Journal
CHEMOSPHERE
Volume 86, Issue 11, Pages 1079-1086Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2011.11.062
Keywords
Monuron; WO3; Oxidation mechanism; Decay pathway
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Funding
- Hong Kong Polytechnic University [GU-709]
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A comprehensive study of the degradation of monuron, one of the phenylurea herbicides, was conducted by UV-VisWO(3) process. It was found that hydroxyl radicals played a major role in the decay of monuron while other radicals (e.g. superoxide) and hole might also contribute to the decomposition of monuron. The oxidation path likely plays a major role in the generation of hydroxyl radicals. The effects of initial pH level, initial concentration of monuron, and inorganic oxidants on the performance of UV-Vis/WO3 process were also investigated and optimized. Comparison between monuron decay pathways by UV-Vis/WO3 and UV/TiO2 was conducted. The decay mechanisms, including N-terminus demethylation, dechlorination and direct hydroxylation on benzene ring, were observed to be involved in the oxidation of monuron in these two processes. Sixteen intermediates were identified during the photodegradation of monuron and degradation pathways were proposed accordingly. (c) 2011 Elsevier Ltd. All rights reserved.
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