壳聚糖对蔗糖溶液中单宁酸的吸附性能研究

周友全; 唐婷范; 程昊; 黄芳丽; 田玉红

doi:10.13386/j.issn1002-0306.2020.03.003

壳聚糖对蔗糖溶液中单宁酸的吸附性能研究

Study on Adsorption Properties of Chitosan for Tannic Acid in Sucrose Solution

摘要

摘要: 目的:进行壳聚糖对蔗糖溶液中单宁酸的性能研究。方法:通过吸附动力学和吸附等温线的考察,将吸附动力学实验数据采用粒内扩散模型、准一级动力学模型和准二级动力学模型线性拟合,吸附等温线数据采用Langmuir模型和Freundlich模型线性拟合。结果:在单宁酸的初始浓度为100 mg/L和250 mg/L时,壳聚糖对蔗糖溶液中单宁酸的吸附动力学用准二级动力学模型的拟合效果最好(R²=0.9993和0.9957);壳聚糖对蔗糖溶液中单宁酸的吸附等温线用Langmuir模型拟合效果最好(R²=0.9977)。结论:该吸附属于单分子层的化学吸附,理论饱和吸附量为107.53 mg/g。

Abstract: Objective:The effect of chitosan on tannic acid in sucrose solution was studied.Methods:Through the investigation of adsorption kinetics and adsorption isotherm,the experimental data of adsorption kinetics were linearly fitted by intraparticle diffusion model,preudo-first-order kinetics model and preudo-second-order kinetics model,and the adsorption isotherm data were linearly fitted by Langmuir model and Freundlich model.Results:When the initial concentration of tannic acid were 100 mg/L and 250 mg/L,the preudo-second-order kinetics model were better to fit the adsorption kinetics of tannic acid in sucrose solution(R² were 0.9993 and 0.9957,respectively),and the Langmuir model was the best to fit the adsorption isotherm of tannic acid in sucrose solution(R²=0.9977).Conclusion:The adsorption belongs to the chemical adsorption of single molecular layer,and the theoretical saturated adsorption capacity was 107.53 mg/g.