环境工程学报2026，Vol.20Issue(4)：1167-1181,15.DOI:10.12030/j.cjee.202508025
超声耦合铁/氮共掺杂生物炭活化过硫酸盐降解土壤中高分子质量多环芳烃
Ultrasound-coupled Fe-N codoped biochar activating peroxydisulfate for high molecular weight polycyclic aromatic hydrocarbon degradation in soil
摘要
Abstract
Remediation of high molecular weight polycyclic aromatic hydrocarbons(HMW-PAHs,≥4 rings)in contaminated soils remians challenging due to the limited efficiency of conventional techniques.This study proposes a novel approach by coupling ultrasound with iron-nitrogen co-doped biochar(BC-Fe-N)to activate persulfate(PS)system for targeted degradation of HMW-PAHs.Characterization results confirmed that Fe-Nx sites promoted electron transfer.Optimal conditions for PS dosage,BC-Fe-N amount,ultrasound power,and the soil-water ratio were determined.The degradation mechanism was elucidated through electron paramagnetic resonance quenching experiments,density functional theory calculations,and toxicity prediction analysis.The system was validated using actual contaminated soil samples.The results show that the HMW-PAH removal increased with higher PS and BC-Fe-N dosage,elevated ultrasound power,and greater soil-to-water ratio.Degradation efficiency followed the order:benzo[a]anthracene(BaA)>indeno[1,2,3-cd]pyrene(IcdP)>benzo[a]pyrene(BaP)>dibenz[a,h]anthracene(DBahA)>benzo[b]fluoranthene(BbF).The dominant reactive radicals involved were·OH and SO4-·,with 1O2 serving as a secondary pathway.Toxicity of the degradation products was significantly reduced.After treatment,concentrations of BaA,BaP,BbF,and DBahA in contaminated soil from the Tangshan coking plant fell below China's Class Ⅰ land-use standards,with a total remediation cost of 405.15 CNY per ton of soil..The ultrasonic-BC-Fe-N/PS ternary system presents an efficient,low-toxicity strategy for in-situ remediation of HMW-PAH contaminated soils.关键词
铁/氮共掺杂生物炭/超声强化/过硫酸盐活化/HMW-PAHs/协同修复机制/土壤修复/深度减毒Key words
Fe-N co-doped biochar/ultrasound enhancement/persulfate activation/HMW-PAHs/synergistic remediation mechanism/soil remediation/detoxification分类
资源环境引用本文复制引用
李超,吴建勋,卓冬茹,马杜娟,殷思达,杨婧羚,陆钢,朱明山..超声耦合铁/氮共掺杂生物炭活化过硫酸盐降解土壤中高分子质量多环芳烃[J].环境工程学报,2026,20(4):1167-1181,15.基金项目
国家重点研发计划资助项目(2024YFC3713800) （2024YFC3713800）
