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研究均苯四甲酸酐修饰β——环糊精微球去除水中重金属离子Zn(Ⅱ)及Cr(Ⅲ)的吸附性能。讨论吸附时间,金属离子浓度对吸附的影响。实验结果表明,当环糊精微球表面被酸酐修饰从而引入大量的羧酸根后,吸附剂对金属离子的吸附性能大大的提高。金属离子吸附动力学拟合结果显示,两种金属在修饰微球上的吸附皆符合准二级动力学方程。用Langmuir及Freundlich方程对吸附等温线进行拟合,前者拟合效果较好(R2>0.99),表明金属离子是以单分子形式吸附。
The adsorption properties of pyromellitic anhydride modified β - cyclodextrin microspheres to remove heavy metal ions Zn (Ⅱ) and Cr (Ⅲ) in water were studied. Discussion of adsorption time, metal ion concentration on the adsorption. The experimental results show that when the surface of cyclodextrin microspheres is modified by anhydride to introduce a large amount of carboxylate, the adsorption properties of the adsorbent on the metal ions are greatly improved. The fitting results of metal ion adsorption kinetics show that the adsorption of the two metals on the modified microspheres is in accordance with the quasi-second-order kinetic equation. The adsorption isotherms were fitted by Langmuir and Freundlich equations. The former fitted better (R2> 0.99), indicating that the metal ions are adsorbed as single molecules.