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[Objective] To study the kinetics and thermodynamics characteristics of hypericin adsorbed by D101 macroporous resin.[Method] The pseudo-first-order kinetics model,pseudo-second-order kinetics model and Kannan equation of intra-particle diffusion were used to fit the kinetics process of hypericin adsorbed by D101 macroporous resin,and Langmuir model,Freundlich model,Temkin model and Origin soft were used to fit the thermodynamics process of hypericin.[Result] The adsorption of hypericin by D101 macroporous resin conformed to the pseudo-second-order kinetics equation,and it was demonstrated from the results of thermodynamics study that adsorption of hypericin by D101 macroporous resin conformed to Freundlich adsorption isotherm equation.The enthalpy changes △H<0 indicated that the absorption was an exothermic process,and |△H | < 20 kJ/mol revealed that the absorption process was physical adsorption.Meanwhile,the free energy changes △G<0 indicated that the absorption was a spontaneous process;the entropy changes △S>0 demonstrated that the absorption process was the process of entropy increase.[Conclusion] The study provides theoretical basis for industrial production of isolation and purification of hypericin through macroporous resin.
[Objective] To study the kinetics and thermodynamics characteristics of hypericin adsorbed by D101 macroporous resin. [Method] The pseudo-first-order kinetics model, pseudo-second-order kinetics model and Kannan equation of intra-particle diffusion were used to fit the kinetics process of hypericin adsorbed by D101 macroporous resin, and Langmuir model, Freundlich model, Temkin model and Origin soft were used to fit the thermodynamics process of hypericin. [Result] The adsorption of hypericin by D101 macroporous resin conformed to the pseudo-second- order kinetics equation, and it was demonstrated from the results of thermodynamics study that adsorption of hypericin by D101 macroporous resin conformed to Freundlich adsorption isotherm equation. ΔH <0 indicated that the absorption was an exothermic process, and | ΔH | <20 kJ / mol revealed that the absorption process was physical adsorption. Meanwhile, the free energy changes △ G <0 indicated that the absorption was a spontaneity The conclusion is that the absorption process was the process of entropy increase. [Conclusion] The study provides theoretical basis for industrial production of isolation and purification of hypericin through macroporous resin.