光/电Fenton牺牲阳极法降解有机污染物  

Degradation of organic pollutants by photo/electro-Fenton sacrificial anode system

作　　者：刘栓[1] 朱建文[1] 王奇[1] 方艳芬[1] 黄应平[1] 

机构地区：[1]三峡大学AlanG.MaeDiarmid再生能源研究所,宜昌443002

出　　处：《环境工程学报》2010年第12期2699-2704,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(20877048);国家重点基础研究发展计划(973)项目前期研究课题(2008CB417206);湖北省优秀中青年团队研究项目资助(T200703)

摘　　要：采用Fe片为阳极和石墨为阴极,在可见光(λ>450 nm)照射并外加电压条件下,以有机染料橙Ⅱ(orangeⅡ)及有机无色小分子2,4-二氯苯酚(2,4-dichlorophenol,DCP)为目标化合物,探讨了光/电Fenton牺牲阳极法降解有机污染物的最佳反应条件,结果表明,在电压=3 V,pH=3.0,H2O2浓度为5×10-5mol/L时,orangeⅡ的降解效果最好,反应10 h矿化率可达到78%,210 min内2,4-DCP降解率为91.4%。通过对光/电Fenton体系原位循环伏安参数测定及过氧化物酶催化反应吸光光度法和苯甲酸荧光分析法检测光/电Fenton降解orange II过程中H2O2和羟基自由基(.OH)的变化,表明orangeⅡ降解过程涉及.OH历程。In this study,the degradation of organic pollutants（i.e.orange Ⅱ and 2,4-dichiprophenol（2,4-DCP）） was studied by sacrificial anode Fenton reaction,employing iron as anode and graphite as cathode under the irradiation of visible light（λ450 nm） and the addition of electricity.The results showed that the optimum conditions for the degradation of orange Ⅱ were additional voltage of 3 V,pH value of 3.0,and hydrogen peroxide concentration of 5×10-5 mol/L.Under these conditions,the mineralized rate for orange Ⅱ was 78% in 10 hours,and the degradation rate for 2,4-DCP was 91.4% in 210 min.In order to investigate the degradation mechanism of the target compound,the electrochemical characteristics of the electrode were determined by in situ cyclic voltammetry,and the variations of hydrogen peroxide and hydroxyl radical during the degradation were traced by enzyme catalysis method and fluorescence spectrometry.The results showed that the degradation process mainly involved hydroxyl radical course.

关 键 词：光/电-Fenton 可见光 .OH 橙Ⅱ 

分 类 号：X703[环境科学与工程—环境工程]