Specific adsorption of organic cations at the silver iodide-electrolyte interface

A. de Keizer, L. G J Fokkink

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The adsorption of monovalent tetrabutylammonium cations and bivalent bipyridinium cations diquat and paraquat on AgI has been studied as a function of surface charge density in 0.1 M indifferent (1-1) electrolyte. Adsorption results are analyzed according to the Frumkin-Fowler-Guggenheim isotherm. The model allows analysis of the several chemical and electrostatic free enthalpy contributions both to the lateral and to the adsorbent-adsorbate interactions. Hydrophobic interactions are shown to be the major non-Coulombic driving force for adsorption. The influence of adsorbate valency is consistently accounted for by the model.

Original languageEnglish
Pages (from-to)323-337
Number of pages15
JournalColloids and Surfaces
Issue numberC
Publication statusPublished - 1 Jan 1990
Externally publishedYes

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