文献类型：期刊文献

英文题名：Photodegradation performance of 1,1,1-trichloroethane in aqueous solution: In the presence and absence of persulfate

作者：Gu, Xiaogang[1];Lu, Shuguang[1];Qiu, Zhaofu[1];Su, Qian[1];Banks, Charles J.[2];Imai, Tsuyoshi[3];Lin, Kuangfei[1];Luo, Qishi[4]

机构：[1]E China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Univ Southampton, Sch Civil Engn & Environm, Southampton SO17, Hants, England;[3]Yamaguchi Univ, Dept Civil Engn, Yamaguchi 7558611, Japan;[4]Shanghai Acad Environm Sci, Shanghai 200233, Peoples R China

年份：2013

卷号：215

起止页码：29

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20130515980026);WOS:【SCI-EXPANDED(收录号:WOS:000316032100005)】；

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. 51208199), Shanghai Natural Science Funds (No. 12ZR1408000), and China Postdoctoral Science Foundation (No. 2011M500071), the Fundamental Research Funds for the Central Universities (No.WB1214034).

语种：英文

外文关键词：1,1,1-Trichloroethane; Groundwater remediation; Photochemistry; VUV; Persulfate

摘要：Photodegradation of 1,1,1-trichloroethane (TCA), a chlorinated solvent, with VUV and VUV/S2O82- processes was investigated. The effects of various parameters including solution pH, Cl- and HCO3- anions, and humic acid (HA) were evaluated. The results indicated that TCA can be effectively removed under VUV irradiation, and the addition of S2O82-, significantly enhanced TCA removal. TCA decomposition in both processes follows the pseudo-first-order kinetic model. In the pH adjusted solutions (from pH 3 to 11), maximum TCA degradation rate occurred at pH 3 and remarkable inhibition at pH 11 in the two processes. Both Cl- and HCO3- anions, as well as HA, adversely affected TCA degradation performance. Moreover, TCA degradation in the VUV/S2O82- process was more sensitive to all the influence factors than in the VUV process. The organic chlorine in TCA was released completely to chloride ion as a final product in both processes. Several reaction intermediates, including 1,1-dichloroethylene, 1,1,1,2-tetrachloroethane, perchloroethylene, carbon tetrachloride, chloroform, and dichloromethane were identified during TCA degradation in the presence of S2O82- . In summary, it can be concluded that the presence of persulfate was much more effective than the VUV alone, but the latter was more environmentally friendly due to the formation of nontoxic intermediates. (C) 2012 Elsevier B.V. All rights reserved.