钯/泡沫镍电极对水体中2-氯联苯的电催化脱氯作用  

Electrocatalytic dechlorination of 2-chlorobiphenyl in aqueous solution using Pd modified Ni foam electrode

作　　者：王姝[1] 杨波[1] 余刚[1] 

机构地区：[1]清华大学环境科学与工程系,持久性有机污染物研究中心,北京100084

出　　处：《中国环境科学》2008年第6期522-526,共5页China Environmental Science

基　　金：国家自然科学基金资助项目(20707011);中国博士后科学基金项目(20070410069)

摘　　要：采用两室流通式隔膜电解池,研究了钯修饰泡沫镍电极对纯水相中2-氯联苯(2-CB)的电催化还原脱氯作用,考察了电流密度、pH值和溶液流速对2-CB脱氯率的影响.结果表明,当电流密度为1.5mA/cm2、阴极液pH值为5.5、阴极液流速为7.4mL/(min·cm2)时,脱氯反应30min,2-CB脱氯率达91.4%.脱氯产物包括联苯和苯基环己烷,根据脱氯过程碳平衡关系可确定该过程为逐步氢化反应.Electrocatalytic dechlorination of 2-chlorobiphenyl （2-CB） in aqueous solution was studied in a membrane-separated two-compartment electrochemical reactor using Pd modified Ni foam electrode. The influence of current density, cathode solution pH value and flow rate on 2-CB dechlorination effect were inspected. Moderate current density （1.5mA/cm^2）, relatively low cathode solution pH value （5.5） and high flow rate [7.4mL/（min·cm^2）] were beneficial to improve the dechlorination efficiency of 2-CB. Under the optimized conditions, 91.4% of 2-CB was dechlorinated within 30min. The dechlorination products included biphenyl and cyclohexylbenzene. Based on the carbon balance analysis, the above dechlorination process could be determined being gradual hydrogenation reaction.

关 键 词：钯 泡沫镍电极 2-氯联苯 电催化脱氯 

分 类 号：X52[环境科学与工程—环境工程]