Removal of phenylurea herbicide monuron via riboflavin-mediated photosensitization

Wei Chu, K. H. Chan, C. T. Jafvert, Yuk Sing Gilbert Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)

Abstract

Photodegradation of the phenylurea herbicide monuron by using riboflavin (Rf), a sensitizer, was investigated by varying the doses of monuron and Rf in this work. An enhanced photochemical effect was observed in the process compared with the direct photolysis by using UV irradiation only. The reaction time was greatly shortened from more than 60 min (direct photolysis) to 8-30 min depending on the doses of initial concentration of monuron ([M]0) and Rf. A modified hyperbola model was found to be useful to determine the reaction kinetics and thereafter the performance on the photodegradation of monuron sensitized by Rf. Two measurable characteristic constants (initial decay rate and total removal index) were used to quantify the reaction. The maximum removal difference compared with the direct photolysis and Rf-sensitization was investigated. It was found that the improvement of the process depended on both the [M]0and the doses of Rf.
Original languageEnglish
Pages (from-to)177-183
Number of pages7
JournalChemosphere
Volume69
Issue number2
DOIs
Publication statusPublished - 1 Sep 2007

Keywords

  • Model
  • Monuron
  • Optimal dose
  • Photosensitizer
  • Riboflavin

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemistry(all)

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