Comparison of Diuron degradation by direct UV photolysis and advanced oxidation processes

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• 作者：Kamel Ezzine Djebbar ; Abdennour Zertal ; Nadra Debbache ; Tahar Sehili
• 关键词：Diuron ; Aqueous solution ; Hydrogen peroxide ; Fe(III) ; ^; //www.sciencedirect.com/scidirimg/entities/rad"" alt=""radical dot"" title=""radical dot"" border=""0"">OH ; UV ; Ferrioxalate
• 刊名：Journal of Environmental Management
• 出版年：2008
• 出版时间：September 2008
• 年：2008
• 卷：88
• 期：4
• 页码：1505-1512
• 全文大小：252 K

文摘

The rates of Diuron elimination by some advanced oxidation processes (AOPs) such as Fe(III)/UV, Ferrioxalate/UV, Fe(III)/H₂O₂/UV, Ferrioxalate/UV/H₂O₂ and Fe(III)/H₂O₂ have been compared. Experiments have been conducted at pH=2.3±0.1 with a batch reactor equipped with a low-pressure mercury lamp emitting mainly at 253.7 nm. Data obtained under the following experimental conditions ([H₂O₂]₀=10⁻³ M, [Diuron]₀=5×10⁻⁵ M and [Fe(III)]₀=10⁻³ M) have shown that rates of Diuron oxidation were higher with the systems Fe(III)/H₂O₂/UV and Ferrioxalate/UV/H₂O₂ than with Fe(III)/UV and Fe(III)/H₂O₂. On the other hand, Fe(III)/UV was found to be very efficient in mineralization of Diuron solution in comparison to direct UV photolysis. The experimental results showed that radical OH is the major pathway in the process of Diuron degradation.