Photo-Fenton degradation of alachlor in the presence of citrate solution
Photo-Fenton degradation of alachlor in the presence of citrate solution
复制标题
DOI：
10.1016/j.jphotochem.2005.09.013
复制
发表时间：
2006-05-15
影响因子：
4.3
通讯作者：
Yobiko, Yoshihiro
中科院分区：
文献类型：
--
作者：
Katsumata, Hideyuki;Kaneco, Satoshi;Yobiko, Yoshihiro
研究了在柠檬酸盐存在下，芬顿试剂（Fe（II）和H2 O2）对乙酰苯胺类除草剂甲草胺的光催化降解。pH值、H2 O2、Fe（II）和柠檬酸盐的初始浓度对降解速率有很大影响。在最佳条件下，初始浓度为10 mg L-1的甲草胺在pH 5下降解10 min后完全降解。因此，柠檬酸盐的存在有可能扩大光Fenton反应的pH范围。在柠檬酸盐作用下，甲草胺的矿化导致总有机碳（TOC）的降低。紫外光照射26 h后，甲草胺的矿化度约为100%.在光催化反应过程中，氯离子、硝酸根离子和铵离子作为最终产物生成。甲草胺的分解反应产生了7种中间产物。根据已鉴定的中间体，提出了甲草胺的降解机理。因此，UV/Fe（II）-柠檬酸盐/H_2O_2体系可作为处理含甲草胺废水的有效技术。(c)2005 Elsevier B. V.保留所有权利。
The photodegradation of alachlor, which is one of acetanilide herbicides, was carried out in the presence of the Fenton reagent (Fe(II) and H2O2) and citrate. The degradation rate was strongly influenced by the pH, and initial concentrations of H2O2, Fe(II) and citrate. An initial alachlor concentration of 10 mg L-1 was completely degraded after 10 min at pH 5 under the optimum conditions. Therefore, it was possible to extend available pH range of the photo-Fenton reaction by the existence of the citrate. The decrease of total organic carbon (TOC) as a result of mineralization of alachlor was observed during the photo-Fenton process with citrate. The degree of alachlor mineralization was about 100% under UV irradiation after 26 h. The formations of chloride, nitrate and ammonium ions as end-products were observed during the photocatalytic system. The decomposition of alachlor gave seven kinds of intermediate products. The degradation mechanism of alachlor was proposed on the base of the evidence of the identified intermediates. Based on these results, UV/Fe(II)-citrate/H2O2 system could be useful technology for the treatment of wastewater containing alachlor. (c) 2005 Elsevier B.V. All rights reserved.