Pd-Ni/GC电极电化学还原水中三氯甲烷的研究  

Electrochemically Reductive Dechlorination of Chloroform in Aqueous Medium by Codeposited Palladium-Nickel Glassy Carbon as Cathode

作　　者：孙治荣[1] 李保华[1] 胡翔[2] 石敏[1] 彭永臻[1] 

机构地区：[1]北京工业大学北京市水质科学与水环境恢复工程重点实验室,北京100022 [2]北京化工大学化学工程学院,北京100029

出　　处：《环境科学》2008年第5期1249-1254,共6页Environmental Science

基　　金：北京市科技新星计划项目(H013610070112);北京市属市管高等学校人才强教计划项目;北京市教育委员会科技计划项目;教育部留学回国人员基金项目

摘　　要：通过电沉积法在玻碳板(GC)电极上负载钯镍双金属,并利用正交实验对其进行循环伏安(CV)研究.CV结果表明,钯镍双金属比钯、镍单金属具有更大的氢吸附峰值,可以在-500 mV(以Hg/Hg2SO4为参比电极)左右获得-24.83 mA的氢吸附峰.扫描电镜分析(SEM)表明,镍的加入改变了钯颗粒在GC表面的分布形态,钯镍双金属颗粒形貌明显不同于钯、镍单金属颗粒,钯镍双金属颗粒粒径介于钯、镍单金属颗粒粒径之间.实验考察了脱氯电流、脱氯时间对三氯甲烷去除率的影响.三氯甲烷的去除率随脱氯电流的增大而增大,随脱氯时间的延长而提高.在优化条件下制备的Pd-Ni/GC电极在0.5 mA、180 min的脱氯条件下对三氯甲烷的去除率为42.53%.可以推测,随着脱氯时间的继续延长,三氯甲烷去除率可得到进一步提高.The electrochemical deposition behaviors of Pd-Ni bimetal on glassy carbon （GC） electrode were studied by means of cyclic voltammetry （CV） based on orthogonal experiments. CV results reveal that Pd-Ni bimetal shows larger hydrogen adsorption peak than that of single Pd or Ni. The mixture of Ni^2＋ and Pd^2＋ can get hydrogen adsorption peak of - 24.83 mA at - 500 mV （vs Hg/Hg2SO4 ）. Scanning Electron Microscope （SEM） images reveal that nickel addition changes the distributing configuration of Pd microparticles on GC. And the appearance of Pd-Ni bimetal microparticles is distinctly different from that of single Pd and single Ni microparticles. Diameter of Pd-Ni microparticle is bigger than that of Pd microparticle and smaller than that of Ni microparticle. Effects of dechlorination current and time on removal efficiency of chloroform were also studied. The removal efficiency of chloroform increases at higher dechlorination current and longer dechlorination time. It reaches 42.53% when the dechlorination current and time are 0.5 mA and 180 min respectively on Pd-Ni/GC electrode prepared at optimum conditions. It can be envisioned that the removal efficiency of chloroform would increase further at longer dechlorination time.

关 键 词：Pd-Ni/GC 三氯甲烷 脱氯 电化学 循环伏安 

分 类 号：X52[环境科学与工程—环境工程] X703.1