Comparison of advanced oxidation processes and identification of monuron photodegradation products in aqueous solution

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• 作者：MariaBobu ; Steven Wilson ; Tyge Greibrokk ; Elsa Lundanes and Ilie Siminiceanu
• 关键词：Photo-Fenton reaction ; Monuron ; μ ; -LC– ; MS ; μ ; -LC– ; UV ; TiO₂ photocatalysis ; Chlorophenylurea herbicides
• 刊名：Chemosphere
• 出版年：2006
• 出版时间：June 2006
• 年：2006
• 卷：63
• 期：10
• 页码：1718-1727
• 全文大小：215 K

文摘

The photodegradation of monuron (3-(4-chlorophenyl)-1,1-dimethylurea) in aqueous solutions under simulated solar irradiation has been conducted by different advanced oxidation processes (UV/H₂O₂, UV/H₂O₂/Fe²⁺, UV/H₂O₂/TiO₂, UV/TiO₂, dark H₂O₂/Fe³⁺). The degradation rates were always higher for the homogeneous catalysis in photo-Fenton reactions (UV/H₂O₂/Fe²⁺) compared to the heterogeneous photocatalytic systems (TiO₂/UV and UV/H₂O₂/TiO₂). Optimal concentrations of Fe²⁺ and H₂O₂ for the abatement of the herbicide in the photo-Fenton system were found to be 1 mM Fe(II) and 10 mM H₂O₂. Several intermediary products were identified using large volume injection micro-liquid chromatography with UV detection (μ-LC–UV), μ-LC–MS and GC–MS techniques and a degradation mechanism has been proposed.