Degradation of chlorinated phenols by nanoscale zero-valent iron  

作　　者：Rong CHENG Jianlong WANG Weixian ZHANG 

机构地区：[1]Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China [2]Department of Civil and Environmental Engineering,Lehigh University,Bethlehem,PA 18015-3176,USA

出　　处：《Frontiers of Environmental Science & Engineering》2008年第1期103-108,共6页环境科学与工程前沿（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant Nos.50678089 and 50325824),which is greatly acknowledged.

摘　　要：Chlorophenols(CPs),as important contami-nants in groundwater,are toxic and difficult to biode-grade.Recentlynanoscalezero-valentironreceivedagreat deal of attention because of its excellent performance in treating recalcitrant compounds.In this study,nanoscale zero-valent iron particles were prepared using chemical reduction,and the reductive transformations of three kinds of chlorinated phenols(2-CP,3-CP,and 4-CP)by nanoscale zero-valent iron under different conditions were investigated.The transformation process of the CPs was shown to be dechlorination first,then cleavage of the benzene ring.The removal efficiency of the CPs varied as follows:2-CP.3-CP.4-CP.The reactivity of CPs was associated with their energy of lowest unoccupied molecular orbit(E LUMO).With the increase in initial concentrations of CPs,removal efficiency decreased a little.But the quantities of CPs reduced increased evidently.Temperature had influence on not only the removal efficiency,but also the transformation pathway.At higher temperatures,dechlorination occurred prior to benzene ring cleavage.At lower temperatures,however,the oxidation product was formed more easily.

关 键 词：nanoscale zero-valent iron CHLOROPHENOL DECHLORINATION molecular orbit theory 

分 类 号：O62[理学—有机化学]