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In the present work,the equilibrium adsorption of theophylline was studied by phenolic resin adsorbents: JDW|2(made by ourselves) and Duolite S|761 within a temperature range of 303_323 K. The experimental results show that the Freundlich adsorption law is applicable to the adsorption of theophylline on the two adsorbents,the exponents %n%>1 indicate that they are favorable to the adsorptions;the negative values of all the isosteric adsorption enthalpies for the theophylline indicate the exothermic process of the adsorption,while the range(10_40 kJ/mol) of their magnitudes manifests the physisorption process;other thermodynamic properties,the free energy changes and the entropy change associated with adsorption have been calculated from the Gibbs adsorption equation and the Gibbs|Helmholtz equation.
In the present work, the equilibrium adsorption of theophylline was studied by phenolic resin adsorbents: JDW | 2 (made by ourselves) and Duolite S | 761 within a temperature range of 303 _ 323 K. The experimental results show that the Freundlich adsorption law is applicable to the adsorption of theophylline on the two adsorbents, the exponents % n %> 1 indicate that they are favorable to the adsorptions; the negative values of all the isosteric adsorption enthalpies for the theophylline indicate the exothermic process of the adsorption, while the range (10 - 40 kJ / mol) of their magnitudes manifests the physisorption process; other thermodynamic properties, the free energy changes and the entropy change associated with adsorption have been calculated from the Gibbs adsorption equation and the Gibbs | Helmholtz equation.