Fenton process for degradation of selected chlorinated aliphatic hydrocarbons exemplified by trichloroethylene,1,1-dichloroethylene and chloroform  

作　　者：Zhimin QIANG Weiwei BEN Chin-Pao HUANG 

机构地区：[1]Research Center of Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [2]Department of Civil and Environmental Engineering,University of Delaware,Newark,DE 19716,USA

出　　处：《Frontiers of Environmental Science & Engineering》2008年第4期397-409,共13页环境科学与工程前沿（英文）

基　　金：The authors greatly appreciate the financial support from the Department of Energy,USA(Grant No.DE-FG07-96ER14716);This study was also supported by the National Key Technologies R&D Program funded by the Ministry of Science and Technology of China(Grant No.2006BAJ08B02).

摘　　要：The degradation of selected chlorinated aliphatic hydrocarbons(CAHs)exemplified by trichloroethylene(TCE),1,1-dichloroethylene(DCE),and chloroform(CF)was investigated with Fenton oxidation process.The results indicate that the degradation rate was primarily affected by the chemical structures of organic contaminants.Hydroxyl radicals(·OH)preferred to attack the organic contaminants with an electron-rich structure such as chlorinated alkenes(i.e.,TCE and DCE).The dosing mode of Fenton’s reagent,particularly of Fe^(2+),significantly affected the degradation efficiency of studied organic compound.A new“time-squared”kinetic model,C=C_(oexp)(-k_(obst)^(2)),was developed to express the degradation kinetics of selected CAHs.This model was applicable to TCE and DCE,but inapplicable to CF due to their varied reaction rate constants towards·OH.Chloride release was monitored to examine the degree of dechlorination during the oxidation of selected CAHs.TCE was more easily dechlorinated than DCE and CF.Dichloroacetic acid(DCAA)was identified as the major reaction intermediate in the oxidation of TCE,which could be completely removed as the reaction proceeded.No reaction intermediates or byproducts were identified in the oxidation of DCE and CF.Based on the identified intermediate,the reaction mechanism of TCE with Fenton’s reagent was proposed.

关 键 词：Fenton’s reagent TRICHLOROETHYLENE 1 1-dichloroethylene CHLOROFORM DEGRADATION DECHLORINATION 

分 类 号：O62[理学—有机化学]