期刊
CHEMOSPHERE
卷 87, 期 8, 页码 954-961出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2012.01.056
关键词
Water detoxification; Sulfonylurea herbicides; Photocatalytic oxidation; Semiconductor materials
资金
- Ministerio de Espana de Ciencia e Innovacion [AGL2010-20458-C02-01]
- Ramon and Cajal Subprogram
- Instituto Nacional de Investigacion y Tecnologia Agraria y Alimentaria [RTA2011-00022-00-00]
In the present study, the photocatalytic degradation of five sulfonylurea herbicides (chlorsulfuron, flazasulfuron, nicosulfuron, sulfosulfuron and triasulfuron) has been investigated in aqueous suspensions of zinc oxide (ZnO), tungsten (VI) oxide (WO3), tin (IV) oxide (SnO2) and zinc sulfide (ZnS) at pilot plant scale under natural sunlight. Photocatalytic experiments, especially those involving ZnO photocatalysis, showed that the addition of semiconductors in tandem with the oxidant (Na2S2O8) strongly enhances the degradation rate of the herbicides in comparisons carried out with photolytic tests. The degradation of the herbicides follows a first order kinetics according to the Langmuir-Hinshelwood model. In our conditions, the amount of time required for 50% of the initial pesticide concentration to dissipate (GO ranged from 8 to 27 min (t(30w) = 0.3-1.2 min) for sulfosulfuron and chlorsulfuron, respectively in the ZnO/Na2S2O8 system. None of the studied herbicides was found after 120 min of illumination (except chlorsulfuron, 0.2 mu g L-1). (C) 2012 Elsevier Ltd. All rights reserved.
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