文献类型：期刊文献

中文题名：Enhanced degradation of trichloroethene by calcium peroxide activated with Fe（III） in the presence of citric acid

英文题名：Enhanced degradation of trichloroethene by calcium peroxide activated with Fe（III） in the presence of citric acid

作者：Xiang ZHANG[1];Xiaogang GU[1];Shuguang LU[1];Zhouwei MIAO[1,2];Minhui XU[1];Xiaori FU[1];Muhammad DANISH[1];Mark L. BRUSSEAU[2];Zhaofu QIU[1];Qian SUI[1]

机构：[1]State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China;[2]Soil, Water and Environmental Science Department, School of Earth and Environmental Sciences, The University of Arizona, 429 Shantz Building, Tucson, AZ 85721, United States

年份：2016

卷号：10

期号：3

起止页码：502

中文期刊名：Frontiers of Environmental Science & Engineering

外文期刊名：环境科学与工程前沿（英文）

收录：CSCD:【CSCD2015_2016】；

基金：This study was financially supported by the National Natural Science Foundation of China （Grant Nos. 41373094 and 51208199）, China Postdoctoral Science Foundation （No. 2015M570341） and the Fundamental Research Funds for the Central Universities （No. 22A2015 14057）. The contributions of Dr. Mark Brusseau were supported by the NIEHS Superfund Research Program （P42 ES04940）.

语种：英文

中文关键词：calcium peroxide;trichloroethene （TCE）;citric acid;ferric ion;free radicals;oxidation

外文关键词：calcium peroxide, trichloroethene （TCE）, citric acid, ferric ion, free radicals, oxidation

摘要：Trichloroethene （TCE） degradation by Fe（III）- activated calcium peroxide （CP） in the presence of citric acid （CA） in aqueous solution was investigated. The results demonstrated that the presence of CA enhanced TCE degradation significantly by increasing the concen- tration of soluble Fe（III） and promoting H202 generation. The generation of HO· and O2^-· in both the CP/Fe（III） and CP/Fe（III）/CA systems was confirmed with chemical probes. The results of radical scavenging tests showed that TCE degradation was due predominantly to direct oxidation by HO·, while O2^-· strengthened the generation of HO· by promoting Fe（III） transformation in the CP/Fe （III）/CA system. Acidic pH conditions were favorable for TCE degradation, and the TCE degradation rate decreased with increasing pH. The presence of Cl·-, HCO3·-, and humic acid （HA） inhibited TCE degradation to different extents for the CP/Fe（III）/CA system. Analysis of Cl·- production suggested that TCE degradation in the CP/Fe （III）/CA system occurred through a dechlorination process. In summary, this study provided detailed information for the application of CA-enhanced Fe（III）-activated calcium peroxide for treating TCE contaminated groundwater.
Trichloroethene （TCE） degradation by Fe（III）- activated calcium peroxide （CP） in the presence of citric acid （CA） in aqueous solution was investigated. The results demonstrated that the presence of CA enhanced TCE degradation significantly by increasing the concen- tration of soluble Fe（III） and promoting H202 generation. The generation of HO· and O2^-· in both the CP/Fe（III） and CP/Fe（III）/CA systems was confirmed with chemical probes. The results of radical scavenging tests showed that TCE degradation was due predominantly to direct oxidation by HO·, while O2^-· strengthened the generation of HO· by promoting Fe（III） transformation in the CP/Fe （III）/CA system. Acidic pH conditions were favorable for TCE degradation, and the TCE degradation rate decreased with increasing pH. The presence of Cl·-, HCO3·-, and humic acid （HA） inhibited TCE degradation to different extents for the CP/Fe（III）/CA system. Analysis of Cl·- production suggested that TCE degradation in the CP/Fe （III）/CA system occurred through a dechlorination process. In summary, this study provided detailed information for the application of CA-enhanced Fe（III）-activated calcium peroxide for treating TCE contaminated groundwater.