红霉素在大孔树脂上的吸附动力学研究

采用液膜及孔内扩散模型,模拟不同温度和不同红霉素(EM)初始浓度条件下,大孔吸附树脂HZ816及XAD16吸附红霉素的动态吸附曲线,并获得液膜传质及孔内扩散系数;考察了温度及溶质浓度对红霉素在两种树脂中吸附动力学的影响.结果表明,在实验范围内,红霉素在HZ816和XAD16两种树脂上的吸附平衡数据满足Langmuir吸附等温线方程,液膜及孔内扩散模型能较好地描述红霉素在两种树脂上的吸附动力学,同时,模型拟合得到的液膜传质系数随着温度的升高而增大,随着初始浓度的增大而增大,孔内扩散系数随着温度的升高而增大,随着初始浓度的增大而减小.

Adsorption Kinetics of Erythromycin on Macroporous Resins

The effects of temperature and initial concentration of erythromycin (EM) on the diffusion of EM in macroporous resins, HZ816 and Amberlite XA16, were studied via batch adsorption experiments. The film and pore diffusion model was used to analyze the diffusive mass transfer of EM in both mentioned resins. The diffusivity of EM was determined by fitting the adsorption rate curves for different temperatures and initial EM concentrations, and the film mass transfer coefficient and pore diffusion coefficient were obtained too. It was found that, under the experimental conditions, the equilibrium adsorption data of EM on macroporous resins fit the Langmuir isotherms well, and the kinetic analysis shows that the adsorption process can be well described by the film and pore diffusion model. The film mass transfer coefficient increases with the increase of temperature and initial EM concentration, and the pore diffusion coefficient increases with the increase of temperature too but decreases with the increase of initial EM concentration.