Effects of operating parameters on advanced oxidation of diuron by the Fenton’s reagent: A statistical design approach

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• 作者：Ebru Cokay Catalkaya ; Fikret Kargi
• 关键词：Advanced oxidation ; Box-Behnken design ; Diuron ; Fenton reagent ; Operating conditions
• 刊名：Chemosphere
• 出版年：2007
• 期刊代码：15_00456535
• 类别：env
• 出版时间：September 2007
• 卷：69
• 期：3
• 页码：485-492
• 文件大小：191 K

摘要

Advanced oxidation of diuron in aqueous solution by Fenton’s reagent using FeSO₄ as source of Fe(II) was investigated in the absence of light. Effects of operating parameters namely the concentrations of pesticide (diuron), H₂O₂ and Fe(II) on oxidation of diuron was investigated by using Box-Behnken statistical experiment design and the surface response analysis. Diuron oxidation by the Fenton reagent was evaluated by determining the total organic carbon (TOC), diuron, and adsorbable organic halogen (AOX) removals. Concentration ranges of the reagents resulting in the highest level of diuron oxidation were determined. Diuron removal increased with increasing H₂O₂ and Fe(II) concentrations up to a certain level. Diuron concentration had a more profound effect than H₂O₂ and Fe(II) in removal of diuron, TOC and AOX from the aqueous solution. Nearly complete (98.5%) disappearance of diuron was achieved after 15 min reaction period. However, only 58%of diuron was mineralized after 240 min under optimal operating conditions indicating formation of some intermediate products. Optimal H₂O₂/Fe(II)/diuron ratio resulting in the maximum diuron removal (98.5%) was found to be 302/38/20 (mg l⁻¹).