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

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.