Ni/Fe双金属降解CCl_4、CHCl_3和CH_2Cl_2的试验  

Comparison of the Degradation of CT and PCE by Ni/Fe Bimetal

作　　者：何小娟[1] 李旭东[2] 沈照理[3] 周琪[1] 

机构地区：[1]同济大学环境科学与工程学院,上海200092 [2]上海交通大学农业与生物学院,上海201101 [3]中国地质大学水资源与环境学院,北京100083

出　　处：《净水技术》2007年第3期11-15,共5页Water Purification Technology

基　　金：国家自然科学基金项目(40072080;40142009)

摘　　要：在批试验条件下研究了Ni/Fe双金属对CCl4(CT)、CHCl3(TCM)和CH2Cl2(DCM)的还原性脱氯性能。结果表明:(1)Ni/Fe双金属可有效对CT和TCM脱氯,但对DCM没有脱氯效果;(2)Ni/Fe双金属对CT和TCM的降解反应均符合准一级反应动力学方程;(3)在相似的反应条件下,Ni/Fe双金属对CT和TCM的脱氯效果好于Fe0,且脱氯速度与Ni/Fe质量比在一定数值范围内成正比;(4)对CT和TCM脱氯的反应速率常数kSA相差10.98～16.60倍,说明Ni/Fe双金属对氯代程度高的CT脱氯快于对氯代程度低的TCM;(5)Ni/Fe双金属对CT脱氯过程产生TCM,不产生DCM,且随着反应时间的继续,产生的TCM也继续被降解;而Ni/Fe双金属对TCM脱氯并不逐级产生DCM;Fe0对CT脱氯不仅产生TCM,也产生DCM。Carbon tetrachloride （CT）, chloroform （TCM） and dichloromethane （DCM） were selected as target contaminants in this paper. Batch experiments were conducted to determine the reductive dechlorination of CT, TCM and DCM by Ni/Fe bimetal. The results show： （1）Ni/Fe bimetal scrapes were effective in the dechlorination of CT and TCM, but was invalid to DCM;（2）The dechlorination reactions of CT and TCM by Ni/Fe bimetal were pseudo first order;（3）Compared with Fe^0, Ni/Fe bimetal was more efficient in the dechlorination of CT and TCM at similar reaction conditions, and at some range of Ni/Fe mass ratio, the bigger the Ni/Fe mass ratio, the quicker the reaction rate was;（4）The dechlorination rate （kSA） of CT was 10.98-16.60 times bigger than that of TCM at similar reaction conditions, evidently showing that CT degraded more quickly than TCM in Ni/Fe bimetal system; （5）TCM was detected during the dechlorination of TCM by Ni/Fe bimetal and then continued to be slowly degraded, but DCM was not detected either in CT or TCM dechlorination by Ni/Fe bimeta, showing that TCM was not dechlorinated to DCM step by step. Both TCM and DCM were detected in the dechlorination of CT by Fe^0.

关 键 词：四氯化碳 三氯甲烷 二氯甲烷 Ni/Fe双金属 还原性脱氯 

分 类 号：TQ323.41[化学工程—合成树脂塑料工业]