【作者】 吴德礼； 王红武； 马鲁铭；

【Author】 De-Li Wu, Hong-Wu Wang, Lu-Ming Ma (College of Environmental Science and Engineering, State Engineering Research Center for Urban Pollution Control, Tongji University, China, 200092)

【机构】 同济大学环境科学与工程学院城市污染控制国家工程研究中心；

【摘要】 POPs污染物大多是含氯有机物,其生物毒性主要取决于氯取代基官能团。通过构建 Fe0、Cu／Fe、Ag／Fe、Pd／Fe等多种催化还原体系研究了含氯有机物发生还原脱氯而去除生物毒性的可行性。结果表明氯代有机物可以在催化铁还原体系中发生还原脱氯反应,大大降低其生物毒性。六氯乙烷在Fe0、Cu／Fe、Ag／Fe、Pd/Fe还原体系中的反应速率常数分别为1．038h-1、2．050 h-1、2．784 b-1、1．262 h-1。含氯有机物在不同的还原体系中会生成不同的还原产物,六氯乙烷在Ag／Fe体系中主要还原产物为PCE、TCE、trans-DCE和cis-DCE,而在Pd／Fe还原体系中则主要为乙烷。氯代有机物在铁还原体系中的脱氯途径主要为逐级氢解还原和β还原消除,还原机理以在单质铁表面直接得电子还原为主,同时也存在亚铁还原和新生态氢还原的可能性。更多还原

【Abstract】 POPs almost are chlorinated hydrocarbons which are toxic because the chlorine function group. The feasibility of reductive detoxication by Fe0, Cu/Fe, Ag/Fe, Pd/Fe was investigated. Results show that the reductive dechlorination of chlorinated hydrocarbons by reduction systems can be completed and the toxicity of chlorinated hydrocarbons are reduced highly. However, the dechlorination rate can be effluenced by reduction systems, for example, the rate constant of HCA are 1.038h-1、2.050 h-1、2.784 h-1、1.262 h-1 respectively with Fe0, Cu/Fe, Ag/Fe, Pd/Fe system. Reduction products of chlorinated hydrocarbons are different if they with different reductive system, for example, the main products of HCA are PCE, TCE, trans-DCE and cis-DCE with Ag/Fe system, but that is ethane with Pd/Fe system. The dechlorination pathways of many chlorinated hydrocarbons are successive hydrogenesis and β reductive elimination, and direct electron transformation from iron surface to chlorinated hydrocarbons is the dominant mechanism, addition to reduction by ferrous iron or newformative hydrogen.更多还原