Statistical mechanics of multilayer sorption: Extension of the Brunauer–Emmett–Teller (BET) and Guggenheim–Anderson–de Boer (GAB) adsorption isotherms

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Dutcher, Cari S., Ge, Xinlei, Wexler, Anthony S. and Clegg, Simon L. (2011) Statistical mechanics of multilayer sorption: Extension of the Brunauer–Emmett–Teller (BET) and Guggenheim–Anderson–de Boer (GAB) adsorption isotherms. The Journal of Physical Chemistry C, 115 (33). pp. 16474-16487. ISSN 1932-7447

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Abstract

Adsorption isotherms have important practical applications, including in solution chemistry where they have been used to model solvent and solute activities in liquid mixtures at extreme concentrations, such as pure melts. The conventional Brunauer–Emmett–Teller (BET) and Guggenheim–Anderson–de Boer (GAB) models are less successful for dilute solutions (high water activities), for which most data are available. In this work we extend these models to include arbitrary numbers of additional adsorbed monolayers and, using statistical mechanics, derive expressions for the Gibbs energies of solutions and for solute and solvent activities. We demonstrate consistency with results that can be obtained by other methods, and show how a particular simple case is equivalent to Raoult’s law. Test applications of the equations to water activity data for aqueous solutions over very wide ranges of concentration show that the addition of a single extra adsorbed layer to the fitted adsorption model greatly increases its accuracy, especially for low concentrations.

Item Type:	Article
Faculty \ School:	Faculty of Science > School of Environmental Sciences
UEA Research Groups:	Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences Faculty of Science > Research Groups > Marine and Atmospheric Sciences (former - to 2017) Faculty of Science > Research Groups > Climate, Ocean and Atmospheric Sciences (former - to 2017)
Related URLs:	http://dx.doi.org/10.1021/jp203879d
Depositing User:	Users 2731 not found.
Date Deposited:	05 Mar 2012 14:37
Last Modified:	16 Jan 2024 01:19
URI:	https://ueaeprints.uea.ac.uk/id/eprint/37847
DOI:	10.1021/jp203879d

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