Marien, Cédric B. D., Le Pivert, Marie, Azaïs, Antonin, M’Bra, Ignace Christian, Drogui, Patrick ORCID: https://orcid.org/0000-0002-3802-2729, Dirany, Ahmad et Robert, Didier
(2019).
Kinetics and mechanism of Paraquat’s degradation: UV-C photolysis vs UV-C photocatalysis with TiO₂ /SiC foams
Journal of Hazardous Materials
, vol. 370
.
p. 164-171.
DOI: 10.1016/j.jhazmat.2018.06.009.
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Résumé
In this study, the photolytic and photocatalytic removal of the herbicide paraquat is investigated under UV-C (254 nm). For photocatalytic experiments, SiC foams were used with P25-TiO₂ nanoparticles deposited by dip-coating. The foams were characterized by scanning electron microscopy and paraquat’s degradation under UV-C photolysis or photocatalysis, followed by UV–vis spectroscopy, total organic carbon analyzer, LC–MS and ion chromatography. After 3 h of reactions by photolysis and photocatalysis, 4% and 91% of TOC removal were observed. An analysis of degradation by-products showed a similar degradation pathway with pyridinium ions observed by LC/MS and carboxylic acids (succinate, acetate, oxalate and formate) detected by ion chromatography. In conclusion, these two different photo-degradation processes are able to remove paraquat and produce similar by-products. However, the kinetics of degradation is rather slow during photolysis and it is recommended to combine the UV-C lightning with a TiO₂ photocatalyst to improve the mineralization rate.
Type de document: | Article |
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Mots-clés libres: | advanced oxidation process; photocatalysis; photolysis; TiO₂; SiC foam |
Centre: | Centre Eau Terre Environnement |
Date de dépôt: | 27 août 2018 20:36 |
Dernière modification: | 15 févr. 2022 15:58 |
URI: | https://espace.inrs.ca/id/eprint/7303 |
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