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Analysis of low vapor pressure region of adsorption isotherm

I. Statistical thermodynamics of adsorption by a multi-component surface

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Summary

In order to explain the low relative vapor pressure region in experimental adsorption isotherms of polar small molecules by polar adsorbents — as is the case with the protein-water system — the statistical thermodynamics of adsorption by a multi-component surface was studied on the basis of the BET model. The derived adsorption isotherm gives the same expression as the simple summation of the BET equation over all kinds of polar sites. The mathematical examination reveals a condition necessary for the approximation of the derived adsorption isotherm to the usual straight “BET” line. Besides, according to the present theory, it is possible to derive the number and weight averages of adsorption energy factors (C of BET theory) by the analysis of low vapor pressure region.

Zusammenfassung

Die Adsorption kleiner polarer Moleküle an polaren Adsorbentien, z. B. Wasser an Proteinen, wurde auf der Basis des BET-Modells im Bereich kleiner relativer Dampfdrücke mit den Methoden der statistischen Thermodynamik behandelt.

Nach der entwickelten Theorie ist es möglich, die Anzahl und das durchschnittliche Gewicht von Adsorptionsenergiefaktoren zu ermitteln.

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Author notes

  1. Akira Takizawa

    Present address: Faculty of Textile Technology, Tokyo Institute of Technology, Tokyo, Japan

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    1. Akira Takizawa
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    Takizawa, A. Analysis of low vapor pressure region of adsorption isotherm. Kolloid-Z.u.Z.Polymere 222, 141–143 (1968). https://doi.org/10.1007/BF01510796

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    • DOI: https://doi.org/10.1007/BF01510796

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