Photocatalytic oxidation of monuron in the suspension of WO 3 under the irradiation of UV-visible light

Wei Chu, Y. F. Rao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

37 Citations (Scopus)

Abstract

A comprehensive study of the degradation of monuron, one of the phenylurea herbicides, was conducted by UV-Vis/WO3process. 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/WO3process were also investigated and optimized. Comparison between monuron decay pathways by UV-Vis/WO3and UV/TiO2was 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.
Original languageEnglish
Pages (from-to)1079-1086
Number of pages8
JournalChemosphere
Volume86
Issue number11
DOIs
Publication statusPublished - 1 Mar 2012

Keywords

  • Decay pathway
  • Monuron
  • Oxidation mechanism
  • WO 3

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemistry(all)

Cite this