印迹材料对水溶液中镍离子的选择吸附研究

Study on Selective Adsorption of Nickel Ions in Aqueous Solutions by Imprinted Materials

使用离子印迹材料对Ni(Ⅱ)-Co(Ⅱ)二元体系溶液中的金属离子选择吸附性能进行了研究。结果表明,在溶液中存在单一Ni(Ⅱ)时,其饱和吸附量Qe为8.602 mg/g。在Ni(Ⅱ)-Co(Ⅱ)的二元体系水溶液中,当Ni(Ⅱ)-Co(Ⅱ)离子浓度比为1∶1以及1∶4时,镍离子已经被吸附完全而钴离子的吸附量很少。镍离子分配系数Kd为237.5,而钴离子的分配系数只有0.1044,选择系数为22 274.90,表现出来了良好的选择吸附能力。镍离子印迹材料的吸附符合动力学二级模型。

The selective adsorption properties of ion-imprinted materials for metal ions in Ni(Ⅱ)-Co(Ⅱ)binary system solution were studied.The results showed that when there was a single Ni(Ⅱ)in the solution,its saturated adsorption quantity Qe was 8.602 mg/g.In the aqueous solution of Ni(Ⅱ)-Co(Ⅱ)binary system,when the concentration ratio of Ni(Ⅱ)-Co(Ⅱ)ions was 1∶1 and 1∶4,the nickel ions had been completely absorbed and the adsorption capacity of cobalt ions was very small.The distribution coefficient Kd of nickel ion was 237.5,while the distribution coefficient of cobalt ion was only 0.1044,and the selection coefficient was 22274.90,which showed a good selective adsorption capacity.The adsorption of nickel ion-imprinted material conformed to the kinetic secondary model.