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Iodosulfuron degradation by TiO2 photocatalysis: Kinetic and reactional pathway investigations

Paper ID Volume ID Publish Year Pages File Format Full-Text
48991 46536 2007 12 PDF Available
Title
Iodosulfuron degradation by TiO2 photocatalysis: Kinetic and reactional pathway investigations
Abstract

The photocatalytic degradation of a sulfonylurea herbicide, iodosulfuron methyl ester (IOME), has been studied in TiO2 aqueous suspensions under UV irradiation. The influence of various parameters such as initial concentration, TiO2 concentration and light intensity on the kinetic process was investigated. Disappearance rate of iodosulfuron followed pseudo-first order kinetics. A special attention was devoted to the identification of intermediates, using a new analytical approach which consists of coupling HPLC–DAD (UV), HPLC–ESI-MS and HPLC–1H NMR techniques after a SPE pre-concentration step. By combining UV, MS and NMR data, up to 20 degradation products were unambiguously identified. Furthermore, 1H NMR data allowed the differentiation of several positional isomers, in particular those of hydroxylation resulting from the attack of OH radicals on the benzene ring of IOME. Kinetic evolution profiles of main intermediates, end products (NO3−, NH4+, SO42−) and total organic carbon (TOC) were also examined in detail. From obtained kinetic and analytical results, the presence of privileged sites for the attack of OH radicals was shown and a detailed degradation pathway was proposed.

Keywords
Photocatalysis; TiO2; Sulfonylurea; Iodosulfuron; Photocatalytic degradation; Identification; HPLC–MS; HPLC–NMR
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Iodosulfuron degradation by TiO2 photocatalysis: Kinetic and reactional pathway investigations
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 71, Issues 3–4, 15 February 2007, Pages 279–290
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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
Full-text PDF Download
Online Support
Any Questions? feel free to contact us