金属离子在铁(氢)氧化物与腐殖质微界面上的吸附机理和模型研究进展

摘要

Iron(hydr) oxides and humic substances(HS) are important natural active substances and ubiquitous in soils. Owing to their much larger specific surface area and a greater variety of active functional groups such as-COOH and-OH, the specific interactions of heavy metal ions adsorbing on the surface of iron(hydr) oxides and HS can easily occur through electrostatic and ligand exchange, which affects transport, transformation and biological effects of heavy metal ions. Understanding the mechanism of micro-interfacial interaction between heavy metal ions and iron(hydr) oxide- HS complex is of great importance to clarify the transport and transformation of heavy metal ions in the environment. In this review, the mechanisms and models about the adsorption of metal ions on natural active substances were summarized. These advances would provide an important theoretical basis for risk assessment and control of heavy metals in contaminated soils.%铁(氢)氧化物和腐殖质是广泛分布在土壤中的重要天然活性物质,因其具有较大的比表面积并且铁(氢)氧化物表面的-OH与腐殖质表面的-COOH、-OH等活性官能团可通过静电作用、配体交换等多种机制对重金属离子产生较强吸附,从而影响重金属离子在环境中的迁移、转化和生物效应.深入了解重金属离子在铁(氢)氧化物-腐殖质复合体微界面相互作用的分子机理,对于阐明重金属离子在环境中的迁移、转化过程具有重要意义.本文综述了金属离子在铁(氢)氧化物与腐殖质上吸附机理和模型的研究进展,为重金属污染土壤的风险评估和控制提供理论依据.