腐植酸对铜、锌、钼和锰的吸附研究

Study on Adsorption of Cu,Zn,Mo and Mn by Humic Acid

研究了腐植酸对水溶液中重金属铜、锌、钼和锰等离子的吸附行为,并对分析的最佳条件进行了探讨。泥炭经磺化处理,制备不溶性腐植酸,其温度和吸附时间等对吸附的影响结果表明,随着pH的增大,腐植酸对铜、锌、钼和锰的吸附率增加。当pH=5时,铜、锌、钼和锰在腐植酸中的吸附率达到最大值。吸附进行20min后,腐植酸对4种离子的吸附率达到最大值。吸附等温线分别以Freundlich方程和Langmuir方程进行拟合,结果显示:锰、钼和铜吸附的最佳模型为Langmuir方程,锌的最佳吸附模型是Freundlich方程。同时发展了ICP测定重金属铜、锌、钼和锰的分析方法。

The adsorption behaviors of Cu,Zn,Mo and Mn by humic acid were studied,and the optimal analysis conditions were aslo discussed. Insoluble humic acid was prepared by sulphonated peat. The results showed that the adsorption capacity of humic acid was increased with pH increasing,and the maximum adsorption was obtained after 20 minutes at pH 5. The experimental data was analyzed by two different models of Freundlich and Langmuir isotherm. As a result,the adsorption of Mo,Mn and Cu were best fi tted by Langmuir isotherm model,while that of Zn was fitted by model of Freundlich isotherm.