生态环境学报2025，Vol.34Issue(4)：621-630,10.DOI:10.16258/j.cnki.1674-5906.2025.04.011
毫米级磁性复合黏土矿物修复材料的结构、性质及其对镉的吸附特征
Structural,Physicochemical and Cadmium Adsorption Properties of Millimeter-Scale Magnetic Composite Clay-Based Remediation Materials
摘要
Abstract
In response to the pressing challenge of environmental cadmium(Cd)pollution,magnetic adsorbent materials have attracted significant attention as highly efficient and environmentally sustainable solutions for Cd remediation.These materials offer enhanced performance and eco-friendliness,making them promising tools to mitigate Cd contamination.Their ability to effectively absorb Cd,combined with their facile recovery through magnetic separation,underscores their potential for practical applications and environmental protection.Our research group previously developed millimeter-scale magnetic composite clay-based remediation materials by utilizing iron(Ⅱ,Ⅲ)oxide(Fe3O4)as the magnetic matrix and combining it with thiol-modified palygorskite-clay minerals.These materials have demonstrated significant advancements in Cd adsorption and removal from contaminated soils,resulting in notable improvements in the soil quality and environmental restoration.Despite these successes,the comprehensive characterization of the structural properties of such materials remains limited,and the mechanisms governing their Cd adsorption behavior are not fully understood.To address these gaps,this study systematically characterized the microstructure and structural properties of millimeter-scale magnetic composite clay-based remediation materials using advanced analytical techniques.These include scanning electron microscopy(SEM),Brunauer-Emmett-Teller(BET)surface area analysis,Fourier-transform infrared spectroscopy(FTIR),X-ray diffraction(XRD),zeta potential measurements,thermogravimetric/differential thermal analysis(TG/DSC),and magnetic property testing.By integrating the adsorption kinetics and isotherm models,this study thoroughly investigated the Cd adsorption characteristics of the materials and explored the relationship between their structure and functionality to elucidate the mechanisms underlying Cd adsorption.The results reveal that millimeter-scale magnetic composite clay-based remediation materials possess a spherical morphology with an average diameter of 1.27 mm and exhibit a highly wrinkled,porous surface.These materials offer several unique advantages,including an optimal particle size,abundance of functional groups,robust structural stability,and facile magnetic recoverability.The adsorption kinetics followed the pseudo-second-order kinetic model,whereas the adsorption isotherms were aligned with the Langmuir model,indicating monolayer adsorption on the homogeneous sites.The theoretical maximum adsorption capacity for Cd was determined to be 46.14 mg·g-1.Cd adsorption by millimeter-scale magnetic composite clay-based remediation materials likely involves multiple mechanisms including intraporous diffusion,coordination complexation,ion exchange,and electrostatic adsorption.This study provides a scientific basis for understanding the properties and contaminant removal efficacy of millimeter-scale magnetic composite clay-based remediation materials,thereby advancing their potential applications in environmental remediation.关键词
毫米级磁性吸附材料/黏土矿物/结构性质/吸附特征/镉Key words
millimeter-scale magnetic adsorbent materials/clay minerals/structural properties/adsorption characteristics/cadmium分类
资源环境引用本文复制引用
吴昕优,涂晨,刘国明,杨帅,王译,王旭洋,骆润来,李忠元,骆永明..毫米级磁性复合黏土矿物修复材料的结构、性质及其对镉的吸附特征[J].生态环境学报,2025,34(4):621-630,10.基金项目
国家重点研发计划项目(2022YFD1700104) （2022YFD1700104）
国家自然科学基金项目(42207044) （42207044）
中国科学院南京土壤研究所自主部署项目(ISSAS2417 （）
ISSASIP2204) （）
中国建筑生态环保工程研究中心(土壤修复技术与装备)、中国建筑第八工程局有限公司项目(CSCEC-PT-009) （土壤修复技术与装备）
