxide (25 mole%) was dissolved in a water solution of zinc acetate (75
mole%) after which the ammonia was added until pH was adjusted to 8.5. Half of the obtained
solution was hydrothermally treated for 12 h at 120 °C, dried for 20 h at 100 °C and then calcined
at 500 (sample H-ZnTi-500) and 800 °C (sample H-ZnTi-800) for 1 h. The other half of obtained
solution was directly dried and calcined under the same conditions (samples ZnTi-500 and
ZnTi-800).
Base on XRD data for obtained powders, the phase composition and crystallite size were calculated
in Powder Cell software while unit cell parameters and bond distances were obtained by
Rietveld refinement using FullProf software in Winplotr environment. TG analysis of uncalcined
samples was used to determine temperature of calcination. Antibacterial properties of obtained
powders were examined towards Gram-positive S. aureus ATCC 25923 and Gram-negative E. coli
DSM 498 bacteria.
The single-phase cubic Zn2TiO4 phase (ICSD#162392, space group ) was
obtained in the case of ZnTi-800 while, for three other samples, the Zn2TiO4 is found to be a predominant
phase. Beside Zn2TiO4 samples H-ZnTi-500 and ZnTi-500 contained 22 and 4 wt.% of
ZnO (ICSD#26170) respectively, while H-ZnTi-800 had 7 wt.% of ZnO and 5 wt.% of Zn2Ti3O8
(ICSD#083525). The a-parameter of all obtained Zn2TiO4 was independent of synthetic procedure
having following values: 8.4465(3) for H-ZnTi-500, 8.4604(2) for ZnTi-500, 8.4564(2) for
H-ZnTi-800 and 8.4565(2) Å for ZnTi-800. Two cation sites can be found in cubic Zn2TiO4: tetrahedrally
coordinated Zn at 0,0,0 and octahedral site at 5/8,5/8,5/8 shared between Zn and Ti. The
Zn–O and Zn/Ti–O bond distances were also independent of synthesis. The nanocrystalline
Zn2TiO4 phases were obtained at 500 °C (crystallite size for H-ZnTi-500 and ZnTi-500 were 26
and 71 nm respectively), and microcrystalline ones at 800 °C (the crystallite size exceeded 110
nm). Among all samples, the ZnTi-500 demonstrated the best antibacterial activity reaching high
reduction in the number of bacteria cells: 87.6 % of E. coli DSM 498 and 63.4 % of S. aureus
ATCC 25923. This could be explained by the fact that almost pure Zn2TiO4 phase was obtained
with sufficiently small crystallites.
[1] A. Sirelkhatim et al., Nano-Micro Letters, 7 (2015) 219–242.
[2] T. Matsunaga et al., FEMS Microbiology Letters, 29 (1985) 211–214.",
publisher = "Српско кристалографско друштво, Београд, Србија; Serbian Crystallographic Society, Belgrade, Serbia",
journal = "27th Conference of the Serbian Crystallographic Society, Kragujevac",
title = "Antibacterial zinc orthotitanate",
pages = "18",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_1992"
}

Milojković, N., Orlic, M., Dikić, J., Žunić, M., Simović, B.,& Dapčević, A.. (2021). Antibacterial zinc orthotitanate. in 27th Conference of the Serbian Crystallographic Society, Kragujevac
Српско кристалографско друштво, Београд, Србија; Serbian Crystallographic Society, Belgrade, Serbia., 18.
https://hdl.handle.net/21.15107/rcub_rimsi_1992

Milojković N, Orlic M, Dikić J, Žunić M, Simović B, Dapčević A. Antibacterial zinc orthotitanate. in 27th Conference of the Serbian Crystallographic Society, Kragujevac. 2021;:18.
https://hdl.handle.net/21.15107/rcub_rimsi_1992 .

Milojković, Natalija, Orlic, Marina, Dikić, Jelena, Žunić, Milan, Simović, Bojana, Dapčević, Aleksandra, "Antibacterial zinc orthotitanate" in 27th Conference of the Serbian Crystallographic Society, Kragujevac (2021):18,
https://hdl.handle.net/21.15107/rcub_rimsi_1992 .

TY  - CONF
AU  - Simović, Bojana
AU  - Branković, Goran
AU  - Dapčević, Aleksandra
PY  - 2021
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1993
AB  - Cink-oksid je poznati fotokatalizator koji se uglavnom koristi za razgradnju
organskih zagađujućih suspstanci u vodi uz pomoć veštačke ili sunčeve svetlosti [1, 2]. S druge
strane, modifikovanje poluprovodnog fotokatalizatora drugim oksidima može poboljšati
fotokatalitičku aktivnost usled sinergijskog efekta pojedinačnih oksida u smislu povećanja
adsorpcije i širenja oblasti mogućih talasnih dužina za apsorpciju
svetlosti.
Da bi se odredio optimalan sadržaj CeO2 za najbolju fotokatalitičku aktivnost ZnO, vodeni
rastvor Zn(NO3)2 sa različitim sadržajem Ce(NO3)3 (0; 2,5; 5 i 10 mol.%) tretiran je
hidrotermalnim postupkom na 180 °C tokom 18 h u prisustvu NH3(aq). Dobijeni uzorci ispirani su
destilovanom vodom i etanolom, centrifugirani i sušeni na 105 °C tokom 3 h. Strukturna,
mikrostrukturna, optička i fotokatalitička svojstva dobijenih
prahova ispitana su rendgenskom difrakcijom praha (XRPD), skenirajućom
elektronskom mikroskopijom (FESEM), transmisionom elektronskom mikroskopijom (TEM) i
UV-Vis spektroskopijom. Fotokatalitička aktivnost dobijenih kompozita
ispitana je na tekstilnoj azo-boji reaktivno narandžasta 16 (RO16, od engl. Reactive Orange 16) i
upoređena je sa jednofaznim ZnO.
XRPD rezultati su pokazali da je jednofazni ZnO (heksagonalna struktura vircita, prostorna
grupa P63mc) dobijen u sintezi bez Ce(NO3)3. Ako je sadržaj Ce(NO3)3 bio 2,5; 5 ili 10 mol.%,
dobijeni uzorci sadržali su smešu ZnO i CeO2 (struktura fluorita, prostorna grupa Fm m).
Izračunati fazni sastavi proizvoda dobro odgovaraju polaznim sastavima, čime je potvrđeno
nastajanje kompozita CeO2/ZnO sa različitim molarnim odnosima. Kako se sadržaj CeO2
povećavao primećeno je blago smanjenje zapremine jedinične ćelije ZnO, sa 47,950(4) Å3
za
jednofazni ZnO na 47,726(4) Å3
za 10% CeO2/ZnO, zbog blagog smanjenja parametara jedinične
ćelije: a od 3,2566(1) do 3,2519(1) Å i c od 5,2206(4) do 5,2114(4) Å, redom. Krajnji fazni sastav,
kao i nenarušena vircitna struktura ZnO ukazali su da je CeO2 raspoređen po površini ZnO, što su
potvrdili FESEM i TEM. Mikroskopski rezultati su pokazali da je veličina sfernih kristalita CeO2
bila 5 ± 1 nm, dok je ZnO imao bimodalnu raspodelu veličine kristalita od 5 nm do 4 µm. Stoga
morfologija ZnO praha varira od izduženih nanozrna do
mikroštapića koji dalje grade 3-D morfologiju nalik mašnama. Kompozit 5%CeO2/ZnO je pokazao
najbolju fotokatalitičku aktivnost razgradivši RO16 za 180 minuta.
Nanokompoziti CeO2/ZnO sa 2,5 i 10 mol.% CeO2 pokazali su sličnu fotoaktivnost kao
nemodifikovani ZnO. Može se zaključiti da optimalan sadržaj CeO2 iznosi 5 mol.%.
[1] B. Simović, A. Golubović, I. Veljković, D. Poleti, J. Zdravković, D. Mijin,
A. Bjelajac, Journal of the Serbian Chemical Society, 79 (2014) 1433–1443.
[2] B. Simović, D. Poleti, A. Golubović, A. Matković, M. Šćepanović, B. Babić,
G. Branković, Processing and Application of Ceramics, 11 (2017) 27–38.
AB  - Zinc oxide is a well-known photocatalyst mainly used to degrade organic water pollutants
using artificial or sunlight [1, 2]. On the other hand, the modification of
semiconductor photocatalysts by other oxides can improve their photocatalytic activity regarding
synergistic effect of single oxides in the sense of increasing the adsorption and broadening region
of possible wavelengths for light absorption.
In order to find the optimal CeO2 content for the best photocatalytic activity of ZnO, the
aqueous solution of Zn(NO3)2 with different Ce(NO3)3 content (0, 2.5, 5 and 10 mole%) was
hydrothermally treated at 180 °C for 18 h in the presence of NH3(aq). The obtained samples were
rinsed out with distilled water and ethanol, centrifuged and dried at 105 °C for 3h. The structural,
microstructural, optical and photocatalytic properties of resulting powders have been investigated
by the XRPD, FESEM, TEM and UV-vis techniques. The photocatalytic activity of obtained
composites was tested on the Reactive Orange 16 (RO16) textile azo dye and compared to the
single-phase ZnO.
Based on XRPD results, the single-phase ZnO (hexagonal wurtzite structure, space group
P63mc) was obtained without addition of Ce(NO3)3. If Ce(NO3)3 content was
2.5, 5 or 10 mole.%, the obtained samples consisted of ZnO and CeO2
(fluorite structure, space group Fm m) mixed phases. The calculated final phase
compositions corresponded well with starting compositions, which confirmed the
formation of CeO2/ZnO composites with different molar ratios. As CeO2 content
increased, the slight decrease in ZnO unit cell volume, from 47.950(4) Å3
for
single-phase ZnO to 47.726(4) Å3
for 10% CeO2/ZnO, was noticed due to negligible decrease in
unit cell parameters: a from 3.2566(1) to 3.2519(1) Å and c from 5.2206(4) to 5.2114(4) Å,
respectively. The final phase compositions as well as preserved ZnO wurzite structure indicated
that CeO2 was distributed onto ZnO surface, which was
confirmed by FESEM and TEM. The microscopic results showed that the size of
spherical CeO2 crystallites was 5 ± 1 nm, while ZnO had a bimodal distribution of the crystallite
size from 5 nm to 4 µm. Hence the morphology of ZnO varies from elongated nanograins to
microrods that further build a 3-D tie-like morphology. The 5% CeO2/ZnO composite
demonstrated the best photocatalytic activity by degrading RO16 for
180 minutes. CeO2/ZnO composites with 2.5 and 10 mole.% CeO2 showed similar
photoactivity as unmodified ZnO. It could be concluded that the optimal CeO2 content is 5
mole.%.
[1] B. Simović, A. Golubović, I. Veljković, D. Poleti, J. Zdravković, D. Mijin,
A. Bjelajac, Journal of the Serbian Chemical Society, 79 (2014) 1433–1443.
[2] B. Simović, D. Poleti, A. Golubović, A. Matković, M. Šćepanović, B. Babić,
G. Branković, Processing and Application of Ceramics, 11 (2017) 27–38.
PB  - Српско кристалографско друштво, Београд, Србија,  Serbian Crystallographic Society, Belgrade, Serbia
C3  - 27th Conference of Serbian Crystallographic Society, Kragujevac, Serbia
T1  - FOTOKATALITIČKA RAZGRADNJA BOJE RO16 POMOĆU HIDROTERMALNO SINTETISANIH KOMPOZITA CeO2/ZnO
T1  - PHOTOCATALYTIC DEGRADATION OF RO16 DYE USING HYDROTHERMALLY SYNTHESIZED CeO2/ZnO COMPOSITES
SP  - 72
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_1993
ER  - 

@conference{
author = "Simović, Bojana and Branković, Goran and Dapčević, Aleksandra",
year = "2021",
abstract = "Cink-oksid je poznati fotokatalizator koji se uglavnom koristi za razgradnju
organskih zagađujućih suspstanci u vodi uz pomoć veštačke ili sunčeve svetlosti [1, 2]. S druge
strane, modifikovanje poluprovodnog fotokatalizatora drugim oksidima može poboljšati
fotokatalitičku aktivnost usled sinergijskog efekta pojedinačnih oksida u smislu povećanja
adsorpcije i širenja oblasti mogućih talasnih dužina za apsorpciju
svetlosti.
Da bi se odredio optimalan sadržaj CeO2 za najbolju fotokatalitičku aktivnost ZnO, vodeni
rastvor Zn(NO3)2 sa različitim sadržajem Ce(NO3)3 (0; 2,5; 5 i 10 mol.%) tretiran je
hidrotermalnim postupkom na 180 °C tokom 18 h u prisustvu NH3(aq). Dobijeni uzorci ispirani su
destilovanom vodom i etanolom, centrifugirani i sušeni na 105 °C tokom 3 h. Strukturna,
mikrostrukturna, optička i fotokatalitička svojstva dobijenih
prahova ispitana su rendgenskom difrakcijom praha (XRPD), skenirajućom
elektronskom mikroskopijom (FESEM), transmisionom elektronskom mikroskopijom (TEM) i
UV-Vis spektroskopijom. Fotokatalitička aktivnost dobijenih kompozita
ispitana je na tekstilnoj azo-boji reaktivno narandžasta 16 (RO16, od engl. Reactive Orange 16) i
upoređena je sa jednofaznim ZnO.
XRPD rezultati su pokazali da je jednofazni ZnO (heksagonalna struktura vircita, prostorna
grupa P63mc) dobijen u sintezi bez Ce(NO3)3. Ako je sadržaj Ce(NO3)3 bio 2,5; 5 ili 10 mol.%,
dobijeni uzorci sadržali su smešu ZnO i CeO2 (struktura fluorita, prostorna grupa Fm m).
Izračunati fazni sastavi proizvoda dobro odgovaraju polaznim sastavima, čime je potvrđeno
nastajanje kompozita CeO2/ZnO sa različitim molarnim odnosima. Kako se sadržaj CeO2
povećavao primećeno je blago smanjenje zapremine jedinične ćelije ZnO, sa 47,950(4) Å3
za
jednofazni ZnO na 47,726(4) Å3
za 10% CeO2/ZnO, zbog blagog smanjenja parametara jedinične
ćelije: a od 3,2566(1) do 3,2519(1) Å i c od 5,2206(4) do 5,2114(4) Å, redom. Krajnji fazni sastav,
kao i nenarušena vircitna struktura ZnO ukazali su da je CeO2 raspoređen po površini ZnO, što su
potvrdili FESEM i TEM. Mikroskopski rezultati su pokazali da je veličina sfernih kristalita CeO2
bila 5 ± 1 nm, dok je ZnO imao bimodalnu raspodelu veličine kristalita od 5 nm do 4 µm. Stoga
morfologija ZnO praha varira od izduženih nanozrna do
mikroštapića koji dalje grade 3-D morfologiju nalik mašnama. Kompozit 5%CeO2/ZnO je pokazao
najbolju fotokatalitičku aktivnost razgradivši RO16 za 180 minuta.
Nanokompoziti CeO2/ZnO sa 2,5 i 10 mol.% CeO2 pokazali su sličnu fotoaktivnost kao
nemodifikovani ZnO. Može se zaključiti da optimalan sadržaj CeO2 iznosi 5 mol.%.
[1] B. Simović, A. Golubović, I. Veljković, D. Poleti, J. Zdravković, D. Mijin,
A. Bjelajac, Journal of the Serbian Chemical Society, 79 (2014) 1433–1443.
[2] B. Simović, D. Poleti, A. Golubović, A. Matković, M. Šćepanović, B. Babić,
G. Branković, Processing and Application of Ceramics, 11 (2017) 27–38., Zinc oxide is a well-known photocatalyst mainly used to degrade organic water pollutants
using artificial or sunlight [1, 2]. On the other hand, the modification of
semiconductor photocatalysts by other oxides can improve their photocatalytic activity regarding
synergistic effect of single oxides in the sense of increasing the adsorption and broadening region
of possible wavelengths for light absorption.
In order to find the optimal CeO2 content for the best photocatalytic activity of ZnO, the
aqueous solution of Zn(NO3)2 with different Ce(NO3)3 content (0, 2.5, 5 and 10 mole%) was
hydrothermally treated at 180 °C for 18 h in the presence of NH3(aq). The obtained samples were
rinsed out with distilled water and ethanol, centrifuged and dried at 105 °C for 3h. The structural,
microstructural, optical and photocatalytic properties of resulting powders have been investigated
by the XRPD, FESEM, TEM and UV-vis techniques. The photocatalytic activity of obtained
composites was tested on the Reactive Orange 16 (RO16) textile azo dye and compared to the
single-phase ZnO.
Based on XRPD results, the single-phase ZnO (hexagonal wurtzite structure, space group
P63mc) was obtained without addition of Ce(NO3)3. If Ce(NO3)3 content was
2.5, 5 or 10 mole.%, the obtained samples consisted of ZnO and CeO2
(fluorite structure, space group Fm m) mixed phases. The calculated final phase
compositions corresponded well with starting compositions, which confirmed the
formation of CeO2/ZnO composites with different molar ratios. As CeO2 content
increased, the slight decrease in ZnO unit cell volume, from 47.950(4) Å3
for
single-phase ZnO to 47.726(4) Å3
for 10% CeO2/ZnO, was noticed due to negligible decrease in
unit cell parameters: a from 3.2566(1) to 3.2519(1) Å and c from 5.2206(4) to 5.2114(4) Å,
respectively. The final phase compositions as well as preserved ZnO wurzite structure indicated
that CeO2 was distributed onto ZnO surface, which was
confirmed by FESEM and TEM. The microscopic results showed that the size of
spherical CeO2 crystallites was 5 ± 1 nm, while ZnO had a bimodal distribution of the crystallite
size from 5 nm to 4 µm. Hence the morphology of ZnO varies from elongated nanograins to
microrods that further build a 3-D tie-like morphology. The 5% CeO2/ZnO composite
demonstrated the best photocatalytic activity by degrading RO16 for
180 minutes. CeO2/ZnO composites with 2.5 and 10 mole.% CeO2 showed similar
photoactivity as unmodified ZnO. It could be concluded that the optimal CeO2 content is 5
mole.%.
[1] B. Simović, A. Golubović, I. Veljković, D. Poleti, J. Zdravković, D. Mijin,
A. Bjelajac, Journal of the Serbian Chemical Society, 79 (2014) 1433–1443.
[2] B. Simović, D. Poleti, A. Golubović, A. Matković, M. Šćepanović, B. Babić,
G. Branković, Processing and Application of Ceramics, 11 (2017) 27–38.",
publisher = "Српско кристалографско друштво, Београд, Србија,  Serbian Crystallographic Society, Belgrade, Serbia",
journal = "27th Conference of Serbian Crystallographic Society, Kragujevac, Serbia",
title = "FOTOKATALITIČKA RAZGRADNJA BOJE RO16 POMOĆU HIDROTERMALNO SINTETISANIH KOMPOZITA CeO2/ZnO, PHOTOCATALYTIC DEGRADATION OF RO16 DYE USING HYDROTHERMALLY SYNTHESIZED CeO2/ZnO COMPOSITES",
pages = "72",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_1993"
}

Simović, B., Branković, G.,& Dapčević, A.. (2021). FOTOKATALITIČKA RAZGRADNJA BOJE RO16 POMOĆU HIDROTERMALNO SINTETISANIH KOMPOZITA CeO2/ZnO. in 27th Conference of Serbian Crystallographic Society, Kragujevac, Serbia
Српско кристалографско друштво, Београд, Србија,  Serbian Crystallographic Society, Belgrade, Serbia., 72.
https://hdl.handle.net/21.15107/rcub_rimsi_1993

Simović B, Branković G, Dapčević A. FOTOKATALITIČKA RAZGRADNJA BOJE RO16 POMOĆU HIDROTERMALNO SINTETISANIH KOMPOZITA CeO2/ZnO. in 27th Conference of Serbian Crystallographic Society, Kragujevac, Serbia. 2021;:72.
https://hdl.handle.net/21.15107/rcub_rimsi_1993 .

Simović, Bojana, Branković, Goran, Dapčević, Aleksandra, "FOTOKATALITIČKA RAZGRADNJA BOJE RO16 POMOĆU HIDROTERMALNO SINTETISANIH KOMPOZITA CeO2/ZnO" in 27th Conference of Serbian Crystallographic Society, Kragujevac, Serbia (2021):72,
https://hdl.handle.net/21.15107/rcub_rimsi_1993 .

TY  - JOUR
AU  - Radovanović, Lidija
AU  - Zdravković, Jelena
AU  - Simović, Bojana
AU  - Radovanović, Zeljko
AU  - Mihajlovski, Katarina
AU  - Dramicanin, Miroslav D.
AU  - Rogan, Jelena
PY  - 2020
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1382
AB  - Zinc oxide (ZnO) nanoparticles were obtained by thermal decomposition of one-dimensional zinc-benzenepolycarboxylato complexes as single-sourceprecursors at 450 degrees C in an air atmosphere. The mechanism and kinetics of thermal degradation of zinc-benzenepolycarboxylato complexes were analyzed under non-isothermal conditions in an air atmosphere. The results of X-ray powder diffraction and field emission scanning electron microscopy revealed hexagonal wurtzite structure of ZnO with an average crystallite size in the range of 39-47 nm and similar morphology. The band gap and the specific surface area of ZnO nanoparticles were determined using UV-Vis diffuse reflectance spectroscopy and the Brunauer, Emmett and Teller method, respectively. The photoluminescent, photocatalytic and antimicrobial properties of the ZnO nanoparticles were also examined. The best photocatalytic activity in the degradation of C. I. Reactive Orange 16 dye was observed for the ZnO powder where the crystallites form the smallest agglomerates. All ZnO nanoparticles showed excellent inhibitory effect against Gram-positive bacterium Staphylococcus aureus and Gram-negative bacterium Escherichia coli.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Zinc oxide nanoparticles prepared by thermal decomposition of zinc benzenepolycarboxylato precursors: Photoluminescent, photocatalytic and antimicrobial properties
EP  - 1488
IS  - 11
SP  - 1475
VL  - 85
DO  - 10.2298/JSC200629048R
ER  - 

@article{
author = "Radovanović, Lidija and Zdravković, Jelena and Simović, Bojana and Radovanović, Zeljko and Mihajlovski, Katarina and Dramicanin, Miroslav D. and Rogan, Jelena",
year = "2020",
abstract = "Zinc oxide (ZnO) nanoparticles were obtained by thermal decomposition of one-dimensional zinc-benzenepolycarboxylato complexes as single-sourceprecursors at 450 degrees C in an air atmosphere. The mechanism and kinetics of thermal degradation of zinc-benzenepolycarboxylato complexes were analyzed under non-isothermal conditions in an air atmosphere. The results of X-ray powder diffraction and field emission scanning electron microscopy revealed hexagonal wurtzite structure of ZnO with an average crystallite size in the range of 39-47 nm and similar morphology. The band gap and the specific surface area of ZnO nanoparticles were determined using UV-Vis diffuse reflectance spectroscopy and the Brunauer, Emmett and Teller method, respectively. The photoluminescent, photocatalytic and antimicrobial properties of the ZnO nanoparticles were also examined. The best photocatalytic activity in the degradation of C. I. Reactive Orange 16 dye was observed for the ZnO powder where the crystallites form the smallest agglomerates. All ZnO nanoparticles showed excellent inhibitory effect against Gram-positive bacterium Staphylococcus aureus and Gram-negative bacterium Escherichia coli.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Zinc oxide nanoparticles prepared by thermal decomposition of zinc benzenepolycarboxylato precursors: Photoluminescent, photocatalytic and antimicrobial properties",
pages = "1488-1475",
number = "11",
volume = "85",
doi = "10.2298/JSC200629048R"
}

Radovanović, L., Zdravković, J., Simović, B., Radovanović, Z., Mihajlovski, K., Dramicanin, M. D.,& Rogan, J.. (2020). Zinc oxide nanoparticles prepared by thermal decomposition of zinc benzenepolycarboxylato precursors: Photoluminescent, photocatalytic and antimicrobial properties. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 85(11), 1475-1488.
https://doi.org/10.2298/JSC200629048R

Radovanović L, Zdravković J, Simović B, Radovanović Z, Mihajlovski K, Dramicanin MD, Rogan J. Zinc oxide nanoparticles prepared by thermal decomposition of zinc benzenepolycarboxylato precursors: Photoluminescent, photocatalytic and antimicrobial properties. in Journal of the Serbian Chemical Society. 2020;85(11):1475-1488.
doi:10.2298/JSC200629048R .

Radovanović, Lidija, Zdravković, Jelena, Simović, Bojana, Radovanović, Zeljko, Mihajlovski, Katarina, Dramicanin, Miroslav D., Rogan, Jelena, "Zinc oxide nanoparticles prepared by thermal decomposition of zinc benzenepolycarboxylato precursors: Photoluminescent, photocatalytic and antimicrobial properties" in Journal of the Serbian Chemical Society, 85, no. 11 (2020):1475-1488,
https://doi.org/10.2298/JSC200629048R . .

TY  - JOUR
AU  - Simović, Bojana
AU  - Dapčević, Aleksandra
AU  - Zdravković, Jelena
AU  - Tasić, Nikola
AU  - Kovac, Sabina
AU  - Krstic, Jugoslav
AU  - Branković, Goran
PY  - 2019
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1283
AB  - In this work, nine products were prepared by modifying the experimental conditions (6, 12 and 18 hat 110, 135 and 160 degrees C) of hydrothermal treatment of starting nanoanatase in significantly less concentrated alkaline medium than usual in order to obtain a pure titanate phase. The nanocrystalline samples were characterized by XRPD, FESEM, HRTEM/SAED, EDS, TG, FT-IR, UV-Vis and BET analyses. The results revealed that the structure, texture, morphology and band gap energy of samples strongly depend on conditions of hydrothermal treatment. The intensification of hydrothermal treatment significantly increases the solubility of TiO2 promoting the changes in morphology from nearly spherical titania nanoparticles to elongated titanate nanosheets. The single titanate phase was obtained after energetically the most intensive treatment, i.e. 18 hat 160 degrees C. The step-by-step optimization was thus necessary to finally distinguish the titanates from titania in terms of structural and spectral properties and to finally allow the clarification of long-standing confusion between titania and titanates. The obtained single titanate phase was furtherly used to fabricate a humidity sensor, which showed remarkably rapid response and quick recovery time.
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Alloys and Compounds
T1  - From titania to titanates: Phase and morphological transition in less alkaline medium under mild conditions
EP  - 819
SP  - 810
VL  - 781
DO  - 10.1016/j.jallcom.2018.12.039
ER  - 

@article{
author = "Simović, Bojana and Dapčević, Aleksandra and Zdravković, Jelena and Tasić, Nikola and Kovac, Sabina and Krstic, Jugoslav and Branković, Goran",
year = "2019",
abstract = "In this work, nine products were prepared by modifying the experimental conditions (6, 12 and 18 hat 110, 135 and 160 degrees C) of hydrothermal treatment of starting nanoanatase in significantly less concentrated alkaline medium than usual in order to obtain a pure titanate phase. The nanocrystalline samples were characterized by XRPD, FESEM, HRTEM/SAED, EDS, TG, FT-IR, UV-Vis and BET analyses. The results revealed that the structure, texture, morphology and band gap energy of samples strongly depend on conditions of hydrothermal treatment. The intensification of hydrothermal treatment significantly increases the solubility of TiO2 promoting the changes in morphology from nearly spherical titania nanoparticles to elongated titanate nanosheets. The single titanate phase was obtained after energetically the most intensive treatment, i.e. 18 hat 160 degrees C. The step-by-step optimization was thus necessary to finally distinguish the titanates from titania in terms of structural and spectral properties and to finally allow the clarification of long-standing confusion between titania and titanates. The obtained single titanate phase was furtherly used to fabricate a humidity sensor, which showed remarkably rapid response and quick recovery time.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Alloys and Compounds",
title = "From titania to titanates: Phase and morphological transition in less alkaline medium under mild conditions",
pages = "819-810",
volume = "781",
doi = "10.1016/j.jallcom.2018.12.039"
}

Simović, B., Dapčević, A., Zdravković, J., Tasić, N., Kovac, S., Krstic, J.,& Branković, G.. (2019). From titania to titanates: Phase and morphological transition in less alkaline medium under mild conditions. in Journal of Alloys and Compounds
Elsevier Science Sa, Lausanne., 781, 810-819.
https://doi.org/10.1016/j.jallcom.2018.12.039

Simović B, Dapčević A, Zdravković J, Tasić N, Kovac S, Krstic J, Branković G. From titania to titanates: Phase and morphological transition in less alkaline medium under mild conditions. in Journal of Alloys and Compounds. 2019;781:810-819.
doi:10.1016/j.jallcom.2018.12.039 .

Simović, Bojana, Dapčević, Aleksandra, Zdravković, Jelena, Tasić, Nikola, Kovac, Sabina, Krstic, Jugoslav, Branković, Goran, "From titania to titanates: Phase and morphological transition in less alkaline medium under mild conditions" in Journal of Alloys and Compounds, 781 (2019):810-819,
https://doi.org/10.1016/j.jallcom.2018.12.039 . .

TY  - CONF
AU  - Simović, Bojana
AU  - Dapčević, Aleksandra
AU  - Zdravkovic, Jelena
AU  - Branković, Goran
PY  - 2018
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2092
AB  - The environmental friendly titanium-based nanomaterials such as titania and titanates
are often used in industry regarding to their extraordinary properties: biological and
chemical stability, photocatalytic activity, cost-effectiveness. Among other procedures,
the hydrothermal process became a very important way to synthesize the titania and
titanate nanostructures.
In this work, nine products were obtained by modifying the experimental conditions
(6, 12 and 18 h at 110, 135 and 160 °C) of hydrothermal treatment of starting
nanoanatase in alkaline medium (5 mol dm–3 NaOH solution). The possibility to obtain
the single titanate phase was investigated as well as the influence of different
experimental conditions on structural and microstructural properties of obtained
products.
As shown by XRPD and TEM, when commercial nanoanatase is hydrothermally
treated, the single titanate phase was obtained after energetically the most intensive
treatment i.e. 18 h at 160 °C. Among all other eight products, a certain amount of
anatase remained, with the decreasing content as the temperature and time of
hydrothermal treatment increases. This intensification of hydrothermal treatment
significantly increases the solubility of TiO2 promoting the changes in morphology from
nearly spherical anatase particles to elongated titanate nanosheets. This is the
consequence of Ti−O−Ti bonds breaking and formation of Ti–O–Na or Ti–OH bonds
and thus the growth of lamellar structures giving the complete transformation of anatase
nanoparticles into titanate nanosheets after 18 h at 160 °C. The calculated unit cell
parameters of this titanate phase, a = 18.188(6), b = 3.7669(3), c = 2.9812(6) Å, show
the slight elongation along a-axis comparing to H2Ti2O5·H2O (PDF #47-0124). This
could be explained by partial Na+
–H+
 ion exchange. Based on EDS and TG of obtained
pure titanate, the Na0.4H1.6Ti2O5·H2O formula could be assigned to the titanate phase.
The FTIR and TG analyses showed the hygroscopic nature of Na0.4H1.6Ti2O5·H2O
nanosheets and the consequential surface adsorption of water. However, the
HRTEM/SAED revealed the shortening of interplanar distances along a because of the
dehydratation due to vacuum and electron radiation during the TEM analysis
additionally confirming the layered structure of obtained titanate.
This work describes a simple synthetic procedure for production of titanate
nanosheets useful for diverse applications but also finally distinguish the titanates from
titania in terms of structure and microstructure.
AB  - Ekološki nanomaterijali kao što su titan-dioksid i titanati često se koriste u industriji
zbog njihovih izvanrednih svojstava: biološke i hemijske stabilnosti, fotokatalitičke
aktivnosti, ekonomičnosti. Pored drugih postupaka, hidrotermalni proces postao je
veoma važan metod za sintezu nanostrukturnih titan-dioksida i titanata.
U ovom radu, devet proizvoda dobijeno je variranjem eksperimentalnih uslova (6, 12
i 18 h na 110, 135 i 160 °C) hidrotermalnog tretmana polaznog nanoanatasa u alkalnoj
sredini (5 mol dm–3 rastvora NaOH). Ispitana je mogućnost za dobijanje titanatne faze
kao i uticaj različitih eksperimentalnih uslova na strukturna i mikrostrukturna svojstva
dobijenih proizvoda.
Kao što je pokazano XRPD-om i TEM-om, čista titanatna faza nastaje nakon
najintenzivnijeg hidrotermalnog tretmana, tačnije nakon 18 h na 160 °C. Kod ostalih
osam proizvoda zaostaje određena količina anatasa, pri čemu se ona smanjuje sa
porastom temperature i dužine trajanja hidrotermalnog tretmana. Naime, intenziviranje
hidrotermalnog tretmana znatno povećava rastvorljivost TiO2 dovodeći do promena u
morfologiji od približno sfernih čestica anatasa do izduženih titanatnih nanopločica. Ovo
je posledica raskidanja veza Ti−O−Ti i stvaranja novih veza Ti–O–Na ili Ti–OH pa
samim tim i rast lamelarnih struktura, čime dolazi do transformacije nanočestica anatasa
u titanatne nanopločice.Transformacija je potpuna nakon 18 h na 160 °C. Izračunati
parametri jedinične ćelije ove titanatne faze a = 18,188(6), b = 3,7669(3) i c = 2,9812(6)
Å pokazuju blago izduženje duž a-ose u poređenju sa H2Ti2O5·H2O (PDF #47-0124).
Ovo bi se moglo objasniti delimičnom jonskomizmenom Na+
–H+
. EDS i TG analizama
dobijenog čistog titanata utvrđeno je da je njegova najverovatnija formula
Na0,4H1,6Ti2O5·H2O. FTIR i TG analize pokazale su da nanopločice Na0,4H1,6Ti2O5·H2O
apsorbuju vodu po površini te su potvrdile higroskopnu priroduovog titanata. Međutim,
HRTEM/SAED je pokazao smanjenje međuslojnog rastojanja duž a-osezbog
dehidratacije usled vakuuma i elektronskog zračenja tokom TEM analize dodatno
potvrđujući slojevitu strukturu dobijenog titanata.
Ovaj rad opisuje jednostavan sintetski postupak za dobijanje titanatnih nanopločica
korisnih za razne primene, a takođe konačno objašnjava razliku između titanata i titandioksida sa stanovišta strukure i mikrostrukture.
PB  - Serbian Crystallographic Society, Belgrade, Serbia
C3  - 25nd Conference of the Serbian Crystallographic Society, Bajina Bašta, Serbia
T1  - Phase transition from nanostructured titania to layered titanаte
EP  - 93
SP  - 92
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2092
ER  - 

@conference{
author = "Simović, Bojana and Dapčević, Aleksandra and Zdravkovic, Jelena and Branković, Goran",
year = "2018",
abstract = "The environmental friendly titanium-based nanomaterials such as titania and titanates
are often used in industry regarding to their extraordinary properties: biological and
chemical stability, photocatalytic activity, cost-effectiveness. Among other procedures,
the hydrothermal process became a very important way to synthesize the titania and
titanate nanostructures.
In this work, nine products were obtained by modifying the experimental conditions
(6, 12 and 18 h at 110, 135 and 160 °C) of hydrothermal treatment of starting
nanoanatase in alkaline medium (5 mol dm–3 NaOH solution). The possibility to obtain
the single titanate phase was investigated as well as the influence of different
experimental conditions on structural and microstructural properties of obtained
products.
As shown by XRPD and TEM, when commercial nanoanatase is hydrothermally
treated, the single titanate phase was obtained after energetically the most intensive
treatment i.e. 18 h at 160 °C. Among all other eight products, a certain amount of
anatase remained, with the decreasing content as the temperature and time of
hydrothermal treatment increases. This intensification of hydrothermal treatment
significantly increases the solubility of TiO2 promoting the changes in morphology from
nearly spherical anatase particles to elongated titanate nanosheets. This is the
consequence of Ti−O−Ti bonds breaking and formation of Ti–O–Na or Ti–OH bonds
and thus the growth of lamellar structures giving the complete transformation of anatase
nanoparticles into titanate nanosheets after 18 h at 160 °C. The calculated unit cell
parameters of this titanate phase, a = 18.188(6), b = 3.7669(3), c = 2.9812(6) Å, show
the slight elongation along a-axis comparing to H2Ti2O5·H2O (PDF #47-0124). This
could be explained by partial Na+
–H+
 ion exchange. Based on EDS and TG of obtained
pure titanate, the Na0.4H1.6Ti2O5·H2O formula could be assigned to the titanate phase.
The FTIR and TG analyses showed the hygroscopic nature of Na0.4H1.6Ti2O5·H2O
nanosheets and the consequential surface adsorption of water. However, the
HRTEM/SAED revealed the shortening of interplanar distances along a because of the
dehydratation due to vacuum and electron radiation during the TEM analysis
additionally confirming the layered structure of obtained titanate.
This work describes a simple synthetic procedure for production of titanate
nanosheets useful for diverse applications but also finally distinguish the titanates from
titania in terms of structure and microstructure., Ekološki nanomaterijali kao što su titan-dioksid i titanati često se koriste u industriji
zbog njihovih izvanrednih svojstava: biološke i hemijske stabilnosti, fotokatalitičke
aktivnosti, ekonomičnosti. Pored drugih postupaka, hidrotermalni proces postao je
veoma važan metod za sintezu nanostrukturnih titan-dioksida i titanata.
U ovom radu, devet proizvoda dobijeno je variranjem eksperimentalnih uslova (6, 12
i 18 h na 110, 135 i 160 °C) hidrotermalnog tretmana polaznog nanoanatasa u alkalnoj
sredini (5 mol dm–3 rastvora NaOH). Ispitana je mogućnost za dobijanje titanatne faze
kao i uticaj različitih eksperimentalnih uslova na strukturna i mikrostrukturna svojstva
dobijenih proizvoda.
Kao što je pokazano XRPD-om i TEM-om, čista titanatna faza nastaje nakon
najintenzivnijeg hidrotermalnog tretmana, tačnije nakon 18 h na 160 °C. Kod ostalih
osam proizvoda zaostaje određena količina anatasa, pri čemu se ona smanjuje sa
porastom temperature i dužine trajanja hidrotermalnog tretmana. Naime, intenziviranje
hidrotermalnog tretmana znatno povećava rastvorljivost TiO2 dovodeći do promena u
morfologiji od približno sfernih čestica anatasa do izduženih titanatnih nanopločica. Ovo
je posledica raskidanja veza Ti−O−Ti i stvaranja novih veza Ti–O–Na ili Ti–OH pa
samim tim i rast lamelarnih struktura, čime dolazi do transformacije nanočestica anatasa
u titanatne nanopločice.Transformacija je potpuna nakon 18 h na 160 °C. Izračunati
parametri jedinične ćelije ove titanatne faze a = 18,188(6), b = 3,7669(3) i c = 2,9812(6)
Å pokazuju blago izduženje duž a-ose u poređenju sa H2Ti2O5·H2O (PDF #47-0124).
Ovo bi se moglo objasniti delimičnom jonskomizmenom Na+
–H+
. EDS i TG analizama
dobijenog čistog titanata utvrđeno je da je njegova najverovatnija formula
Na0,4H1,6Ti2O5·H2O. FTIR i TG analize pokazale su da nanopločice Na0,4H1,6Ti2O5·H2O
apsorbuju vodu po površini te su potvrdile higroskopnu priroduovog titanata. Međutim,
HRTEM/SAED je pokazao smanjenje međuslojnog rastojanja duž a-osezbog
dehidratacije usled vakuuma i elektronskog zračenja tokom TEM analize dodatno
potvrđujući slojevitu strukturu dobijenog titanata.
Ovaj rad opisuje jednostavan sintetski postupak za dobijanje titanatnih nanopločica
korisnih za razne primene, a takođe konačno objašnjava razliku između titanata i titandioksida sa stanovišta strukure i mikrostrukture.",
publisher = "Serbian Crystallographic Society, Belgrade, Serbia",
journal = "25nd Conference of the Serbian Crystallographic Society, Bajina Bašta, Serbia",
title = "Phase transition from nanostructured titania to layered titanаte",
pages = "93-92",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2092"
}

Simović, B., Dapčević, A., Zdravkovic, J.,& Branković, G.. (2018). Phase transition from nanostructured titania to layered titanаte. in 25nd Conference of the Serbian Crystallographic Society, Bajina Bašta, Serbia
Serbian Crystallographic Society, Belgrade, Serbia., 92-93.
https://hdl.handle.net/21.15107/rcub_rimsi_2092

Simović B, Dapčević A, Zdravkovic J, Branković G. Phase transition from nanostructured titania to layered titanаte. in 25nd Conference of the Serbian Crystallographic Society, Bajina Bašta, Serbia. 2018;:92-93.
https://hdl.handle.net/21.15107/rcub_rimsi_2092 .

Simović, Bojana, Dapčević, Aleksandra, Zdravkovic, Jelena, Branković, Goran, "Phase transition from nanostructured titania to layered titanаte" in 25nd Conference of the Serbian Crystallographic Society, Bajina Bašta, Serbia (2018):92-93,
https://hdl.handle.net/21.15107/rcub_rimsi_2092 .

TY  - CONF
AU  - Simović, Bojana
AU  - Dapčević, Aleksandra
AU  - Zdravkovic, Jelena
AU  - Krstic, Jugoslav
AU  - Branković, Goran
PY  - 2018
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2091
AB  - Regarding their extraordinary properties, such as biological and chemical sta-
bility, photocatalytic activity, cost-effectiveness, the titanium-based nanoma-
terials are the subject of an intense research. Although titania is well known

as a photocatalyst, the titanates are promising candidates for the wide range

of applications including ion exchange, high adsorption capacity toward or-
ganic molecules and radioactive toxic metal ions[2], in photovoltaics, H- and

Li-storage, gas sensors, etc. The hydrothermal process became a very import-
ant way to obtain these materials in nanostructural form since the discovery of

anatase-based alkaline hydrothermal treatment reported by Kasuga et al. [1].
In this work, nine products were obtained by modifying the experimental conditions

(6, 12 and 18 h at 110, 135 and 160 °C) of hydrothermal treatment of starting nano-
anatase in less alkaline medium (5 mol dm–3 NaOH solution) than usual. Specimens

are labeled as TT–t, where T is temperature of the treatment and t is duration of the
treatment. The step-by-step optimization of this simple and costless procedure was
necessary in order to obtain a pure titanate phase and to finally distinguish the ti-
tanates from titania in terms of structure and microstructure. The nanocrystalline
samples were characterized by HRTEM/SAED, XRPD, EDS, TG, UV-VIS and BET
techniques.According to XRPD and HRTEM, the complete conversion of anatase to pure
titanate phase was achieved after energetically the most intensive treatment, i.e.
18 h at 160 °C. Among other products, a certain amount of anatase remained,
with its decreasing content as the temperature and time of hydrothermal treatment
increases. This increment significantly improves the solubility of TiO2 promoting the
changes in morphology from the approximately spherical anatase nanoparticles into
elongated titanate nanosheets (Fig. 1). Based on EDS and TG, the Na0.4H1.6Ti2O5·H2O
formula could be assigned to T160_18. The HRTEM/SAED revealed the shortening of
interplanar distances along aaxis because of the dehydratation due to the high vacuum
of the TEM chamber and high energy of the electron beam irradiation confirming the
layered structure of Na0.4H1.6Ti2O5·H2O (Fig. 2). Because of the poor characterization
of titanate nanosheets found in literature, the optical and textural properties of
products were also investigated. A blue shift toward lower wavelength is observed
with the temperature increasing being the most pronounced for the T160_18 (Fig. 3).
This is the consequence of full transformation of TiO2 into Na0.4H1.6Ti2O5·H2O. For
the same reason, the values of specific surface areas decreased with the temperature
increasing.
As shown in this work, the structure, morphology and texture of samples strongly
depend of the conditions of hydrothermal treatment. The production of single phase
titanate and its detailed microscopic characterization finally allowed the clarification
of long-standing confusion between titania and titanates.
References:
[1] T Kasuga et al, Langmuir 14 (1998), p. 3160.
[2] Y Zhang et al, RSC Advances 5 (2015), p. 79479.
[3] The authors acknowledge funding from the Ministry of Education, Science and
Technological Development of the Republic of Serbia, Grant Numbers III45007
and III45019. The support of the bilateral cooperation with Slovenia is also
gratefully acknowledged (Project No. 451-03-3095/2014-09/32).
PB  - Serbian Academy of Sciences and Arts, Belgrade
C3  - First International Conference of electron microscopy of nanostructures (ELMINA 2018)
T1  - From Titania to Titanates: Phase and Morphological Transition
EP  - 150
SP  - 148
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2091
ER  - 

@conference{
author = "Simović, Bojana and Dapčević, Aleksandra and Zdravkovic, Jelena and Krstic, Jugoslav and Branković, Goran",
year = "2018",
abstract = "Regarding their extraordinary properties, such as biological and chemical sta-
bility, photocatalytic activity, cost-effectiveness, the titanium-based nanoma-
terials are the subject of an intense research. Although titania is well known

as a photocatalyst, the titanates are promising candidates for the wide range

of applications including ion exchange, high adsorption capacity toward or-
ganic molecules and radioactive toxic metal ions[2], in photovoltaics, H- and

Li-storage, gas sensors, etc. The hydrothermal process became a very import-
ant way to obtain these materials in nanostructural form since the discovery of

anatase-based alkaline hydrothermal treatment reported by Kasuga et al. [1].
In this work, nine products were obtained by modifying the experimental conditions

(6, 12 and 18 h at 110, 135 and 160 °C) of hydrothermal treatment of starting nano-
anatase in less alkaline medium (5 mol dm–3 NaOH solution) than usual. Specimens

are labeled as TT–t, where T is temperature of the treatment and t is duration of the
treatment. The step-by-step optimization of this simple and costless procedure was
necessary in order to obtain a pure titanate phase and to finally distinguish the ti-
tanates from titania in terms of structure and microstructure. The nanocrystalline
samples were characterized by HRTEM/SAED, XRPD, EDS, TG, UV-VIS and BET
techniques.According to XRPD and HRTEM, the complete conversion of anatase to pure
titanate phase was achieved after energetically the most intensive treatment, i.e.
18 h at 160 °C. Among other products, a certain amount of anatase remained,
with its decreasing content as the temperature and time of hydrothermal treatment
increases. This increment significantly improves the solubility of TiO2 promoting the
changes in morphology from the approximately spherical anatase nanoparticles into
elongated titanate nanosheets (Fig. 1). Based on EDS and TG, the Na0.4H1.6Ti2O5·H2O
formula could be assigned to T160_18. The HRTEM/SAED revealed the shortening of
interplanar distances along aaxis because of the dehydratation due to the high vacuum
of the TEM chamber and high energy of the electron beam irradiation confirming the
layered structure of Na0.4H1.6Ti2O5·H2O (Fig. 2). Because of the poor characterization
of titanate nanosheets found in literature, the optical and textural properties of
products were also investigated. A blue shift toward lower wavelength is observed
with the temperature increasing being the most pronounced for the T160_18 (Fig. 3).
This is the consequence of full transformation of TiO2 into Na0.4H1.6Ti2O5·H2O. For
the same reason, the values of specific surface areas decreased with the temperature
increasing.
As shown in this work, the structure, morphology and texture of samples strongly
depend of the conditions of hydrothermal treatment. The production of single phase
titanate and its detailed microscopic characterization finally allowed the clarification
of long-standing confusion between titania and titanates.
References:
[1] T Kasuga et al, Langmuir 14 (1998), p. 3160.
[2] Y Zhang et al, RSC Advances 5 (2015), p. 79479.
[3] The authors acknowledge funding from the Ministry of Education, Science and
Technological Development of the Republic of Serbia, Grant Numbers III45007
and III45019. The support of the bilateral cooperation with Slovenia is also
gratefully acknowledged (Project No. 451-03-3095/2014-09/32).",
publisher = "Serbian Academy of Sciences and Arts, Belgrade",
journal = "First International Conference of electron microscopy of nanostructures (ELMINA 2018)",
title = "From Titania to Titanates: Phase and Morphological Transition",
pages = "150-148",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2091"
}

Simović, B., Dapčević, A., Zdravkovic, J., Krstic, J.,& Branković, G.. (2018). From Titania to Titanates: Phase and Morphological Transition. in First International Conference of electron microscopy of nanostructures (ELMINA 2018)
Serbian Academy of Sciences and Arts, Belgrade., 148-150.
https://hdl.handle.net/21.15107/rcub_rimsi_2091

Simović B, Dapčević A, Zdravkovic J, Krstic J, Branković G. From Titania to Titanates: Phase and Morphological Transition. in First International Conference of electron microscopy of nanostructures (ELMINA 2018). 2018;:148-150.
https://hdl.handle.net/21.15107/rcub_rimsi_2091 .

Simović, Bojana, Dapčević, Aleksandra, Zdravkovic, Jelena, Krstic, Jugoslav, Branković, Goran, "From Titania to Titanates: Phase and Morphological Transition" in First International Conference of electron microscopy of nanostructures (ELMINA 2018) (2018):148-150,
https://hdl.handle.net/21.15107/rcub_rimsi_2091 .

TY  - CONF
AU  - Radovanovic, Lidija
AU  - Vulic, Predrag
AU  - Radovanovic, Zeljko
AU  - Balanč, Bojana
AU  - Simović, Bojana
AU  - zekovic, ivana
AU  - Dramićanin, Miroslav
AU  - Rogan, Jelena
AU  - Zekovic, Ivana
PY  - 2018
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2090
AB  - Transition metal oxides are important materials that have found many applications,
as capacitors, sensors or in energy storage [1]. Synthesis of these compounds
has been realized by various methods, such as hydro(solvo)thermal synthesis,
precipitation, microwave synthesis or sol-gel synthesis [2]. Recently, the thermolysis
of coordination compounds as precursors has been considered as a new approach in
obtaining functional nanosized materials. [3]. In this way, by selecting the proper
precursor, it is possible to control the phase composition, morphology and particle
size of a resulting material [3].
The biphasic powder composed of ZnO (zincite) and ZnMn2O4 (hetaerolite), (I) has been
obtained by thermolysis of bimetallic complex [MnZn2(dipya)3(tpht)3(H2O)4]·2H2O
(dipya = 2,2’-dipyridylamine, tpht = dianion of 1,4-benzenedicarboxylic acid) at
450 °C during 1 h in air atmosphere. Scanning Electron Microscopy (SEM) was
used to investigate the morphology of I (Figure 1). It can be observed that the
morphology consists of deformed spherical grains of ZnO with an average diameter
of 67 nm and elliptical grains of hetaerolite whose average diameter and length
were 156 and 290 nm, respectively. The X-ray powder diffraction (XRPD) was
applied to investigate the structure of I. In Figure 2 two-phase Rietveld refinement

Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018

172
pattern of I is presented (ZnO to ZnMn2O4 phase-ratio of 62:38 wt. %). The main
crystallographic data and Rietveld refinement parameters for ZnO phase are:
hexagonal, space group P63mc, a = 3.2574(1), c = 5.2175(2) Å, V = 47.945(3) Å3
; for
ZnMn2O4 phase are: tetragonal, space group I41/amd, a = 5.7299(3), c = 9.3000(8) Å,
V = 305.34(3) Å3

; Rwp = 4.80 %, Rp = 3.82 %, Rexp = 3.80 % and χ2

= 1.5960. UV-
Vis-NIR absorption spectrum was measured in order to investigate the direct band

gap (Eg) of I. Due to the existence of two phases in I, two different Eg values of
2.4 and 3.3 eV for ZnMn2O4 and ZnO phase, respectively, were determined using
Kubelka-Munk function. The mean size, polydispersity index (PDI) and zeta
potential of spherical grains were measured using Zetasizer Nano Series, Nano ZS.
The mean size was 418.6±53.1 nm while PDI value was found to be 0.354±0.099.
Relatively high values of PDI and low apostate value of zeta potential (–6.55 mV)
are indications of incipient instability of colloidal dispersion of I, probably due to the
formation of agglomerates [4, 5]. Photoluminescence measurements were carried
out at room temperature on Fluorolog-3 Model FL3-221 spectrofluorimeter system
upon excitation at 350 nm, in order to study the optical properties of I. This analysis
revealed one band centred at 422 nm in the blue region of the visible part of the
spectrum, which can possibly be associated with defects in the crystal structure of
the ZnO phase [6].
References:
[1] C Yuan et al, Angewandte Chemie International Edition 53 (2014), 1488.
[2] CNR Rao and B Raveau in “Transition Metal Oxides: Structure, Properties, and
Synthesis of Ceramic Oxides” 2nd edition (WILEY-VCH, New York).
[3] MY Masoomi and A Morsali, Coordination Chemistry Reviews 256 (2012),
2921.
[4] R Greenwood and K Kendall, Journal of the European Ceramic Society 19
(1999), 479.
[5] M Staiger et al, Journal of Dispersion Science and Technology 23 (2002), 619.
[6] H Zeng et al, Advanced Functional Materials 20 (2010), 561.
[7] The authors acknowledge funding from the Ministry of Education, Science and
Technological Development of the Republic of Serbia, Grant Number III45007.
PB  - Serbian Academy of Sciences and Arts, Belgrade
C3  - First International Conference of electron microscopy of nanostructures (ELMINA 2018)
T1  - Synthesis, Structure, Morphology and Properties of Biphasic ZnO–ZnMn2O4
EP  - 173
SP  - 171
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2090
ER  - 

@conference{
author = "Radovanovic, Lidija and Vulic, Predrag and Radovanovic, Zeljko and Balanč, Bojana and Simović, Bojana and zekovic, ivana and Dramićanin, Miroslav and Rogan, Jelena and Zekovic, Ivana",
year = "2018",
abstract = "Transition metal oxides are important materials that have found many applications,
as capacitors, sensors or in energy storage [1]. Synthesis of these compounds
has been realized by various methods, such as hydro(solvo)thermal synthesis,
precipitation, microwave synthesis or sol-gel synthesis [2]. Recently, the thermolysis
of coordination compounds as precursors has been considered as a new approach in
obtaining functional nanosized materials. [3]. In this way, by selecting the proper
precursor, it is possible to control the phase composition, morphology and particle
size of a resulting material [3].
The biphasic powder composed of ZnO (zincite) and ZnMn2O4 (hetaerolite), (I) has been
obtained by thermolysis of bimetallic complex [MnZn2(dipya)3(tpht)3(H2O)4]·2H2O
(dipya = 2,2’-dipyridylamine, tpht = dianion of 1,4-benzenedicarboxylic acid) at
450 °C during 1 h in air atmosphere. Scanning Electron Microscopy (SEM) was
used to investigate the morphology of I (Figure 1). It can be observed that the
morphology consists of deformed spherical grains of ZnO with an average diameter
of 67 nm and elliptical grains of hetaerolite whose average diameter and length
were 156 and 290 nm, respectively. The X-ray powder diffraction (XRPD) was
applied to investigate the structure of I. In Figure 2 two-phase Rietveld refinement

Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018

172
pattern of I is presented (ZnO to ZnMn2O4 phase-ratio of 62:38 wt. %). The main
crystallographic data and Rietveld refinement parameters for ZnO phase are:
hexagonal, space group P63mc, a = 3.2574(1), c = 5.2175(2) Å, V = 47.945(3) Å3
; for
ZnMn2O4 phase are: tetragonal, space group I41/amd, a = 5.7299(3), c = 9.3000(8) Å,
V = 305.34(3) Å3

; Rwp = 4.80 %, Rp = 3.82 %, Rexp = 3.80 % and χ2

= 1.5960. UV-
Vis-NIR absorption spectrum was measured in order to investigate the direct band

gap (Eg) of I. Due to the existence of two phases in I, two different Eg values of
2.4 and 3.3 eV for ZnMn2O4 and ZnO phase, respectively, were determined using
Kubelka-Munk function. The mean size, polydispersity index (PDI) and zeta
potential of spherical grains were measured using Zetasizer Nano Series, Nano ZS.
The mean size was 418.6±53.1 nm while PDI value was found to be 0.354±0.099.
Relatively high values of PDI and low apostate value of zeta potential (–6.55 mV)
are indications of incipient instability of colloidal dispersion of I, probably due to the
formation of agglomerates [4, 5]. Photoluminescence measurements were carried
out at room temperature on Fluorolog-3 Model FL3-221 spectrofluorimeter system
upon excitation at 350 nm, in order to study the optical properties of I. This analysis
revealed one band centred at 422 nm in the blue region of the visible part of the
spectrum, which can possibly be associated with defects in the crystal structure of
the ZnO phase [6].
References:
[1] C Yuan et al, Angewandte Chemie International Edition 53 (2014), 1488.
[2] CNR Rao and B Raveau in “Transition Metal Oxides: Structure, Properties, and
Synthesis of Ceramic Oxides” 2nd edition (WILEY-VCH, New York).
[3] MY Masoomi and A Morsali, Coordination Chemistry Reviews 256 (2012),
2921.
[4] R Greenwood and K Kendall, Journal of the European Ceramic Society 19
(1999), 479.
[5] M Staiger et al, Journal of Dispersion Science and Technology 23 (2002), 619.
[6] H Zeng et al, Advanced Functional Materials 20 (2010), 561.
[7] The authors acknowledge funding from the Ministry of Education, Science and
Technological Development of the Republic of Serbia, Grant Number III45007.",
publisher = "Serbian Academy of Sciences and Arts, Belgrade",
journal = "First International Conference of electron microscopy of nanostructures (ELMINA 2018)",
title = "Synthesis, Structure, Morphology and Properties of Biphasic ZnO–ZnMn2O4",
pages = "173-171",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2090"
}

Radovanovic, L., Vulic, P., Radovanovic, Z., Balanč, B., Simović, B., zekovic, i., Dramićanin, M., Rogan, J.,& Zekovic, I.. (2018). Synthesis, Structure, Morphology and Properties of Biphasic ZnO–ZnMn2O4. in First International Conference of electron microscopy of nanostructures (ELMINA 2018)
Serbian Academy of Sciences and Arts, Belgrade., 171-173.
https://hdl.handle.net/21.15107/rcub_rimsi_2090

Radovanovic L, Vulic P, Radovanovic Z, Balanč B, Simović B, zekovic I, Dramićanin M, Rogan J, Zekovic I. Synthesis, Structure, Morphology and Properties of Biphasic ZnO–ZnMn2O4. in First International Conference of electron microscopy of nanostructures (ELMINA 2018). 2018;:171-173.
https://hdl.handle.net/21.15107/rcub_rimsi_2090 .

Radovanovic, Lidija, Vulic, Predrag, Radovanovic, Zeljko, Balanč, Bojana, Simović, Bojana, zekovic, ivana, Dramićanin, Miroslav, Rogan, Jelena, Zekovic, Ivana, "Synthesis, Structure, Morphology and Properties of Biphasic ZnO–ZnMn2O4" in First International Conference of electron microscopy of nanostructures (ELMINA 2018) (2018):171-173,
https://hdl.handle.net/21.15107/rcub_rimsi_2090 .

TY  - CONF
AU  - Simović, Bojana
AU  - Dapčević, Aleksandra
AU  - Radovanovic, Zeljko
AU  - Golubović, Aleksandar
AU  - Matković, Aleksandar
AU  - Branković, Goran
PY  - 2018
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2089
AB  - Beside wide range of applications, zinc oxide is recently recognized as a promising photocatalyst mainly used to degrade organic water pollutants. The great advantage of ZnO over TiO2, which is the most common photocatalyst, is the absorption in wider solar spectrum, partly in the visible region [1]. Generally, the photocatalytic properties usually depend on the crystallinity and crystallite size, particle size, morphology and pore sizes, surface area, band gap energy, availability of active sites, number and nature of trapped sites, as well as on adsorption/desorption characteristics [2]. The modification of photocatalysts by noble metals can enhance their photocatalytic activity. This paper discuss the influence of synthetic method on photocatalytic activity of obtained powders.
Solvothermal and precipitation methods were chosen for the preparation of Ag/ZnO nanopowders. For the first one, the Zn(CH3COO)2·2H2O with different AgNO3 content (0, 0.75, 1.5 and 3 mol.%) was solvothermally treated at 120 °C for 18 h in the presence of poly(vinyl pyrrolidone), ethylene-glycol and NaOH. The obtained samples were rinsed out with distilled water, centrifuged and dried at 105 °C for 3h. In precipitation method, Zn(CH3COO)2·2H2O was dissolved in ethylene-glycol in the presence of chitosan soluted in acetic acid, which was followed by addition of AgNO3 in the same quantity as used for the solvothermal synthesis. The obtained suspension was heated up to 150 °C for 2 h and then calcined at 400 °C for 1 h (Fig.1).
The prepared samples were characterized by XRPD, FESEM, UV-vis techniques, while photocatalytic properties were tested on Reactive Orange 16 textile azo dye and compared to the commercial ZnO (the average particle size: 20 nm).
84
Based on XRPD, the predominant phase in all samples is ZnO with the weak reflections belonging to Ag for 0.75%Ag/ZnO, which become clearly visible for samples with 1.5 and 3% of Ag. The average crystallite size was calculated using Williamson-Hall method giving 20 ± 2 and 25 ± 2 nm for powders obtained by solvothermal and precipitation method, respectively. The calculated strains were insignificant probably due to low concentration of defects. On the other hand, this is not the case for commercial ZnO with strain of 0.25(3) %. This sample consists of nanoparticles with a slightly elongated spherical shape while all obtained ZnO nanopowders contain mutually similar nanoparticles with approximately spherical shape, which however create diverse forms of agglomerates. The average particle size was around 25 nm for solvothermally synthesized samples and approximately 30 nm for samples obtained by precipitation method.
Comparing to both unmodified ZnO and commercial one, all prepared Ag/ZnO samples showed a broad band at 450 nm (visible region) which causes the narrowing of band gap. The existence of this band is the confirmation that metallic Ag particles were formed, as indicated by XRPD, since they can absorb visible light and activate photocatalyst in visible spectrum.
The photocatalytic measurements showed that all synthesized nanopowders have higher adsorption power and photocatalytic activity than the commercial ZnO (Fig.1). This could be attributed to slightly elongated grains of commercial ZnO and the existence of significant strain. If compare the samples obtained by two different methods, Ag modified ZnO powders from solvothermal method are more efficient than the ones from precipitation method due to the smaller particles of silver.Larger Ag particles on ZnO could cause negative effects, such as light blocked, which result in the decrease of photocatalytic activity. The unmodified ZnO powders have the same efficiency regardless of the synthetic method. Comparing the photocatalytic activity of samples obtained by same method, the Ag distribution and its particle size seems to play the major role.
Summary, no matter which procedure was used, 1.5% Ag/ZnO powders have performed the highest effciency in degradation of RO16. It means that the photocatalytic activity does not depend only on Ag content but the metal distribution is important as well. In this work, it is shown that the optimized content of Ag amounts about 1.5 mol.% regardless of synthetic method and it could be recommended for further research in terms of economy.
References
[1] B. Simović et al., J. Serb. Chem. Soc., 2014, 79, 1433.
[2] B. Simović et al., Process. Appl. Ceram., 2017, 11, 27.
PB  - UNIVERSITY OF BELGRADE – FACULTY OF PHYSICAL CHEMISTRY Belgrade, Serbia
C3  - 3rd International Meeting on Materials Sience for Energy Related Applications, Belgrade, Serbia
T1  - Comparative study of Ag/ZnO nanopowders obtained by solvothermal and precipitation methods
EP  - 85
SP  - 83
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2089
ER  - 

@conference{
author = "Simović, Bojana and Dapčević, Aleksandra and Radovanovic, Zeljko and Golubović, Aleksandar and Matković, Aleksandar and Branković, Goran",
year = "2018",
abstract = "Beside wide range of applications, zinc oxide is recently recognized as a promising photocatalyst mainly used to degrade organic water pollutants. The great advantage of ZnO over TiO2, which is the most common photocatalyst, is the absorption in wider solar spectrum, partly in the visible region [1]. Generally, the photocatalytic properties usually depend on the crystallinity and crystallite size, particle size, morphology and pore sizes, surface area, band gap energy, availability of active sites, number and nature of trapped sites, as well as on adsorption/desorption characteristics [2]. The modification of photocatalysts by noble metals can enhance their photocatalytic activity. This paper discuss the influence of synthetic method on photocatalytic activity of obtained powders.
Solvothermal and precipitation methods were chosen for the preparation of Ag/ZnO nanopowders. For the first one, the Zn(CH3COO)2·2H2O with different AgNO3 content (0, 0.75, 1.5 and 3 mol.%) was solvothermally treated at 120 °C for 18 h in the presence of poly(vinyl pyrrolidone), ethylene-glycol and NaOH. The obtained samples were rinsed out with distilled water, centrifuged and dried at 105 °C for 3h. In precipitation method, Zn(CH3COO)2·2H2O was dissolved in ethylene-glycol in the presence of chitosan soluted in acetic acid, which was followed by addition of AgNO3 in the same quantity as used for the solvothermal synthesis. The obtained suspension was heated up to 150 °C for 2 h and then calcined at 400 °C for 1 h (Fig.1).
The prepared samples were characterized by XRPD, FESEM, UV-vis techniques, while photocatalytic properties were tested on Reactive Orange 16 textile azo dye and compared to the commercial ZnO (the average particle size: 20 nm).
84
Based on XRPD, the predominant phase in all samples is ZnO with the weak reflections belonging to Ag for 0.75%Ag/ZnO, which become clearly visible for samples with 1.5 and 3% of Ag. The average crystallite size was calculated using Williamson-Hall method giving 20 ± 2 and 25 ± 2 nm for powders obtained by solvothermal and precipitation method, respectively. The calculated strains were insignificant probably due to low concentration of defects. On the other hand, this is not the case for commercial ZnO with strain of 0.25(3) %. This sample consists of nanoparticles with a slightly elongated spherical shape while all obtained ZnO nanopowders contain mutually similar nanoparticles with approximately spherical shape, which however create diverse forms of agglomerates. The average particle size was around 25 nm for solvothermally synthesized samples and approximately 30 nm for samples obtained by precipitation method.
Comparing to both unmodified ZnO and commercial one, all prepared Ag/ZnO samples showed a broad band at 450 nm (visible region) which causes the narrowing of band gap. The existence of this band is the confirmation that metallic Ag particles were formed, as indicated by XRPD, since they can absorb visible light and activate photocatalyst in visible spectrum.
The photocatalytic measurements showed that all synthesized nanopowders have higher adsorption power and photocatalytic activity than the commercial ZnO (Fig.1). This could be attributed to slightly elongated grains of commercial ZnO and the existence of significant strain. If compare the samples obtained by two different methods, Ag modified ZnO powders from solvothermal method are more efficient than the ones from precipitation method due to the smaller particles of silver.Larger Ag particles on ZnO could cause negative effects, such as light blocked, which result in the decrease of photocatalytic activity. The unmodified ZnO powders have the same efficiency regardless of the synthetic method. Comparing the photocatalytic activity of samples obtained by same method, the Ag distribution and its particle size seems to play the major role.
Summary, no matter which procedure was used, 1.5% Ag/ZnO powders have performed the highest effciency in degradation of RO16. It means that the photocatalytic activity does not depend only on Ag content but the metal distribution is important as well. In this work, it is shown that the optimized content of Ag amounts about 1.5 mol.% regardless of synthetic method and it could be recommended for further research in terms of economy.
References
[1] B. Simović et al., J. Serb. Chem. Soc., 2014, 79, 1433.
[2] B. Simović et al., Process. Appl. Ceram., 2017, 11, 27.",
publisher = "UNIVERSITY OF BELGRADE – FACULTY OF PHYSICAL CHEMISTRY Belgrade, Serbia",
journal = "3rd International Meeting on Materials Sience for Energy Related Applications, Belgrade, Serbia",
title = "Comparative study of Ag/ZnO nanopowders obtained by solvothermal and precipitation methods",
pages = "85-83",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2089"
}

Simović, B., Dapčević, A., Radovanovic, Z., Golubović, A., Matković, A.,& Branković, G.. (2018). Comparative study of Ag/ZnO nanopowders obtained by solvothermal and precipitation methods. in 3rd International Meeting on Materials Sience for Energy Related Applications, Belgrade, Serbia
UNIVERSITY OF BELGRADE – FACULTY OF PHYSICAL CHEMISTRY Belgrade, Serbia., 83-85.
https://hdl.handle.net/21.15107/rcub_rimsi_2089

Simović B, Dapčević A, Radovanovic Z, Golubović A, Matković A, Branković G. Comparative study of Ag/ZnO nanopowders obtained by solvothermal and precipitation methods. in 3rd International Meeting on Materials Sience for Energy Related Applications, Belgrade, Serbia. 2018;:83-85.
https://hdl.handle.net/21.15107/rcub_rimsi_2089 .

Simović, Bojana, Dapčević, Aleksandra, Radovanovic, Zeljko, Golubović, Aleksandar, Matković, Aleksandar, Branković, Goran, "Comparative study of Ag/ZnO nanopowders obtained by solvothermal and precipitation methods" in 3rd International Meeting on Materials Sience for Energy Related Applications, Belgrade, Serbia (2018):83-85,
https://hdl.handle.net/21.15107/rcub_rimsi_2089 .

TY  - JOUR
AU  - Golubović, Aleksandar
AU  - Simović, Bojana
AU  - Gasic, Slavica
AU  - Mijin, Dušan
AU  - Matković, Aleksandar
AU  - Babić, Biljana M.
AU  - Šćepanović, Maja
PY  - 2017
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1100
AB  - TiO2 nanopowders were produced by sol-gel technique using TiCl4 as a starting material. For the preparation of crystalline anatase with developed surface area, this aqueous solution has been mixed with 0.05 M or 0.07 M (NH4)(2)SO4 solution in a temperature-controlled bath. The pH values of the suspension were 7, 8 or 9. According to the x-ray diffraction (XRD) analysis the anatase crystallite sizes were about 12 nm, which coincided with the average particle size revealed by scanning electron microscopy (SEM). The Raman scattering measurements have shown the presence of a small amount of highly disordered brookite phase in addition to dominant anatase phase with similar nanostructure in all synthesized powders. BET measurements revealed that all synthesized catalysts were fully mesoporous, except the sample synthesized with 0.07 M (NH4)(2)SO4 at pH=9, which had small amount of micropores. The photocatalytic degradation of herbicide Clomazone was carried out for both the pure active substance and as the commercial product (GAMIT 4-EC) under UV irradiation. The best photocatalytic efficiency was obtained for the catalyst with the largest specific surface area, confirming this parameter as crucial for enhanced photocatalytic degradation of the pure active substance and commercial product of herbicide Clomazone.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Sol-gel Synthesis of Anatase Nanopowders for Efficient Photocatalytic Degradation of Herbicide Clomazone in Aqueous Media
EP  - 330
IS  - 3
SP  - 319
VL  - 49
DO  - 10.2298/SOS1703319G
ER  - 

@article{
author = "Golubović, Aleksandar and Simović, Bojana and Gasic, Slavica and Mijin, Dušan and Matković, Aleksandar and Babić, Biljana M. and Šćepanović, Maja",
year = "2017",
abstract = "TiO2 nanopowders were produced by sol-gel technique using TiCl4 as a starting material. For the preparation of crystalline anatase with developed surface area, this aqueous solution has been mixed with 0.05 M or 0.07 M (NH4)(2)SO4 solution in a temperature-controlled bath. The pH values of the suspension were 7, 8 or 9. According to the x-ray diffraction (XRD) analysis the anatase crystallite sizes were about 12 nm, which coincided with the average particle size revealed by scanning electron microscopy (SEM). The Raman scattering measurements have shown the presence of a small amount of highly disordered brookite phase in addition to dominant anatase phase with similar nanostructure in all synthesized powders. BET measurements revealed that all synthesized catalysts were fully mesoporous, except the sample synthesized with 0.07 M (NH4)(2)SO4 at pH=9, which had small amount of micropores. The photocatalytic degradation of herbicide Clomazone was carried out for both the pure active substance and as the commercial product (GAMIT 4-EC) under UV irradiation. The best photocatalytic efficiency was obtained for the catalyst with the largest specific surface area, confirming this parameter as crucial for enhanced photocatalytic degradation of the pure active substance and commercial product of herbicide Clomazone.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Sol-gel Synthesis of Anatase Nanopowders for Efficient Photocatalytic Degradation of Herbicide Clomazone in Aqueous Media",
pages = "330-319",
number = "3",
volume = "49",
doi = "10.2298/SOS1703319G"
}

Golubović, A., Simović, B., Gasic, S., Mijin, D., Matković, A., Babić, B. M.,& Šćepanović, M.. (2017). Sol-gel Synthesis of Anatase Nanopowders for Efficient Photocatalytic Degradation of Herbicide Clomazone in Aqueous Media. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 49(3), 319-330.
https://doi.org/10.2298/SOS1703319G

Golubović A, Simović B, Gasic S, Mijin D, Matković A, Babić BM, Šćepanović M. Sol-gel Synthesis of Anatase Nanopowders for Efficient Photocatalytic Degradation of Herbicide Clomazone in Aqueous Media. in Science of Sintering. 2017;49(3):319-330.
doi:10.2298/SOS1703319G .

Golubović, Aleksandar, Simović, Bojana, Gasic, Slavica, Mijin, Dušan, Matković, Aleksandar, Babić, Biljana M., Šćepanović, Maja, "Sol-gel Synthesis of Anatase Nanopowders for Efficient Photocatalytic Degradation of Herbicide Clomazone in Aqueous Media" in Science of Sintering, 49, no. 3 (2017):319-330,
https://doi.org/10.2298/SOS1703319G . .