钯负载泡沫镍电极电化学还原三氯乙酸的影响因素  

Investigation of electrolytic reduction of tichloroacetic acid in aqueous solution by Pd-loaded Ni foam electrode

作　　者：荣文娜 赵晨 赵小彤[1] 杨海明[1] 

机构地区：[1]辽宁科技大学化学工程学院,辽宁鞍山114051

出　　处：《辽宁科技大学学报》2017年第4期265-269,共5页Journal of University of Science and Technology Liaoning

基　　金：国家自然科学基金青年基金(51308276;51102126);辽宁省教育厅优秀人才项目(2015055);辽宁省博士启动基金项目(20141123);鞍山市科技计划项目(No.2961);辽宁省高等学校创新团队(LT2014007);2015年辽宁省自然科学基金计划项目(2015020634)

摘　　要：采用非电沉积法制备的钯负载泡沫镍电极作为阴极,直径0.6 mm的铂丝作为阳极,对三氯乙酸进行恒电流电化学还原脱氯研究。考察了初始物不同浓度,pH值和钯负载泡沫镍电极片三个因素对三氯乙酸降解反应的影响,并采用扫描电镜(SEM)方法对制备的钯负载泡沫镍电极进行了表征。实验中发现不同条件下三氯乙酸的还原去除率均可达到90%以上。当反应条件为20 mmol/L硫酸钠为电解质,钯负载量4.5 mg/cm2,温度为20℃,10 m A恒电流电解240 min时,初始浓度为9 mg/L,pH=2.5时三氯乙酸降解率达99.6%,其效果最佳。The electrochemical reduction of trichloroacetic acid（TCA） by Pd-loaded Ni foam electrode was investigated in this paper. The Pd-loaded Ni cathodes were prepared using the platinum wire anode of 0.6 mm diameter by electroless deposition. The effects of initial pH,initial concentrations of TCA,and stability of Pd/Ni cathode were investigated. The characteristics of the Pd-loaded Ni foam were also investigated by SEM.The removal rates of TCA were above 90%. The best removal rate of TCA reached 99.6% under the condition：20 m M sodium sulfate as electrolyte,the temperature of 20 ℃,the quantity of Pd-loading of 4.5 mg/cm2,the constant current of 10 m A and reduction time of 4 h.

关 键 词：三氯乙酸 钯负载 泡沫镍 电还原 

分 类 号：X703.1[环境科学与工程—环境工程]