文献类型：期刊文献

英文题名：Degradation of trichloroethylene in aqueous solution by persulfate activated with citric acid chelated ferrous ion

作者：Wu, Xiaoliang[1];Gu, Xiaogang[1];Lu, Shuguang[1];Xu, Minhui[1];Zang, Xueke[1];Miao, Zhouwei[1];Qiu, Zhaofu[1];Sui, Qian[1]

机构：[1]E China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China

年份：2014

卷号：255

起止页码：585

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20143017974942);WOS:【SCI-EXPANDED(收录号:WOS:000341470800067)】；

基金：This study was financially supported by the Grant from the National Environmental Protection Public Welfare Science and Technology Research Program of China (No. 201109013), the National Natural Science Foundation of China (No. 41373094 and No. 51208199), the Shanghai Natural Science Funds (No. 12ZR1408000), China Postdoctoral Science Foundation (No. 2013T60429), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Persulfate; Ferrous ion; Citric acid; Reactive oxygen species; Groundwater remediation

摘要：In this study, persulfate (PS) activated by the citric acid (CA)-chelated-ferrous ion (Fe(II)) to stimulate the oxidation of trichloroethylene (TCE) in groundwater remediation was investigated. The experimental results showed that TCE can be completely degraded over 60 min with a PS/Fe(II)/CA/TCE molar ratio of 15:2:1:1, demonstrating the effectiveness of Fe(II)-CA activated PS oxidation on TCE degradation. The probe compound tests clearly identified the generation and intensity of the reactive oxygen species in PS/Fe(II)/CA system, namely sulfate radicals (center dot SO4-), hydroxyl radicals (center dot OH) and superoxide radical anions (O-2(-center dot)). Moreover, the free radical quenching studies further indicated the generation of these reactive oxygen species and OH is the predominant one in Fe(II)-CA-activated PS system. The TCE degradation rate decreased as the Cl-, HCO3- anions and HA increased over the tested range of ion strengths, owing to their significant scavenging function to center dot OH and center dot SO4- radicals. Briefly, Fe(II)-CA activated PS oxidation is a highly promising technique for remediation of the contaminated sites containing TCE, but more complex constituents existed in in-situ groundwater should be carefully considered for its practical application. (C) 2014 Elsevier B.V. All rights reserved.