Thermodynamic and kinetic studies of adsorption of 1-butyl-3- methylimidazole chloride ionic liquid onto PAA hydrogel
聚丙烯酸水凝胶对氯化-1-丁基-3-甲基咪唑离子液体的吸附热力学和动力学研究

A super absorbent of PAA hydrogel was prepared by solution polymerization method. The pH value and the temperature of solution had an effect on the adsorption of 1-butyl-3-methylimidazole chloride ionic liquid onto PAA hydrogel. The results showed that the adsorption capacities of 1-butyl-3-methylimidazole chloride ionic liquid increased with increasing pH value. When pH=2~4, the adsorption capacities increased significantly,while pH was 4, it increased slowly with increase of pH. The adsorption capacities of ionic liquid decreased with increasing temperature. The adsorption behavior of 1-butyl-3-methylimidazole chloride could be described reasonably well by Langmuir isotherm. Chemical adsorption may be inferred by the activation energy Ea (Ea=52.470 kJ/mol)of adsorption obtained from the pseudo-second-order kinetic model.