| Ag/Fe催化还原体系处理水体中氯代烃的研究 |
| 摘要点击 1743 全文点击 1374 投稿时间：2005-07-17 修订日期：2006-03-06 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 氯代烃 还原脱氯 催化还原 Ag/Fe催化还原体系 |
| 英文关键词 chlorinated hydrocarbons reductive dechlorination catalytic reduction Ag/Fe catalytic reduction system |
|
| 中文摘要 |
| 研究了水体中的三氯甲烷(CF)、四氯化碳(CT)、1,1,1-三氯乙烷(1,1,1-TCA)、1,1,2,2-四氯乙烷(1,1,2,2-TeCA)、六氯乙烷(HCA)、三氯乙烯(TCE)、四氯乙烯(PCE)在Ag/Fe以及Fe0还原体系中的还原脱氯反应.结果表明,Ag的加入会明显提高氯代烃的还原脱氯速率,铁表面积浓度为150 m2·L-1时,如果单独使用Fe0,CF、CT、1,1,1-TCA、1,1,2,2-TeCA、 |
| 英文摘要 |
| Dechlorination of many kinds of chlorinated hydrocarbons including trichloromethane(CF),tetrachloromethane(CT),1,1,1-trichloroethane(1,1,1-TCA),1,1,2,2-tetrachloroethane(1,1,2,2-TeCA),hexachloroethane(HCA),trichloroethylene(TCE),perchloroethylene(PCE) in water by Fe and Ag/Fe were investigated.Results show that the existence of Ag on Fe can enhance the dechlorination rate of chlorinated hydrocarbons.When the surface area concentration of iron is 150 m2·L-1,the dechlorination rate constant of CF,CT,1,1,1-TCA,1,1,2,2-TeCA,HCA are 0.084h-1,2.358 h-1,0.417 h-1,0.215 h-1,1.098 h-1 by single Fe0,in this condition,no dechlorination of TCE and PCE during 10h,while the dechlorination rate constant of CF,CT,1,1,1-TCA,1,1,2,2-TeCA,HCA,TCE,PCE are up to 1.850 h-1、9.504 h-1、1.624 h-1、1.778 h-1、2.842 h-1、0.463 h-1、1.251 h-1 by Ag/Fe. The dechlorination rate constant of CF can increase by the factor of 20.The reaction pathways of chlorinated hydrocarbons with Fe and Ag/Fe were mainly including hydrogenolysis,reductive elimination and dehydrochlorination.The hydrogenolysis is the main reaction pathway for CF,TCE and PCE.The dechlorination pathway of 1,1,1-TCA are both hydrogenolysis and dehydrochlorination.Reductive β elimination to form DCE is the dominant reaction pathway of 1,1,2,2-TeCA,and HCA is via reductive β elimination to form PCE firstly,then via hydrogenolysis to DCE. |
|
|
|
