%0 Journal Article
%T Reductive Dechlorination of Chlorinated Hydrocarbons in Water by Ag/Fe Catalytic Reduction System<br>Ag/Fe催化还原体系处理水体中氯代烃的研究
%A WU De-li
%A WANG Hong-wu
%A MA Lu-ming
%A <br>吴德礼
%A 王红武
%A 马鲁铭
%J 环境科学
%D 2006
%I 
%X 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 x L(-1), the dechlorination rate constant of CF, CT, 1, 1, 1-TCA, 1, 1, 2, 2-TeCA, HCA are 0.084 h(-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 beta elimination to form DCE is the dominant reaction pathway of 1, 1, 2, 2-TeCA, and HCA is via reductive beta elimination to form PCE firstly, then via hydrogenolysis to DCE.
%K chlorinated hydrocarbons
%K reductive dechlorination
%K catalytic reduction
%K Ag/Fe catalytic reduction system<br>氯代烃
%K 还原脱氯
%K 催化还原
%K Ag/Fe催化还原体系
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=07CAD53E7C754F6A&yid=37904DC365DD7266&vid=DB817633AA4F79B9&iid=9CF7A0430CBB2DFD&sid=0344F3FCD862F7B0&eid=68171D3FB779E811&journal_id=0250-3301&journal_name=环境科学&referenced_num=7&reference_num=18