离子强度与温度对大孔树脂吸附红霉素A的影响

Effects of Ionic Strength and Temperature on the Adsorption of Erythromycin A on Macroporous Resin

通过间歇实验,研究了温度与离子强度(NaCl)对大孔树脂吸附红霉素A过程的影响。结果表明:SP825大孔树脂对红霉素A的平衡吸附量最大,符合Langmiur等温吸附方程。升高温度和提高离子强度有利于红霉素A的吸附。同时,计算了红霉素A在SP825上的吉布斯自由能变、吸附焓变与吸附熵变,表明吸附过程为吸热的物理吸附。此外,采用液膜与粒内扩散模型较好地拟合了吸附动力学数据,并计算得到了液膜扩散系数kf和孔内扩散系数Dp。结合这些动力学与热力学参数,初步解释了离子强度与温度对吸附过程的影响。

Effects of temperature and ionic strength （NaC1） on the adsorption of erythromycin A （EA） in macroporous resin were studied via batch experiments. Results showed that the highest equilibrium adsorption capacity was obtained when SP825 macroporous resin was employed. The data were well described by Langmuir isotherm equation. The saturation adsorption quantity increases with the increasing of temperature and ionic strength. Meanwhile, free energy, enthalpy and entropy of the adsorption were calculated which indicated that the adsorption process was physical endothermic. Furthermore, the dynamic adsorption data were well described by film and pore diffusion models, and the film diffusion coefficient kf and pore diffusion coefficient Dp were thus calculated. The preliminary explanation for the effects of ionic strength and temperature on the adsorption process were discussed based on those kinetic and thermodynamic data.