一种超分子金属有机凝胶对甲基橙染料分子的吸附性能研究

A supramolecular metal-organic gel Synthesized for adsorption of methyl orange

以双羧酸功能化的苯并咪唑内鎓盐(L17)和硝酸银为原料制备了超分子金属有机凝胶,研究了该凝胶对罗丹明B、孔雀石绿及甲基橙的吸附性能,实验结果表明在水相中该凝胶可以选择性地吸附甲基橙分子。同时,考察了干凝胶用量、吸附时间、凝胶因子与金属离子配比及pH值等因素对吸附性能的影响,发现干凝胶用量为5mg、吸附时间在40～60min、最佳配比为1∶1、体系pH值为5～11时体现出最佳的吸附能力。该干凝胶对甲基橙的吸附行为符合Lang-muir及Freundlich等温吸附式,从动力学角度分析该吸附行为受液膜扩散控制。

A supramolecular metal-organic gel based on biscarboxyl-functionalized benzimidazole derivative was prepared by silver nitrate and a simple ligand（L17）.The adsorption capability of MOG for rhodamine B,methyl orange and malachite green were studied,the results showed that,in aqueous phases,MOG can adsorb methyl orange molecules selectively.More study indicated that,when the dosage was 5mg,adsorption time was 40~60min,the ratio of gel factors and metal ions was 1∶1,pH value was 5~11,the adsorption performance reached optimum one.Absorption behavior of MOG for methyl orange conformed to liquid film diffusion model.Isotherm adsorption process can be well described by Langmuir and Freundlich models.