文献类型：期刊文献

英文题名：Surfactant enhanced persulfate system for the synergistic oxidation and reduction of mixed chlorinated hydrocarbons

作者：Xu, Zhiqiang[1];Cai, Lankun[1];Zhou, Zhengyuan[1];Yang, Rumin[1];Zeng, Guilu[1];Fu, Rongbing[2];Lyu, Shuguang[1]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asses, Shanghai 200237, Peoples R China;[2]Tongji Univ Shanghai, Ctr Environm Risk Management & Remediat Soil & Gro, State Key Lab Pollut Control & Resource Reuse, Shanghai 200092, Peoples R China

年份：2024

卷号：469

外文期刊名：JOURNAL OF HAZARDOUS MATERIALS

收录：;EI(收录号：20240915658482);WOS:【SCI-EXPANDED(收录号:WOS:001199122700001)】；

基金：This study was financially supported by the grants from the National Key R & D Program of China (No. 2023YFC3707700) .

语种：英文

外文关键词：Chlorinated hydrocarbons; Persulfate; Surfactant radical; Synergistic oxidation and reduction; Groundwater remediation

摘要：Surfactant -enhanced in -situ chemical oxidation (S-ISCO) is widely applied in soil and groundwater remediation. However, the role of surfactants in the reactive species (RSs) transformation remains inadequately explored. This work introduced nonionic surfactant Tween-80 (TW-80) into a nano zero-valent iron (nZVI) activated persulfate (PS) system. The findings indicate that PS/nZVI/TW-80 system can realize the concurrent removal of trichloroethylene (TCE), tetrachloroethene (PCE), and carbon tetrachloride (CT), whereas CT cannot be eliminated without TW-80 presence. Further analysis unveiled that hydroxyl (HO center dot) and sulfate radicals (SO4-center dot) were the primary species for TCE and PCE degradation, while CT was reductively eliminated by surfactant radicals generated from TW-80. Moreover, the surfactant radicals were found to accelerate Fe(III)/Fe(II) cycle, reduce the production of iron sludge, and increase PS decomposition. The possible degradation routes of mixed chlorinated hydrocarbons (CHCs) and the decomposition pathways of TW-80 were proposed through the density function theory (DFT) calculation and intermediates analysis. Additionally, the effects of other nonionic surfactants on the simultaneous removal of TCE, PCE, and CT, and the practical applications using the actual contaminated groundwater were also evaluated. This study provides theoretical support for the simultaneous removal of CHCs, particularly those containing perchlorinated contaminants, using the S-ISCO techniques.