Kinetics of Fenuron Decomposition by Single-Chemical Oxidants and Combined Systems

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• 作者：Juan L. Acero ; F. Javier Benitez ; Manuel Gonzalez ; and Rosalí ; a Benitez
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2002
• 出版时间：August 21, 2002
• 年：2002
• 卷：41
• 期：17
• 页码：4225 - 4232
• 全文大小：139K
• 年卷期：v.41,no.17(August 21, 2002)
• ISSN：1520-5045

文摘

The decomposition of fenuron (1,1-dimethyl-3-phenylurea), a herbicide regarded as a prioritypollutant, was carried out in batch reactors by means of ozone, UV radiation, and Fenton'sreagent as single oxidants and by the advanced oxidation processes formed by the followingcombinations: UV radiation plus H₂O₂, UV radiation plus Fenton's reagent (photo-Fentonsystem), ozone plus UV radiation, and ozone plus UV radiation and H₂O₂. In all cases, thedecomposition levels were determined and the apparent pseudo-first-order rate constants wereevaluated by linear regression to compare the efficiencies of the processes. The rate constantsfor the reactions of fenuron with ozone and with hydroxyl radicals were determined as well asthe efficiencies for the photodecomposition by direct UV radiation. Finally, in the combinedsystems, the contributions to the overall decomposition caused by the radical reactions wereestablished by calculating the radical rate constants.