文献类型：期刊文献

英文题名：Enhanced electrokinetic removal of PFOA from soil: Key mechanisms and the role of fulvic acid complexation

作者：Li, Mengwei[1,2];Xiu, Guangli[1,2];Zhang, Wei[1,2]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, Key Lab Environm Risk Assessment & Control Chem Pr, Minist Ecol & Environm, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Environm Protect Key Lab Environm Stand &, Shanghai 200237, Peoples R China

年份：2026

卷号：528

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20260219900491);WOS:【SCI-EXPANDED(收录号:WOS:001659398600001)】；

基金：This work was financially supported by Key Projects of the Joint Fund of Guidelines for Collaborative Implementation and Management of Ecological and Environmental Standards in the Yangtze River Delta (Hu Huan Ke [2024] No. 28) .

语种：英文

外文关键词：Electrokinetic remediation; Humic substances; Perfluorooctanoic acid -contaminated soil; Soil pore structure; Mechanism analysis

摘要：The effectiveness of different types of humic substances (HS) in electrokinetic remediation combined permeable reactive barrier (EK-PRB) technique for remediating PFOA-contaminated soil and their impact on soil pore structure remain unclear. This study explored the distinct mechanisms by which various HS regulate PFOA removal during EK-PRB remediation. Fulvic acid (FA), due to its higher solubility and stronger electron acceptor capacity, moderately enhanced the electric field conditions and soil properties, achieving a removal efficiency of 96.18 % after 21 d. Additionally, FA-treated soil exhibited higher porosity (52.05 %) and a stable micropore structure, which facilitated more efficient PFOA transport and removal. In contrast, humic acid (HA) induced significant changes in soil pore structure, particularly under acidic conditions, forming aggregates that hindered PFOA migration and retention. The removal efficiency for HA was 93.35 %, which was lower than the control group (94.87 %). Density functional theory analysis further confirmed FA's stronger electric field responsiveness and enhanced PFOA migration under an applied electric field. Furthermore, multidimensional analysis revealed that "electrochemical driving + pore structure regulation" was the core synergistic mechanism for PFOA removal in EK-PRB remediation. These findings provide theoretical support and practical guidance for the application of EK-PRB remediation in the remediation of PFOA-contaminated soils.