H1020树脂吸附糖精的动力学和热力学研究

Kinetics and Thermodynamics of Adsorption of Saccharin on H1020 Macroporous Resins

研究了大孔树脂H1020对糖精(邻苯甲酰磺酰亚胺)的吸附性能。在温度为303.15、308.15、313.15和318.15 K条件下分别测定了吸附平衡数据。分别采用了拟一级动力学模型和拟二级动力学模型对实验数据进行模拟,结果表明拟二级动力学方程更适合描述H1020型大孔树脂对糖精的吸附过程。用Langmuir和Freundlich吸附等温方程对实验数据进行拟合,结果表明糖精在大孔树脂H1020上的吸附平衡符合Freundlich吸附等温方程。计算糖精吸附过程的吸附焓变、吸附自由能和吸附熵变,根据吸附热力学值可判断出H1020型大孔树脂对糖精的吸附过程是自发的、放热的物理吸附。

The adsorption capability of macroporous resin H1020 for saccharin （o-benzoic sulfimide） was studied. The adsorption equilibrium experiments were conducted under 303.15, 308.15, 313.15 and 318.15 K. The experimental data were fitted to pseudo-first order model and pseudo-second order model respectively. The adsorption process of saccharin on macroporous resin H1020 could be described better by pseudo-second order model. The adsorption data are correlated with the Langmuir and Freundlich isotherm equation. The results showed that Freundlich isotherm equation was better to describe the isother- mal adsorption of saccharin on the macroporous resin. The values of the thermodynamic parameters including the changes in Gibbs free energy, enthalpy and entropy are calculated. We can conclude from these thermodynamic parameters that the adsorption process of saccharin on macroporous resin H1020 is spontaneous and exothermic physical adsorption.