【摘要】 醋酸乙烯酯与异氰尿酸三烯丙酯经悬浮聚合后醇解制备的聚乙烯醇基质树脂,有较好的亲水性,将其含有的羟基进行羧基功能基化,制备了3种不同基团的羧基树脂,用化学滴定法测定了树脂的羧基含量,基质树脂的羟基转化率分别为PVA-CM为20.0%、PVA-SuA为47.6%、PVA-TPA为57.2%。3种羧基化树脂及基质树脂对赖氨酸的吸附性能用静态吸附等温线方法测定。结果表明,25℃在2.0~80.0mmol/L浓度范围内树脂对赖氨酸的吸附等温线符合Freundlich方程;吸附能力顺序为PVA-SuA>PVA-CM>PVA>PVA-PTA。考察了羧丙酸酯树脂PVA-SuA对初始浓度为50.90mmol/L赖氨酸的吸附动力学。实验结果表明,其对赖氨酸的吸附符合二级动力学模型。更多还原

【Abstract】 Polyvinyl alcohol(PVA) matrix resins were obtained from the suspension polymerization of vinyl acetate triallyl isocyanurate followed by alcoholysis. Three carboxylic resins with hydrophilic PVA matrix containing hydroxyl groups were prepared by the introduction of diverse carboxylic groups such as carboxylic methyl, succinic and p-phthalic acid. The conversion rates of hydroxyl groups determined by the chemical titrimetric analysis for the 3 matrix resins were 20.0%, 47.6%, 57.2%, respectively. The adsorption characteristics of L-lysine in aqueous solution on the three carboxylic and PVA resins were measured by the static adsorption isotherms. The equilibrium adsorption data were fitted to Freundlich adsorption isotherm model to evaluate the model parameters. The result shows that the adsorption isotherm data can be satis-factorily fitted with the Freundlich equation within a range of concentration 2.0～80.0 mmol/L at 298 K. At the same time, the result of dynamic adsorption of L-lysine on PVA-SuA with the initial concentration under 50.90 mmol/g shows that a pseudo-second-order equation can be used to interpret the kinetic curve and the correlation is good.更多还原