果胶对稀土金属Ce4+的吸附研究

Study on the adsorption of rare earth metal cerium ions (IV) by pectin

摘要:

本文研究了低脂果胶对稀土金属铈离子的吸附性能。研究了吸附时间、铈离子溶液的pH、吸附温度、果胶用量、铈离子浓度对果胶吸附容量的影响。分别用Langmuir和Freundlich模型对吸附过程进行了分析。根据吸附等温线，计算了相关的热力学和动力学参数，并用红外光谱对样品进行了分析。结果表明，所研究的变量显著地影响果胶对铈离子的吸附容量，吸附前后果胶的红外光谱发生了明显的改变，说明吸附过程中可能发生了化学反应。与Langmuir模型相比，Freundlich模型更适合用来描述果胶对铈离子的吸附过程。吸附过程遵循伪一级动力学方程。焓变和熵变是吸附过程的驱动力。

Abstract:

The adsorption of rare earth metal cerium ions by low fat pectin was determined. The effects of the adsorption time, pH of the cerium ion solution, adsorption temperature, dosage of pectin and concentration of cerium ions on the adsorption capacity of pectin were investigated. The adsorption process was analyzed by the Langmuir and Freundlich models. Using the adsorption isotherm, the related thermodynamic and kinetic parameters were calculated, and infrared spectrum analysis was performed. The results indicate that the variables studied significantly affect the adsorption of cerium ions by pectin and that the infrared spectra before and after adsorption are apparently different, implying that a chemical reaction may have occurred in the adsorption process. The Freundlich equation is better suited to describe the adsorption process compared to the Langmuir equation. The adsorption process is best described by a pseudo-first order kinetics equation. Enthalpy and entropy differences are the driving forces of the adsorption process.