卟啉锰电催化还原降解滴滴涕  

Electrocatalysis reductive degradation of DDT using manganese porphyrins

作　　者：朱卫华[1] 沈薇[1] 房媛媛[1] 张英[1] 欧忠平[1] 

机构地区：[1]江苏大学化学化工学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2011年第2期227-231,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：江苏省自然科学基金资助项目(BK2008226);江苏大学高级人才基金资助项目(05JDG051)

摘　　要：利用循环伏安及紫外-可见光谱电化学方法,研究了八乙基卟啉锰和四苯基卟啉锰在DMF中电还原降解滴滴涕(DDT)的催化性质.结果表明,中性和第1级还原的卟啉锰对DDT的降解无催化作用,而第2级和第3级电还原的配合物均能催化DDT的降解反应.利用控制电位技术,以卟啉锰为电催化剂,对DDT进行了还原降解,利用气相色谱-质谱联用技术对降解产物进行了分析鉴定.在试验条件下,DDT降解的主要产物为1,1-二(4-氯苯基)-2,2-二氯乙烷(DDD),1,1-二(4-氯苯基)-2,2-二氯乙烯(DDE)和1,1-二(4-氯苯基)-2-氯乙烯(DDMU).根据试验结果提出了卟啉锰配合物电催化还原降解DDT的机理.The catalytic properties of octaethylporphyrin and tetraphenylporphyrin manganese complexes on degradation of DDT were examined by cyclic voltammetry and UV-visible spectroelectrochemistry in DMF.No catalytic reaction was observed for DDT by neutral and first reduced manganese porphyrins,but both doubly and triply reduced complexes can catalyze the degradation of DDT.The electroreductive de-gradation of DDT was performed by using a technique of controlled-potential electrolysis and manganese porphyrins as the electrocatalysts.The products of DDT degradation were analyzed and characterized by the GC-MS technique.The main products of DDT degradation are DDD（1,1-bis（4-chlorophenyl）-2,2-dichloroethane）,DDE（1,1-bis（4-chlorophenyl）-2,2-dichloroethylene） and DDMU（1,1-bis（4-chlorophenyl）-2-chloroethylene） under the given experimental conditions.Based on the experimental results,a mechanism for reductive degradation of DDT catalyzed by manganese porphyrins was proposed.

关 键 词：卟啉锰配合物 滴滴涕 电催化还原 控制电位电解 降解机理 

分 类 号：X592[环境科学与工程—环境工程]