锰改性稻壳对铅的吸附

Adsorption of Lead on Rice Husk Modified by Manganese

采用高锰酸钾氧化改性稻壳,制备新型的改性吸附剂,研究其对Pb^(2+)的吸附性能。结果表明:吸附Pb^(2+)的最适p H值为4~6;初始Pb^(2+)浓度在50 mg/L以下时,饱和吸附量随Pb^(2+)浓度提高而提高,最高达到28.85 mg/g。吸附等温线和动力学方程拟合分析表明锰改性稻壳对Pb^(2+)的吸附属于单层吸附,吸附过程主要受限于孔隙扩散。

New modified adsorbent is prepared with rice husk modified by potassium permanganate oxidation,and its adsorption performance for Pb^（2＋） is studied. The results show that the optimum p H value for Pb^（2＋） adsorption is 4 - 6. When the initial Pb^（2＋）concentration is lower than 50 mg/L,the saturated adsorption capacity increases with the increasing of Pb^（2＋）concentration,reaching a maximum of 28. 85 mg/g.The fitting analysis of adsorption isotherm and kinetic equations show that adsorption of Pb^（2＋） by Mn-modified rice husk belongs to monolayer adsorption,and the adsorption process is mainly restricted by pore diffusion.