pH值对重金属Pb^(2+)吸附特性的影响

Effect of pH Level on Adsorption Characteristics of Pb^(2+)

以砂壤土为研究对象,采用1次平衡法,研究了pH值对重金属Pb2+吸附特性的影响,在此基础上对等温吸附进行模拟分析。结果表明,土壤对Pb2+吸附的pH值影响敏感阈值范围为pH<7。所引入的平衡质量体积比与吸附量之间的模型ln(S)=K1×CK2能较好地模拟不同pH值条件下的等温吸附规律。其次为Freundilich模型,Henry模型较适用于低pH值条件下的模拟分析。

The balance method was used to study the effect of pH level on adsorption characteristics of Pb^2＋.On the basis,isothemal adsorption was simulated.The results showed that the absorption of Pb^2＋ is sensitive less pH 7.The model of ln（S）=K1×C^K2 between balance concentration and absorption capacity that is introduced can simulated isothemal adsorption well under different pH level.Freundilich model is better,and Henry model is fit to less pH level.