Modeling of type IV and V sigmoidal adsorption isotherms

Physical Chemistry Chemical Physics : PCCP
Christoph Buttersack

Abstract

Based on the biochemical theory of multiple ligand-receptor complexes (Klotz (1946)) a sigmoidal proceeding adsorption isotherm is derived. The special case of an arbitrarily large number of equal interaction sites and a separate one yields an equation which corresponds to the ζ-isotherm, disparately derived by Ward et al. (2007) for surface tension of solid-fluid interfaces. From the mathematical point of view it is analogous to the BET-isotherm for a limited number of adsorption layers (1938). It is shown that the isotherm maps type IV and V isotherms. The isotherm is compared with others including the type IV isotherm of Do and Do (2009). The present isotherm is unified in contrast to existing hybrid models. It is successfully applied to numerous literature data concerning the adsorption of water on microporous carbon and aluminophosphate molecular sieves.

References

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Citations

Apr 20, 2020·Environmental Science and Pollution Research International·Laxmipriya PandaPramila K Misra
Dec 10, 2020·Physical Chemistry Chemical Physics : PCCP·Seishi Shimizu, Nobuyuki Matubayasi
Apr 17, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Hoa T PhanAmanda J Haes
Aug 20, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Seishi Shimizu, Nobuyuki Matubayasi
Jan 16, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Sinuo TanMilton T W Hearn
May 29, 2020·ACS Applied Materials & Interfaces·Pavel S ZelenovskiyAndrei L Kholkin

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Methods Mentioned

BETA
small-angle neutron scattering

Software Mentioned

Excel
SigmaPlot

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