文献类型：期刊文献

英文题名：Cathodic enhanced electrokinetic remediation of PFOA contaminated soil: Auxiliary agents-enhanced desorption and migration

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, State Environm Protect Key Lab Environm Risk Asses, 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：2025

卷号：528

外文期刊名：JOURNAL OF CLEANER PRODUCTION

收录：;EI(收录号：20254119283576);WOS:【SCI-EXPANDED(收录号:WOS:001592993900001)】；

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; Perfluorooctanoic acid; Auxiliary agents; Cathodic enhancement; Soil physicochemical properties

摘要：Electrokinetic (EK) remediation is a promising in-situ technique for remediating soils contaminated with persistent pollutants, but its efficiency is often limited by poor pollutant desorption and migration. This study explores the use of cathodic auxiliary agents to enhance the EK remediation of PFOA-contaminated soil. Among the desorption tests, SDS (50.93 %) and NaC (43.62 %) were most effective in desorbing PFOA through electrostatic, hydrophobic interactions, and micelle formation, outperforming DTAB (15.29 %) and CA (37.76 %). Continuous desorption tests validated the effectiveness of employing auxiliary agents as electrolytes. EK remediation experiments revealed that these agents facilitated PFOA desorption and migration, achieving higher removal efficiencies. After 7 d, NaC achieved a greater enhancement effect than SDS, with PFOA removal rates of 58.04 % (2 V/cm) and 63.70 % (2 V/cm), respectively. PFOA accumulation in the middle soil area was observed, due to opposing electroosmotic and electrokinetic forces, with electromigration being the dominant factor. Extending remediation time alleviated this accumulation. Kinetic analysis revealed that PFOA migration in most areas followed pseudo-second-order kinetics, while the middle area exhibited first-order kinetics due to PFOA accumulation. The auxiliary agents primarily enhanced PFOA removal efficiency indirectly by influencing electromigration, electroosmosis, and desorption processes, while changes in soil physicochemical properties served as limiting factors. This study provides valuable insights into the combined effects of cathodic-enhanced EK and auxiliary agents on PFOA remediation, offering theoretical and practical guidance for the development of efficient and sustainable remediation technologies.