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Photochemical degradation of triazine herbicides - comparison of homogeneous and heterogeneous photocatalysis.
Photochem Photobiol Sci. 2013 Apr; 12(4):660-3.PP

Abstract

Photochemical degradation of atrazine under different conditions was studied and compared, namely degradation via photocatalysis on TiO2, UV C photolysis, and homogeneous photocatalysis in the presence of added ferric ions. The reaction rate constants in heterogeneous photocatalytic reactions on TiO2 and of photolytic degradation by means of UV C light are similar, 0.018 min(-1) and 0.020 min(-1), respectively. The reaction rate constants in homogeneous photocatalytic reactions with Fe(III) added depend strongly on the Fe(III) concentration, 0.0017 min(-1) for 1.6 × 10(-6) mol l(-1) Fe(III) to 0.105 min(-1) for 3.3 × 10(-4) mol l(-1) Fe(III). In all types of reactions, dechlorination was observed; in homogeneous photocatalytic reactions and in UV C (250-300 nm) photolysis, dechlorination proceeds with a 1 : 1 stoichiometry to atrazine degradation, in photocatalytic reactions on TiO2, dechlorination measured as chloride ion release reaches only 1/5 of the substrate degradation. In photocatalytic reactions on TiO2, mineralisation of 40% carbon was observed.

Authors+Show Affiliations

Faculty of Science, University of South Bohemia, Branisovská 31, 370 05 Ceske Budejovice, Czech Republic. sklement@jcu.czNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

23069861

Citation

Klementova, Sarka, and Martin Zlamal. "Photochemical Degradation of Triazine Herbicides - Comparison of Homogeneous and Heterogeneous Photocatalysis." Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology, vol. 12, no. 4, 2013, pp. 660-3.
Klementova S, Zlamal M. Photochemical degradation of triazine herbicides - comparison of homogeneous and heterogeneous photocatalysis. Photochem Photobiol Sci. 2013;12(4):660-3.
Klementova, S., & Zlamal, M. (2013). Photochemical degradation of triazine herbicides - comparison of homogeneous and heterogeneous photocatalysis. Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology, 12(4), 660-3. https://doi.org/10.1039/c2pp25223f
Klementova S, Zlamal M. Photochemical Degradation of Triazine Herbicides - Comparison of Homogeneous and Heterogeneous Photocatalysis. Photochem Photobiol Sci. 2013;12(4):660-3. PubMed PMID: 23069861.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Photochemical degradation of triazine herbicides - comparison of homogeneous and heterogeneous photocatalysis. AU - Klementova,Sarka, AU - Zlamal,Martin, PY - 2012/10/17/entrez PY - 2012/10/17/pubmed PY - 2013/9/11/medline SP - 660 EP - 3 JF - Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology JO - Photochem Photobiol Sci VL - 12 IS - 4 N2 - Photochemical degradation of atrazine under different conditions was studied and compared, namely degradation via photocatalysis on TiO2, UV C photolysis, and homogeneous photocatalysis in the presence of added ferric ions. The reaction rate constants in heterogeneous photocatalytic reactions on TiO2 and of photolytic degradation by means of UV C light are similar, 0.018 min(-1) and 0.020 min(-1), respectively. The reaction rate constants in homogeneous photocatalytic reactions with Fe(III) added depend strongly on the Fe(III) concentration, 0.0017 min(-1) for 1.6 × 10(-6) mol l(-1) Fe(III) to 0.105 min(-1) for 3.3 × 10(-4) mol l(-1) Fe(III). In all types of reactions, dechlorination was observed; in homogeneous photocatalytic reactions and in UV C (250-300 nm) photolysis, dechlorination proceeds with a 1 : 1 stoichiometry to atrazine degradation, in photocatalytic reactions on TiO2, dechlorination measured as chloride ion release reaches only 1/5 of the substrate degradation. In photocatalytic reactions on TiO2, mineralisation of 40% carbon was observed. SN - 1474-9092 UR - https://www.unboundmedicine.com/medline/citation/23069861/Photochemical_degradation_of_triazine_herbicides___comparison_of_homogeneous_and_heterogeneous_photocatalysis_ L2 - https://doi.org/10.1039/c2pp25223f DB - PRIME DP - Unbound Medicine ER -