文献类型：期刊文献

英文题名：Removal of 1,1,1-trichloroethane from aqueous solution by a sono-activated persulfate process

作者：Li, Bingzhi[1,2];Li, Lin[2];Lin, Kuangfei[2];Zhang, Wei[2];Lu, Shuguang[2];Luo, Qishi[1]

机构：[1]Shanghai Acad Environm Sci, Shanghai 200233, Peoples R China;[2]E China Univ Sci & Technol, Shanghai Key Lab Funct Chem, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China

年份：2013

卷号：20

期号：3

起止页码：855

外文期刊名：ULTRASONICS SONOCHEMISTRY

收录：;EI(收录号：20130415940196);WOS:【SCI-EXPANDED(收录号:WOS:000315322200011)】；

基金：Funding for this work was provided by the National Natural Science Foundation of China (Grant No. 40901148, 20807028), the National Environmental Protection Public Welfare Science and Technology Research Program of China (Grant No. 201109013), Shanghai Municipal Natural Science Foundation (Grant No. 12ZR1426500), the Shanghai Postdoctoral Sustentation Fund, China (Grant No. 11R21412500), and the National Science Foundation for Post-doctoral Scientists of China (Grant No. 20110490683).

语种：英文

外文关键词：1,1,1-Trichloroethane; Persulfate; Sonolysis; Degradation pathway; Pseudo-first-order kinetics

摘要：1,1,1-Trichloroethane (TCA), labeled as a priority pollutant by the Environmental Protection Agency (EPA) of China, can be removed from groundwater by sonochemical oxidation. The sonochemical oxidation of TCA in the presence of persulfate (PS) showed a significant synergistic effect. The operational parameters, ultrasonic frequency, PS/TCA molar ratio, radical scavenger, inorganic anions (Cl-, CO32-, HCO3- and NO3-) and humic acid (HA), were evaluated during the investigation of the sonochemical reaction. The results showed that the degradation of TCA followed pseudo-first-order kinetics, and the rate constant was found to increase with increasing ultrasonic frequency but to decrease with both an increasing PS/TCA molar ratio and an increasing concentration of inorganic anions. With a concentration of 4.46 mg/L of HA in solution, an enhanced effect was observed. Further addition of HA retarded the degradation rate of TCA. TCA could be eliminated almost completely by sono-activated persulfate oxidation, with sulfate and hydroxyl radicals serving as the principal oxidants as confirmed by the addition of radical scavengers. Eleven chlorinated degradation intermediates were detected and quantified by purge and trap gas chromatography coupled with mass spectrometry (P&T-GC-MS) in the absence of pH buffer. Three TCA degradation pathways were therefore proposed. In conclusion, the sono-activated persulfate oxidation process appears to be a highly promising technique for the remediation of TCA-contaminated groundwater. (C) 2012 Elsevier B.V. All rights reserved.