米格列醇在大孔D001树脂上的离子交换性研究

为掌握米格列醇在离子交换树脂上的吸附行为,采用改变恒温振荡器的温度、震荡速率和溶液pH值来研究固定浓度的米格列醇溶液在定量树脂上的离子交换吸附行为,并结合热力学和动边界模型对交换过程进行分析.结果表明:吸附温度增大,分配系数KD变小,吉布斯函数值△G变大,不利于离子交换吸附,离子交换过程为放热过程；米格列醇溶液在中性条...

Ion exchange behavior of Miglitol by macroporous D001 resin

The ion exchange adsorption behavior of fixed Miglitol in the quantitative resin was investigated at different temperature,pH and stirring rate.The ion exchange process was also analyzed by thermodynamic theory and the dynamic boundary model.The results show that the adsorption temperature rises,the distribution coefficient KD is smaller and the Gibbs value ΔG is greater,which is more detrimental to ion exchange,and the adsorption of Miglitol in the resin is an exothermic process.The Miglitol ions in neutral conditions can be adsorbed better than that in the acidic or alkaline conditions,and implies that the acidic or alkaline cations of solution can affect ion adsorption of Miglitol on D001.The temperature was changed to explore the changes of adsorption capacity of resin,and the mathematics models of film diffusion,particle diffusion and chemical reaction were used to fit the experimental data respectively.It indicates that the model of film diffusion fit the best,and the adsorption of Miglitol is controlled mainly by film diffusion.The adsorption rate is obviously enhanced with the increase of stirring rate of oscillator,but the effect of stirring rate on the adsorption rate of resin tends to weaken or even disappear when the stirring rate of oscillator exceeds a certain value.