CRCU

Chemical Research in Chinese Universities ›› 2004, Vol. 20 ›› Issue (3): 373-376.

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Studies on Thermodynamic Properties of Adsorption of Theophylline by Phenolic Resin Adsorbents

WANG Zhong1,2, SHI Zuo-qing2, SHI Rong-fu2, FAN Yun-ge2, YAN Yi-Zhong2   

  1. 1. Shenyang College of Chemical Technology, Shenyang 110021, P. R. China;
    2. The State Key Laboratory of Functional Polymer Materials for Adsorption and Separation, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, P. R. China
  • Received:2003-01-24 Online:2004-06-24 Published:2011-08-06
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.20174017).

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Abstract: 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.

Key words: Phenolic resin, Adsorbent, Theophylline