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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.
In this paper, the adsorption behavior of low-fat pectin on rare-earth cerium ions was studied. The effects of adsorption time, pH value of cerium ion solution, adsorption temperature, pectin concentration and cerium ion concentration on the adsorption capacity of pectin were studied. Langmuir and Freundlich Model was used to analyze the adsorption process.According to the adsorption isotherm, the relevant thermodynamic and kinetic parameters were calculated and the samples were analyzed by infrared spectroscopy.The results showed that the variables studied significantly affected the adsorption capacity of pectin to cerium ions , The infrared spectra of pectin changed obviously before and after adsorption, indicating that chemical reaction may occur in the adsorption process.Compared with the Langmuir model, the Freundlich model is more suitable for describing the adsorption process of pectin on cerium ions.The adsorption process follows the pseudo First-order kinetic equations. Enthalpy and entropy change are the driving forces for the adsorption process.