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HERO ID
3981767
Reference Type
Journal Article
Title
Role of small molecular weight organic acids with different chemical structures as electron donors in the photocatalytic degradation of ronidazole: Synergistic performance and mechanism
Author(s)
Sun, Lei; Chen, D; Wan, S; Yu, Z; Li, M
Year
2017
Is Peer Reviewed?
Yes
Journal
Chemical Engineering Journal
ISSN:
1385-8947
Volume
326
Page Numbers
1030-1039
DOI
10.1016/j.cej.2017.06.053
Web of Science Id
WOS:000406137200102
Abstract
The role of organic acids with different numbers of carboxyl and hydroxyl groups as electron donors in the photocatalytic degradation of ronidazole was demonstrated. The strength of the synergetic effect between photocatalysis and organic acids was related to the structure of the organic acid and followed the order of oxalic acid > citric acid approximate to malic acid > tartaric acid > lactic acid. Organic acids with hydroxyl groups are more important in the production of a synergetic effect than formic, malonic, and succinic acids without a hydroxyl group. The removal efficiency and first-order kinetic constant increased from 84.8% to 97.1% and 0.0314 min (1) to 0.0941 min (1), respectively, at 0.5 mmol L (1) oxalic acid, 0.1 mmol L (1) ronidazole concentration, and 0.5 g L (1) TiO2. The synergistic mechanism is that the organic acid reacts with photo-generated holes to prohibit the recombination of photo-generated electrons and holes as well as form strong reduction potential CO2 center dot radicals based on the results of scavenging experiments. The intermediates in pure photocatalysis and the photocatalytic-oxalic acid system were detected. The possible transformation pathways of ronidazole in the presence of oxalic acid were pro-posed, and such degradation is mainly a reduction process initiated by CO2 center dot and e . (C) 2017 Elsevier B.V. All rights reserved.
Keywords
Photocatalysis; Organic acid; Synergistic mechanism; Ronidazole; Transformation pathway
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^Per- and Polyfluoroalkyl Substances (PFAS)
PFOA (335-67-1) and PFOS (1763-23-1)
Literature Search – Adverse outcome pathway (2015-present)
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PFOA (335-67-1) and PFOS (1763-23-1)
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Excluded/Not on Topic
Literature Search Update (2013-2019)
WOS
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