1,4-二氯苯在乙腈-水两相系统中的电化学氧化降解途径  

Degradation pathways of 1,4-dichlorobenzene by electrochemical oxidation on platinum electrodes in acetonitrile-aqueous two-phase system

作　　者：刘奇[1] 宋欣欣[1] 王家德[1] 陈钰[1] 陈建孟[1] 

机构地区：[1]浙江工业大学环境工程研究中心,浙江杭州310032

出　　处：《化工学报》2010年第2期450-454,共5页CIESC Journal

基　　金：教育部科学技术研究重点项目(208055)~~

摘　　要：研究了乙腈-水两相中Pt电极上1,4-二氯苯的降解途径和氧化特性。实验结果表明,1,4-二氯苯在乙腈-水两相中的氧化电位区间约为2.0～2.3 V(vs SCE),且氧化反应是受扩散控制的不可逆过程。液相色谱、液相色谱-质谱联用、离子色谱等的分析结果表明,乙腈-水两相中1,4-二氯苯氧化中间产物包括对氯苯酚、对苯醌、2,5-二氯对苯醌、草酸根离子、乙酸根离子、甲酸根离子、顺丁烯二酸根离子和氯离子,最终产物为H_2O和CO_2。得出了1,4-二氯苯主要的降解途径有两种。The anodie oxidation of 1,4-dichlorobenzene in acetonitrile-aqueous solution was investigated on a platinum electrode. The cyclic voltammetric （CV） profiles showed that the oxidation potential region of 1,4-dichlorobenzene was about 2.0--2.3 V （vs SCE） . Moreover, the effect of different scan rates on CV curves implied that oxidation reaction of 1,4-dichlorobenzene was controlled by diffusion process. Additionally, the major intermediates detected by liquid chromatography （LC） and liquid chromatography/mass spectrometry （LC/MS） were parachlorophenol, 1,4-benzoquinone and 2,5-dichloro- p-benzoquinone. The variation of the concentrations of related anions （oxalate, acetate, formate, maleate and chloride ion） during the reaction process was ascertained by ion chromatography （IC） . On the basis of these findings, two tentative degradation pathways, hydroxyl radical attacking of the atom of carbon inbenzene ring and dechlorination of 1,4-dichlorobenzene were described.

关 键 词：1  4-二氯苯 PT电极 电化学氧化 乙腈-水 

分 类 号：O646[理学—物理化学]