电Fenton试剂助TiO_2可见光催化降解水中的特丁津  

Degradation of terbuthylazine by TiO_2 visible photocatalysis with electro-generated Fenton reagent assistance

作　　者：唐建军[1] 陈益清[1] 蒋涛[2] 杨声海[2] TANG Jian-jun;CHEN Yi-qing;JIANG Tao;YANG Sheng-hai(School of Construction and Environmental Engineering, Shenzhen Polytechnic, Shenzhen 518055, China;School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China)

机构地区：[1]深圳职业技术学院建筑与环境工程学院,广东深圳518055 [2]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《中国环境科学》2016年第11期3304-3310,共7页China Environmental Science

基　　金：广东省自然科学基金(9151018201000029);深圳市科技计划项目(JCYJ20140508155916429)

摘　　要：以网状铱钽钛涂层电极为阳极、石墨板为阴极,设计了一种在线生成H_2O_2的电化学反应器,并研究了电Fenton试剂(电生H_2O_2及Fe^3+)助TiO2可见光催化降解特丁津的情况.结果表明:电化学法在线生成H_2O_2能助TiO^2可见光催化降解特丁津,反应180min降解率近100%;而以Fe^3+协同TiO_2则显著加快反应速率,反应30min降解率达100%;特丁津的降解始于脱氯,然后脱特丁基、乙基、氨基;通过对反应体系的光谱分析显示,特丁津的降解涉及羟基自由基(·OH)及超氧自由基(·O_2^-)的产生与参与.A electro-chemical reactor with H2O2 in-situ generation was designed, which using net structure Ir_Ta oxidecoated Ti metal as anode, and platelike graphite as cathode, the degradation of terbuthylazine by TiO2 visible-lightphotocatalysis with electro-generated Fenton reagent (electrogenerated H2O2 and Fe3+) assiatance was also studied.Terbuthylazine could be degraded by TiO2 visible-light photocatalysis with electrogenerated H2O2 assiatance, and thedegradation ratio could be 100% after 180 min reaction. Snergistic degradation of terbuthylazine was evidently fast whenadditionally adding Fe3+, its degradation ratio could be 100% after 30 min reaction. In the degradation process ofterbuthylazine, dechlorination was first carried out, and tert-butyl, ethyl, amino groups were then oxidized. Spectrumanalysis indicated that the reaction process was predominated by the hydroxyl free radical (·OH) and superoxide radical(·O2-) generation in the system.

关 键 词：可见光催化 电Fenton试剂 特丁津 羟基自由基 超氧自由基 

分 类 号：X703[环境科学与工程—环境工程]