阴极原位产H2O2强化光电催化降解水中EDTA的研究  

In-situ generation of H_2O_2 in cathode to enhance the photoelectrocatalytic degradation of EDTA in water

作　　者：陈禹彤[1,2] 张秀芳[1] 田世超[2] 王雁[2] 刘珊珊[2] 赵旭[2] CHEN Yutong ZHANG Xiufang TIAN Shichao WANG Yan LIU Shanshan ZHAO Xu(School of Light Industry＆Chemical Engineeine, Dalian Polytechnic University, Dalian 116034 Key Laboratory of Aquatic Science and Technology, Research Center for Eeo-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085)

机构地区：[1]大连工业大学,轻工与化学工程学院,大连116034 [2]中国科学院生态环境研究中心,环境水质学实验室,北京100085

出　　处：《环境科学学报》2017年第3期971-976,共6页Acta Scientiae Circumstantiae

基　　金：格平绿色行动辽宁环境科研“123工程”资助(No.CEPF2014-123-2-18)~~

摘　　要：本研究构建了以活性碳纤维(Activated Carbon Fiber,ACF)为阴极,TiO_2/Ti与Ru O_2/Ti为双阳极的光电催化体系.该体系中,Ru O_2/Ti电阳极和TiO_2/Ti光阳极均有氧化作用,可同时氧化降解污染物;且电阳极具有较强析氧作用,能产生大量O_2;ACF阴极具有还原作用,可将体系中产生的O_2原位还原为H_2O_2;H_2O_2在紫外光下产生·OH,进而强化光电催化与电催化氧化过程,实现对水中乙二胺四乙酸二钠(EDTA)的高效去除.本论文详细考察了电流密度、pH、曝气等因素对EDTA降解效果的影响.结果表明,在EDTA初始浓度为300 mg·L^(-1)、溶液初始pH=4.84、电流密度为12 m A·cm^(-2)和光电流密度为0.012 m A·cm^(-2)的条件下,反应90 min后,EDTA降解率高于90%.该催化体系实现了EDTA的高效降解.A photoelectrocatalytic system using TiO2/Ti and Ru O2/Ti as bi-anode and activated carbon fiber（ ACF） as cathode was designed. In this system,both Ru O2/Ti electric anode and TiO2/Ti photo anode possess oxidation ability,and can degrade contaminants simultaneously. Meanwhile,the electric anode can produce large amounts of O2,which can be reduced to H2O2. Under UV irradiation,H2O2 transformed to ·OH,which can enhance the photoelectric catalytic and electric catalytic oxidation process,and subsequently realizing the efficient removal of EDTA. The effects of current density,initial pH and dissolved oxygen on the degradation performance of EDTA were investigated. The results indicated that over 90% EDTA were eliminated after 90 min when the initial concentration of EDTA was 300 mg·L^-1,current density was 12 m A·cm^-2,photo current density was 0.012 m A·cm^-2and initial pH was 4.84. This system realized the highly efficient degradation of EDTA.

关 键 词：光电催化 活性碳纤维 过氧化氢 乙二胺四乙酸二钠 

分 类 号：X703[环境科学与工程—环境工程]