重金属Cu2+、Zn2+、Cd2+在海泡石中的吸附特征

针对重金属复合污染问题,通过等温吸附实验,研究了海泡石对复合重金属Cu2+、Zn2+、Cd2+的平衡吸附量和吸附选择性,并通过XRD、IR等分析探讨了海泡石的吸附机理。结果表明:海泡石对Cu2+、Zn2+、Cd2+的吸附顺序和富集系数顺序均为Cu2+>Cd2+>Zn2+,并且平衡吸附量随初始溶液质量浓度的提高而增大;海泡石对重金属离子的吸附主要是离子交换吸附及表面络合吸附。该研究证明海泡石具有较强的吸附复合重金属离子的能力,可修复重金属复合污染的废水及土壤。

Adsorption characteristic of Cu2+,Zn2+ and Cd2+ by sepiolite

Aimed at addressing the combined contamination of heavy metals, this paper offers the study on the equilibrium adsorption capacity and adsorption selectivity of combined heavy metal Cu^2＋, Zn^2＋ and Cd^2＋ by sepiolite, based on isothermal adsorption test, and the analysis of adsorption mechanism of sepiolite by XRD, IR. The test results show that the adsorption of Cu^2＋, Zn^2＋ and Cd^2＋ by sepiolite and enrichment coefficient are in the order of Cu^2＋, Zn^2＋ and Cd^2＋, and the equilibrium adsorption capacity in- creases with the increase of the initial concentration value. Adsorption of heavy metal ions by sepiolite consists mainly of ion exchange adsorption and surface complexation adsorption. The study proves that sepiolite demonstrates a stronger ability of absorbing combined heavy metal and can find use in remediating the waste water and soil subjected to combined contaminations by heavy metals.