Photo-redox reactions of indole and ferric iron in water
Samo za registrovane korisnike
2016
Autori
Milić Komić, SonjaBogdanović Pristov, Jelena
Popovic-Bijelic, Ana
Zakrzewska, Joanna
Stanić, Marina
Kalauzi, Aleksandar
Spasojević, Ivan
Članak u časopisu (Objavljena verzija)
Metapodaci
Prikaz svih podataka o dokumentuApstrakt
Iron-organic interactions are involved in a variety of environmental phenomena, including photo-redox reactions, iron cycling and bioavailability, as well as contaminant fate. In this study we examined UV-induced redox reactions of iron and indole in water. The presence of one indole in the irradiated system resulted in the presence of eight reduced ferric ions, not counting direct photolysis of Fe3+ complexes with OH-, which gives Fe2+ and hydroxyl radical (HO center dot) as products. The main mechanisms that contribute to indole-related Fe3+ reduction i.e. Fe2+ accumulation are: (i) HO center dot scavenging, which prevents oxidation of Fe2+ by HO center dot; (ii) oxidation of indole and its derivatives by excited ferric iron; (iii) reduction of ferric iron by excited indole (not present under UV-A). Hydrated electrons released by UV-B-excited indole play only a minor role in the reduction of iron. Indole-derived radicals emerged as byproducts of indole/iron photochemistry. H-1 NMR an...d low-T EPR spectroscopy showed that indole forms a weak low-symmetry complex with Fe3+. The strongest interactions between iron and pi-cloud in the indole ring are at positions 2, 3, and 7. The formation of complex promotes electron transfer from excited indole to Fe3+. Our findings are important for understanding the catalysis of photo-reduction of iron by heterocyclic aromatic pollutants, and for the development of protocols for indole processing in wastewaters.
Ključne reči:
UV / Ligand / Iron / Indole / Free radicalIzvor:
Applied Catalysis B-Environmental, 2016, 185, 174-180Izdavač:
- Elsevier, Amsterdam
Finansiranje / projekti:
- Modifikacije antioksidativnog metabolizma biljaka sa ciljem povećanja tolerancije na abiotski stres i identifikacija novih biomarkera sa primenom u remedijaciji i monitoringu degradiranih staništa (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-43010)
- Biomarkeri u neurodegenerativnim i malignim procesima (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-41005)
- Molekularni mehanizmi redoks signalinga u homeostazi, adaptaciji i patologiji (RS-MESTD-Basic Research (BR or ON)-173014)
DOI: 10.1016/j.apcatb.2015.12.018
ISSN: 0926-3373
WoS: 000369452000017
Scopus: 2-s2.0-84950349615
Institucija/grupa
Institut za multidisciplinarna istraživanjaTY - JOUR AU - Milić Komić, Sonja AU - Bogdanović Pristov, Jelena AU - Popovic-Bijelic, Ana AU - Zakrzewska, Joanna AU - Stanić, Marina AU - Kalauzi, Aleksandar AU - Spasojević, Ivan PY - 2016 UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/950 AB - Iron-organic interactions are involved in a variety of environmental phenomena, including photo-redox reactions, iron cycling and bioavailability, as well as contaminant fate. In this study we examined UV-induced redox reactions of iron and indole in water. The presence of one indole in the irradiated system resulted in the presence of eight reduced ferric ions, not counting direct photolysis of Fe3+ complexes with OH-, which gives Fe2+ and hydroxyl radical (HO center dot) as products. The main mechanisms that contribute to indole-related Fe3+ reduction i.e. Fe2+ accumulation are: (i) HO center dot scavenging, which prevents oxidation of Fe2+ by HO center dot; (ii) oxidation of indole and its derivatives by excited ferric iron; (iii) reduction of ferric iron by excited indole (not present under UV-A). Hydrated electrons released by UV-B-excited indole play only a minor role in the reduction of iron. Indole-derived radicals emerged as byproducts of indole/iron photochemistry. H-1 NMR and low-T EPR spectroscopy showed that indole forms a weak low-symmetry complex with Fe3+. The strongest interactions between iron and pi-cloud in the indole ring are at positions 2, 3, and 7. The formation of complex promotes electron transfer from excited indole to Fe3+. Our findings are important for understanding the catalysis of photo-reduction of iron by heterocyclic aromatic pollutants, and for the development of protocols for indole processing in wastewaters. PB - Elsevier, Amsterdam T2 - Applied Catalysis B-Environmental T1 - Photo-redox reactions of indole and ferric iron in water EP - 180 SP - 174 VL - 185 DO - 10.1016/j.apcatb.2015.12.018 ER -
@article{ author = "Milić Komić, Sonja and Bogdanović Pristov, Jelena and Popovic-Bijelic, Ana and Zakrzewska, Joanna and Stanić, Marina and Kalauzi, Aleksandar and Spasojević, Ivan", year = "2016", abstract = "Iron-organic interactions are involved in a variety of environmental phenomena, including photo-redox reactions, iron cycling and bioavailability, as well as contaminant fate. In this study we examined UV-induced redox reactions of iron and indole in water. The presence of one indole in the irradiated system resulted in the presence of eight reduced ferric ions, not counting direct photolysis of Fe3+ complexes with OH-, which gives Fe2+ and hydroxyl radical (HO center dot) as products. The main mechanisms that contribute to indole-related Fe3+ reduction i.e. Fe2+ accumulation are: (i) HO center dot scavenging, which prevents oxidation of Fe2+ by HO center dot; (ii) oxidation of indole and its derivatives by excited ferric iron; (iii) reduction of ferric iron by excited indole (not present under UV-A). Hydrated electrons released by UV-B-excited indole play only a minor role in the reduction of iron. Indole-derived radicals emerged as byproducts of indole/iron photochemistry. H-1 NMR and low-T EPR spectroscopy showed that indole forms a weak low-symmetry complex with Fe3+. The strongest interactions between iron and pi-cloud in the indole ring are at positions 2, 3, and 7. The formation of complex promotes electron transfer from excited indole to Fe3+. Our findings are important for understanding the catalysis of photo-reduction of iron by heterocyclic aromatic pollutants, and for the development of protocols for indole processing in wastewaters.", publisher = "Elsevier, Amsterdam", journal = "Applied Catalysis B-Environmental", title = "Photo-redox reactions of indole and ferric iron in water", pages = "180-174", volume = "185", doi = "10.1016/j.apcatb.2015.12.018" }
Milić Komić, S., Bogdanović Pristov, J., Popovic-Bijelic, A., Zakrzewska, J., Stanić, M., Kalauzi, A.,& Spasojević, I.. (2016). Photo-redox reactions of indole and ferric iron in water. in Applied Catalysis B-Environmental Elsevier, Amsterdam., 185, 174-180. https://doi.org/10.1016/j.apcatb.2015.12.018
Milić Komić S, Bogdanović Pristov J, Popovic-Bijelic A, Zakrzewska J, Stanić M, Kalauzi A, Spasojević I. Photo-redox reactions of indole and ferric iron in water. in Applied Catalysis B-Environmental. 2016;185:174-180. doi:10.1016/j.apcatb.2015.12.018 .
Milić Komić, Sonja, Bogdanović Pristov, Jelena, Popovic-Bijelic, Ana, Zakrzewska, Joanna, Stanić, Marina, Kalauzi, Aleksandar, Spasojević, Ivan, "Photo-redox reactions of indole and ferric iron in water" in Applied Catalysis B-Environmental, 185 (2016):174-180, https://doi.org/10.1016/j.apcatb.2015.12.018 . .