镍/铁和铜/铁双金属降解四氯乙烯的研究  

DEGRADATION OF PCE USING Ni/Fe AND Cu/Fe BIMETAL SYSTEMS

作　　者：何小娟[1] 汤鸣皋[1] 李旭东[1] 徐鹏[1] 

机构地区：[1]中国地质大学水资源与环境学院,北京100083

出　　处：《环境化学》2003年第4期334-339,共6页Environmental Chemistry

基　　金：国家自然科学基金资助项目 (No. 40 0 72 0 80;No. 40 1 42 0 0 9)

摘　　要：选用镍 /铁和铜 /铁双金属对四氯乙烯 (PCE)进行脱氯试验 .结果表明 ,双金属系统对四氯乙烯有明显的脱氯作用 ,且脱氯反应符合准一级反应动力学方程 ,双金属在降解PCE的过程中 ,无三氯乙烯 (TCE)、二氯乙烯 (DCE)和氯乙烯 (VC)等中间产物形成 ,与零价铁系统相比 ,双金属系统对PCE的降解速率有明显提高 ,尤其是Ni/Fe双金属 ,反应速率常数kSA从 0 1 2 89ml·m- 2 ·h- 1 提高到 0 3697ml·m- 2 ·h- 1 ,Cu/Fe双金属的反应速率常数kSA为 0 2 2 79ml·m- 2 ·h- 1 .无论是哪种反应介质 。Ni/Fe and Cu/Fe bimetal were used to dechlorinate tetrachloroethene(PCE).The results show that bimetal systems were effective to the dechlorination of tetrachloroethene and the reactions followed first order equation.No intermediate products such as TCE,DCE and VC were detected during reaction.Compared with zero valent iron system,bimetal systems enhanced dechlorination rate significantly,especially for Ni/Fe system.The reaction rate constant( k SA )was increased from 0 1289ml·m -2 ·h -1 for zero valent iron system to 0 3697ml·m -2 ·h -1 for Ni/Fe and to 0 2279ml·m -2 ·h -1 for Cu/Fe.No mater what material reacted,drying in the preparation process strongly affected the dechlorination rate.

关 键 词：镍 铁 铜 降解 四氯乙烯 PCE 脱氯 双金属系统 

分 类 号：O621.25[理学—有机化学]