Adsorption kinetics, isotherm and thermodynamics studies of flavones from Vaccinium Bracteatum Thunb leaves on NKA-2 resin
作者： Yiyong Chen , Dejin Zhang
DOI: 10.1016/J.CEJ.2014.05.120
关键词: Freundlich equation 、 Gibbs free energy 、 Exothermic reaction 、 Desorption 、 Flavones 、 Adsorption 、 Thermodynamics 、 Chemistry 、 Kinetics 、 Enthalpy
摘要: Abstract In this paper, the adsorption and desorption characteristics of flavones from Vaccinium Bracteatum Thunb leaves (VBTL) were investigated using NKA-2 resin to separate VBTL. Based on static experiments with resin, kinetics, isotherms thermodynamics VBTL investigated. Results showed that had a good performances for VBTL, capacity was 9.55 mg/g, ratios 57.88% 76.54%, respectively. It found Freundlich isotherm model pseudo first-order suitable characterize process adsorption. The values thermodynamic parameters including changes Gibbs free energy (ΔG∗), entropy (ΔS∗) enthalpy (ΔH∗) demonstrated spontaneous exothermic. controlled by physical mechanism rather than chemical mechanism.
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