文献类型：期刊文献

英文题名：Removal of individual polychlorinated biphenyl congeners in soil-water systems using reactive activated carbon: Influence of chlorine substituent number and position

作者：Wang, Xiaochong[1,2];Yu, Tian[1,2];Zhang, Wei[1,2,3];Chen, Xiaofei[1,2];Xiu, Guangli[1,2,3]

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;[3]Tongji Univ, Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

年份：2026

卷号：288

外文期刊名：ENVIRONMENTAL RESEARCH

收录：;EI(收录号：20254619491948);WOS:【SCI-EXPANDED(收录号:WOS:001619773500002)】；

基金：This work was supported by the National Natural Science Foundation of China [No. 41201302] and the Natural Science Foundation of Shanghai [No. 25ZR1401092] .

语种：英文

外文关键词：RAC; PCBs; Soil; Removal kinetics; Dechlorination

摘要：A systematic understanding of individual polychlorinated biphenyls (PCBs) congeners removal kinetics in soil phase during reactive activated carbon (RAC) treatment is currently lacking. Therefore, a comprehensive investigation was conducted into the rates of removal and dechlorination for more than 10 individual PCB congeners when utilizing RAC within water and soil matrices. The result showed that RAC exhibited superior performance for removing PCB congeners in water, achieving 84.23 %-99.81 % removal rates within 16 h. Furthermore, the RAC also achieved the total removal and dechlorination efficiencies of 66.82 %-82.11 % and 33.64 %-63.87 % for PCBs in soil within 7 days, respectively. Notably, 3,3',5-ClBP exhibited the fastest removal rate in soil phase, while some low-chlorinated PCBs with ortho-substituents (non-planar) displayed more rapid removal rates in water phase, indicating adsorption and dechlorination rates dominated over mass transfer in soil treatment. Interestingly, PCBs with higher degree of chlorination in soil exhibited faster dechlorination rates on Day 1, but this advantage in dechlorination rates gradually disappeared as the reaction time progressed. The dechlorination difficulty of chlorine atoms at different positions on PCBs followed the order of ortho-, meta-, and para-positions. Non-planar ortho-substituted PCBs and highly chlorinated congeners (>= 4 Cl) showed slower total removal rates due to the greater difficulty in dechlorination and desorption from soil organic matter respectively. Mass balance analysis for 2,4,5-ClBP and 2,2',4,4',5,5'-ClBP removal confirmed these trends in removal and dechlorination rates and the QSAR-based toxicity assessment confirmed the reduced toxicity during RAC treatment. This study provides valuable data on the removal and dechlorination kinetics of individual PCB congeners by RAC, supporting its potential as an effective technology for PCBs-contaminated soil remediation.