功能基团密度对离子交换过程的影响 Ⅱ.惰性单体对羧酸树脂吸附庆大霉素的影响

Effect of functional group density on ion exchange process Ⅱ. Influence of introduction of inert monomer on gentamicin adsorption onto carboxylic resins

以丙烯酸甲酯 (MA)与二乙烯基苯为单体 ,改变惰性单体甲基丙烯酸甲酯 (MMA)的加入量 ,悬浮共聚合成大孔白球 ,在一定水解反应时间下 ,合成了一系列不同功能基团密度的树脂。从树脂的滴定曲线和静态、动态吸附实验中 ,得到了它们的总交换容量和对庆大霉素的交换容量 ,因此也得到了相对交换容量。最后通过含钙离子庆大霉素溶液的静态吸附实验 ,比较树脂的选择性。结果表明 ,MMA加入量为 3 %的树脂相对交换容量达到 97 98% ,对庆大霉素吸附量最大 。

A number of macroporous weak acidic resins with different functional group densities were prepared by suspension copolymerization of methyl acrylate and divinylbenzene with the introduction of various amounts of an inert monomer, methyl methacrylate under the subsequent alkaline hydrolysis. With their titration curves determined and from the static and dynamic adsorption experiments, their total exchange capacities and capacities for gentamicin adsorption were determined and their relative exchange capacities were calculated. Finally their selectivities were compared by the static adsorption experiments from gentamicin solution containing calcium ion. Results showed that the resin with 3% of methyl methacrylate was superior, with a relative exchange capacity of 97 98%, and with the highest adsorption capacity of gentamicin but the least adsorption of calcium ion.