文献类型：期刊文献

英文题名：Mechanistic insights into surfactant in enhanced reductive degradation of perchlorinated organic contaminants in Fenton system

作者：Xu, Zhiqiang[1];Cai, Lankun[1];Yang, Rumin[1];Zhou, Zhengyuan[1];Zeng, Guilu[1];Lyu, Shuguang[1]

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

年份：2023

卷号：322

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20230017656);WOS:【SCI-EXPANDED(收录号:WOS:001027995800001)】；

基金：This study was financially supported by the grants from the National Key R & D Program of China (No. 2018YFC1802500) and "One Belt and One Road" International Academic Cooperation and Exchange Program of Shanghai Science and Technology Committee (No. 19230742200) .

语种：英文

外文关键词：Surfactant solubilization; Surfactant radical; Reductive degradation; Carbon tetrachloride; Groundwater remediation

摘要：This study investigates the mechanisms of surfactants in surfactant-in situ chemical oxidation (S-ISCO) for enhanced degradation of perchlorinated organic contaminants. The addition of Tween-80 (TW-80) or sodium dodecyl sulfate (SDS) in Fenton system resulted in a significant improvement in carbon tetrachloride (CT) removal from 6.2 % to 97.2 % and from 8.2 % to 91.8 %, respectively. Upon further analysis of free radical quenching studies and electron paramagnetic resonance (EPR) tests, it was observed that surfactant radicals were responsible for CT removal with TW-80 presence, while superoxide radicals (O2  & BULL;) and carbon dioxide radicals (CO2  & BULL;) were the primary radicals with SDS presence. The dechlorination of CT reached 82.1 % and 75.3 % with TW-80 or SDS presence, respectively, indicating that most of the degraded CT could be completely mineralized. The possible degradation pathways of CT were proposed based on the detected intermediates. Additionally, degradation of various single or mixed chlorinated hydrocarbon contaminants with TW-80 or SDS presence in Fenton system was performed. The study also assessed the influence of different solution matrixes on CT degradation and the impact of the recovered surfactant solution after reaction on CT solubilization and removal. In summary, this study provides theoretical support for groundwater remediation with perchlorinated contaminants when containing surfactants.