氟掺杂Ti/SnO_2电极电催化降解全氟辛酸性能研究  

Efficient Electrochemical Oxidation of PFOA by F-doped Ti/SnO_2 Anode

作　　者：蒋超金 谭人豪 李静[1] 卓琼芳[3] 杨波[1] 

机构地区：[1]深圳大学化学与环境工程学院,广东深圳518060 [2]深圳市红岭中学G316班,广东深圳518049 [3]环境保护部华南环境科学研究所,广东广州510000

出　　处：《环境科学与技术》2016年第7期114-117,134,共5页Environmental Science & Technology

基　　金：国家"863"项目(2013AA062705);国家自然科学基金项目(21177089;11275130);广东省自然科学基金(2014A030313761)

摘　　要：采用溶胶-凝胶法制备Ti/Sn O_2-F电极,进行全氟辛酸(PFOA)电氧化降解的研究,实验考察了F替代Sb掺杂、电流密度、初始pH值和支持电解质对PFOA降解效率的影响。结果表明,当F替代Sb掺杂Sn O_2,电流密度为20 m A/cm^2,初始pH值3.7,支持电解质为NaClO_4时,电解30 min后PFOA的降解率达98%。采用液相色谱-质谱联用(HPLC-MS/MS)和离子色谱(IC)对PFOA降解产物进行分析,解析了PFOA电氧化降解的反应机理。F-doped Ti/SnO2 electrode was prepared by a sol-gel process,which was used to explore the electrochemical decomposition of the persistent perfluorooctanoic acid（PFOA） in this study. The effects of using F or Sb dopant,current density,p H,and electrolyte type on the removal rate of PFOA were investigated. The results showed that under the optimal conditions,namely using F dopant,current density at 20 m A/cm^2,initial p H 3.7 and using NaClO4 as the electrolyte,the removal rate of PFOA could reach 98% after 30 min electrolysis. With the analysis of HPLC-MS/MS and IC, the intermediate products of PFOA were detected after electrooxidation. Finally,the electrochemical degradation pathway of PFOA was proposed according to the intermediate analysis.

关 键 词：Ti/Sn O2-F电极 电催化降解 全氟辛酸 

分 类 号：X132[环境科学与工程—环境科学]