Abstract:

Thermodynamic adsorption characteristics of Chaenomeles sinensis polyphenols onto NKA-9 resin were studied. Results showed that adsorption equilibrium data obtained within the temperature range of 298－308 K and concentration range of 20－40 mg/mL could be well fitted by the Langmuir-type and Freundlich-type isotherm equations and the adsorption was favorable type. Meanwhile, the changes of enthalpy, free energy and entropy were measured. It was indicated that the adsorption was an endothermic process.

Key words: Chaenomeles sinensis polyphenols, NKA-9 resin, adsorption equilibrium, adsorption thermodynamics