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Modelling titration curves of mixed materials with variable and permanent surface charge: theory

AuthorsMadrid, Luis ; Díaz Barrientos, Encarnación
Issue DateSep-1987
PublisherSociedad Española de Arcillas
CitationThe Sixth meeting of the European Clay Groups: 357-359 (1987)
AbstractThe adsorption of potential-determining ions by variable charge surfaces has been extensively studied, and various mathematical models have been applied to the data. However, only two of these models have proved to be highly successful, those given by Bowden et al. (1977) and by Davis et al. (1978). The former considers the interface divided in various planes of electric potential, and supposes the adsorption of p.d.i. to happen in the inner plane, while the electrolyte ions are adsorbed in a second, outer plane. A third plane defines the beginning of the Gouy diffuse layer. The amount of charge in each of the first two planes is calculated by a Stern-type equation, snd two electric capacitances are defined between each pair of planes. Instead, the Davis model considers the adsorption of each p.d.i. to happen at a particular surface site, which becomes charged, and each electrolyte ion adsorbed is associated with one of those charged sites.
Description3 pages, 5 references. Congreso celebrado del 7-10, septiembre, 1987, Sevilla, España. EUROCLAY'87.
Appears in Collections:(IRNAS) Comunicaciones congresos
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