果胶吸附稀土金属 La3+的热力学和动力学

Thermodynamics and Dynamics of Adsorption of Rare Earth Metal La3+ by Pectin

摘要: 研究了低脂果胶对稀土金属 La3+的吸附性能及果胶对 La3+的吸附等温线.根据吸附等温线计算了相关热力学参数并对吸附过程进行动力学研究.结果表明:低脂果胶对 La3+的吸附过程容易进行,吸附过程更适合用Freundlich模型来描述,果胶对 La3+的吸附符合准一级吸附动力学过程,吸附过程中起到主导作用的是吸附时间.

Abstract: The adsorption of rare earth metal La3+ by low viscosity pectin was carried out, and the adsorption isotherms were studied. The thermodynamic parameters were calculated according to the adsorption isotherms, and the kinetics of the adsorption process was also investigated. The results indicate that the adsorption process is easy to proceed, and the Freundlich model is more suitable for the description of the adsorption process. The adsorption of La3+ by pectin accords with the quasi
first order adsorption kinetics, and the adsorption time plays a dominant role in the adsorption process.