太原理工大学学报2026，Vol.57Issue(4)：708-719,12.DOI:10.16355/j.tyut.1007-9432.20260038
赤泥改性生物炭修复铅污染土的电化学阻抗响应及其曲线重构
Electrochemical Impedance Response and Curve Reconstruction of Red Mud-Modified Biochar for Remediation of Lead-Contaminated Soil
摘要
Abstract
[Purposes]Biochar and its modified materials have shown certain application potential in the remediation of heavy metal-contaminated soils.However,the electrochemical response charac-teristics during the remediation of lead-contaminated soil by using red mud-modified biochar(RMBC)require further clarification.[Methods]Electrochemical impedance spectroscopy(EIS)was used to measure the impedance of soil specimens with different RMBC dosages and curing ages.The evolu-tion of impedance spectra was analyzed by using equivalent circuit model,low-field nuclear magnetic resonance,and machine learning.[Results]The results show that RMBC increases the radius of the capacitive arc in the Nyquist plots,which first increases and then tends to stabilize with increasing RM-BC dosage.With prolonged curing age,the diffusion feature in the low-frequency region gradually weakens,and the charge-transfer process becomes dominant.The equivalent circuit parameters indi-cate that RMBC affects the conductivity of the pore solution,interfacial charge transfer,and diffusion impedance.Low-field nuclear magnetic resonance results show that RMBC reduces the proportion of micropores and increases the proportions of small and mesopores.A data-driven model is developed by dividing the training and testing sets at the level of complete Nyquist curves.The model captures the overall trend of impedance spectra,although deviations remain in the high-impedance and low-fre-quency region.[Conclusions]These results indicate that EIS can characterize the impedance response of RMBC-remediated lead-contaminated soil,and machine learning can serve as an auxiliary tool for rapid estimation of Nyquist curves.关键词
生物炭/重金属污染/电化学阻抗谱/机器学习Key words
biochar/heavy metal contamination/electrochemical impedance spectroscopy/machine learning分类
建筑与水利引用本文复制引用
李加时,肖泽岸,董晓强,刘晓凤,郝浩杰,幸得豪,冯昱翰,张硕,李磊..赤泥改性生物炭修复铅污染土的电化学阻抗响应及其曲线重构[J].太原理工大学学报,2026,57(4):708-719,12.基金项目
国家自然科学基金资助项目(52408380,42271137,52378360,51978438) （52408380,42271137,52378360,51978438）
冰冻圈科学与冻土工程全国重点实验室开放基金(CSFSE-KF-2512) （CSFSE-KF-2512）
山西省科技创新人才团队专项资助 （）
岩土力学与工程国家重点实验室开放基金(SKLGME022012) （SKLGME022012）
山西省留学回国人员科研资助项目(2023-060) （2023-060）
