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Photocatalytic degradation of metsulfuron methyl in aqueous solution by decatungstate anions

Paper ID Volume ID Publish Year Pages File Format Full-Text
29093 44118 2008 6 PDF Available
Title
Photocatalytic degradation of metsulfuron methyl in aqueous solution by decatungstate anions
Abstract

The degradation of the pesticide metsulfuron methyl was studied in aqueous solutions by using decatungstate anion, W10O324−, as a photocatalyst. An electron transfer process involving the highly oxidizing features of the decatungstate excited state, namely W10O324−*, was clearly observed. The degradation led to the oxidation of the pollutant and the formation of the decatungstate reduced species, i.e. W10O325−. In aerated as well as in oxygen-saturated solutions, the system was found to operate in a photocatalytic way with the formation of superoxide anion and the regeneration of the starting decatungstate species. The phototransformation of the pesticide metsulfuron methyl appeared to occur through three different reaction pathways involving the three main parts of the chemical structure: the aromatic ring, the sulfonylurea bridge and to a less extent the methoxy group of the triazine moiety. Under continuous excitation a partial mineralization of metsulfuron methyl was observed owing to the presence of the triazine structure. A mechanistic scheme for complete degradation of metsulfuron methyl is proposed.

Keywords
Decatungstate; Pesticide; Photocatalysis; Electron transfer; Metsulfuron methyl; Mineralization
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Photocatalytic degradation of metsulfuron methyl in aqueous solution by decatungstate anions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 199, Issues 2–3, 25 September 2008, Pages 297–302
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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