土壤环境中铁锰氧化物对重金属的吸附络合机制及其影响因素研究进展  

Research progress on the mechanism for the adsorption and complexation of heavy metals onto iron and manganese oxides and its inf luencing factors in soil environment

作　　者：黄文妍 杨文俊 汤叶涛 仇荣亮 HUANG Wenyan;YANG Wenjun;TANG Yetao;QIU Rongliang(School of Environmental Science and Engineering,Guangdong Provincial Key Laboratory for Environmental Pollution Control and Remediation Technology,Guangdong Provincial Engineering Research Center for Heavy Metal Contaminated Soil Remediation,Sun Yat-sen University,Guangzhou 510006,China;College of Natural Resources and Environment,Guangdong Provincial Key Laboratory of Agricultural&Rural Pollution Abatement and Environmental Safety,South China Agricultural University,Guangzhou 510642,China;Guangdong Laboratory for Lingnan Modern Agriculture,Guangzhou 510642,China)

机构地区：[1]中山大学环境科学与工程学院,广东省环境污染控制与修复技术重点实验室,广东省土壤重金属污染修复工程技术研究中心,广州510006 [2]华南农业大学资源环境学院,广东省农业农村污染治理与环境安全重点实验室,广州510642 [3]岭南现代农业科学与技术广东省实验室,广州510642

出　　处：《地球环境学报》2025年第1期7-19,共13页Journal of Earth Environment

基　　金：国家重点研发计划(2020YFC1807600);国家自然科学基金项目(42207005)。

摘　　要：我国目前土壤重金属污染形势严峻,土壤污染防治工作进入战略性阶段。铁锰氧化物在土壤中广泛赋存,对环境中重金属具有显著的吸附络合作用,含氧阴离子的存在极大地影响重金属在土壤环境中的迁移转化,因此深入探究重金属和含氧阴离子在铁锰氧化物表面的吸附络合及其相互作用机制,对阐明重金属在土壤环境中的迁移转化过程具有重要意义。通过介绍土壤中常见的铁锰氧化物,总结铁锰氧化物对重金属离子、含氧阴离子的吸附络合、相互作用机制及其影响因素,对近年来的相关模型和常用检测技术方法进行综述,最后针对土壤铁锰氧化物和重金属界面交互过程研究领域存在的局限,提出未来潜在研究方向,对土壤系统和污染修复研究具有重要指导意义。Background,aim,and scope Currently,our country’s soil heavy metal(HM)pollution situation is severe,and the task for soil prevention and pollution control has entered a strategic stage.Iron and manganese oxides are widespread in soil.HMs are readily adsorbed by iron and manganese oxides due to their high surface activity and large specific surface area.Meanwhile,the existence of oxyanions also has a great effect on the adsorption and complexion of HMs.It is therefore important to investigate the molecular mechanism of the adsorption,complexation and the interaction with HMs and oxyanions on iron and manganese oxides.And it is also of great significance for us to elucidate the migration and transformation processes of HMs in the soil.Materials and methods This review introduces the common iron and manganese oxides in soil,summarizes the mechanism and influencing factors of HMs and oxyanions adsorbed on iron and manganese oxides,and reviews the related models and common detection techniques in recent years.Results The ions are adsorbed on the surface of iron and manganese oxides through specific and non-specific adsorption.Electrostatic interaction,the formation of ternary complexes and surface precipitation promote the adsorption of oxyanions and HMs onto iron and manganese oxides.Various environmental factors such as pH,Eh,ionic strength,organic matter,the properties of oxyanions and oxides will affect the adsorption and interaction of ions on iron and manganese oxides.In addition to the classical adsorption isotherms Langmuir and Freundlich,the surface complexation models such as charge distribution-multisite complexation models(CD-MUSIC)are commonly used to describe the adsorption process.The Fourier transform infrared spectroscopy(FTIR),X-ray absorption fine structure(XAFS),mathematical analysis and quantum chemical calculations are often conducted to interpret the surface complexation products,and to represent the mechanisms at the molecular level.Discussion Compared to iron oxides,few studies have been perf

关 键 词：铁锰氧化物 重金属 含氧阴离子 吸附络合 

分 类 号：X53[环境科学与工程—环境工程]