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Considerations about the correct evaluation of sorption thermodynamic parameters from equilibrium isotherms

Authors
Journal
The Journal of Chemical Thermodynamics
0021-9614
Publisher
Elsevier
Volume
68
Identifiers
DOI: 10.1016/j.jct.2013.09.013
Keywords
  • Sorption
  • Sorption Isotherms
  • Thermodynamic Parameters
  • Standard State
  • Isosteric Heat
Disciplines
  • Physics

Abstract

Abstract This is a comparative analysis of popular methods currently in use to derive sorption thermodynamic parameters from temperature dependence of sorption isotherms. It is emphasized that the standard and isosteric thermodynamic parameters have sharply different meanings. Moreover, it is shown with examples how the sorption model adopted conditions the standard state and consequently the value of ΔG° and ΔS°. These trivial but often neglected aspects should carefully be considered when comparing thermodynamic parameters from different literature sources. An effort by the scientific community is needed to define criteria for the choice of the standard state in sorption processes.

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