• 关键词：氧化铁  表面络合  重金属  吸附  模式

• 基金项目：

• 栾兆坤
• 中国科学院生态环境研究中心, 北京 100085

• 汤鸿霄
• 中国科学院生态环境研究中心, 北京 100085

• 摘要：根据酸性矿山废水污染河流的特征, 着重研究了硫酸铁溶液中和沉淀生成的无定形氧化铁颗粒的表面特性及其对重金属离子的吸附作用。并以硝酸铁溶液中和沉淀生成的无定形氧化铁颗粒作对比, 同时应用表面络合反应关系式求取了该颗粒的表面络合反应的基本特征参数, 最后采用简化的表面络合模式计算了该氧化铁颗粒表面与重金属离子, 如Cu²⁺、Cd²⁺和Pb²⁺结合的表面络合形成条件稳定常数。

• Abstract：Surface characters of amorphous iron oxyhydroxide（from Fe₂（SO₄）₃）,such as its surface charge density,pH_zpc,pH_iepand intrinsic ionization con-stants, were investigated and calculated by potentiometric titration,electro-phoretic mobility measurement and the stoichiometry of surface reactions.ad-sorption character of heavy metal ions on the amorphous iron oxyhydroxide were also studied as a function of pH and concentrations.A simplified sur-face complexation model was used to calculate the conditional binding cons-tants for surface complexation of metal ions on amorphous iron oxyhydroxide.

• Key words：amorphous iron oxyhydroxide  surface characters  adsorption  metals  surface complexation model

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