Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/11223
Title: Removal of phenylurea herbicide monuron via riboflavin-mediated photosensitization
Authors: Chu, W 
Chan, KH
Jafvert, CT
Chan, YS
Keywords: Model
Monuron
Optimal dose
Photosensitizer
Riboflavin
Issue Date: 2007
Publisher: Pergamon Press
Source: Chemosphere, 2007, v. 69, no. 2, p. 177-183 How to cite?
Journal: Chemosphere 
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] 0 and the doses of Rf.
URI: http://hdl.handle.net/10397/11223
ISSN: 0045-6535
EISSN: 1879-1298
DOI: 10.1016/j.chemosphere.2007.04.055
Appears in Collections:Journal/Magazine Article

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