介质阻挡放电处理水中3,4-二氯苯胺机理研究  

Dielectric barrier discharge induced degradation of 3,4-dichloroaniline in aqueous solution

作　　者：王卫平[1] 郑正[1] 罗艳[1] 徐志荣[2] 冯景伟[3] 张继彪[1] 

机构地区：[1]污染控制与资源化研究国家重点实验室、南京大学环境学院,南京210093 [2]河海大学环境学院,南京210098 [3]合肥工业大学土木与水利工程学院,合肥230001

出　　处：《环境科学学报》2010年第3期524-529,共6页Acta Scientiae Circumstantiae

基　　金：水体污染控制与治理科技重大专项课题(No2008ZX07101-004)~~

摘　　要：采用介质阻挡放电产生低温等离子体来处理水中3,4-二氯苯胺(3,4-DCA),考察了放电功率、空气流量、金属离子(Fe2+、Cu2+)浓度、光催化剂二氧化钛对3,4-DCA去除率的影响,并分析了降解产物及可能的降解机理.实验结果表明,介质阻挡放电方法对3,4-DCA有良好的去除效果,在3,4-DCA初始浓度为30mg·L-1,放电功率为80W,空气流量为1L·min-1时,放电处理6min后3,4-DCA的去除率可达92.5%.增加空气流量能显著地提高3,4-DCA的去除率,添加亚铁离子(Fe2+)浓度和光催化剂TiO2均能提高3,4-DCA的去除率,且存在最佳添加量值.介质阻挡放电方法对3,4-DCA的降解去除反应符合一级反应动力学.通过气质联用仪(GC-MS)分析检测发现,反应主要为脱氯、脱氨基和苯环开环反应,二氯乙烯为其主要的降解产物.In this study,non-thermal plasma produced by dielectric barrier discharge（DBD） was adopted to remove the 3,4-DCA in water.The effects of discharge power,air flow rate,metal ions（Fe2＋,Cu2＋） and titanium dioxide photocatalyst on the removal efficiency of 3,4-DCA were tested and the byproducts and possible decomposition mechanism were analyzed.The experimental results showed that the DBD method has a favorable removal efficiency for 3,4-DCA.About 92.5% can be removed after 6 min DBD decomposition with 30 mg·L^ -1 initial concentration,80 W discharge power and 1 L·min^ -1 air flow rate.The removal rate of 3,4-DCA increases significantly with the increase of air flow rate,while adding a certain amount of ferrous ion（Fe^2＋） and TiO2 photocatalyst can also increase the removal rate of 3,4-DCA.The degradation reaction of 3,4-DCA by DBD can be described by first-order reaction kinetics.Dechlorination,deamination and aromatic ring-opening reactions were found to be the major reactions and ethylene dichloride was found to be the major degradation product.

关 键 词：介质阻挡放电 3 4-二氯苯胺 去除率 

分 类 号：X703[环境科学与工程—环境工程]