Temperature dependence of the electrical double layer on oxides: Rutile and hematite

L. G.J. Fokkink, A. de Keizer, J. Lyklema

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Abstract

The surface charge σ0 on aqueous suspensions of hematite and rutile was measured as a function of pH in various KNO3 concentrations and at different temperatures. Two types of congruences were observed: (a) if σ0 is plotted as a function of the pH minus the pzc, curves on these two oxides coincide at the same KNO3 concentrations and (b) the same is observed for σ0 as a function of temperature. Thermodynamic analysis enabled us to separate double layer parameters into oxide-specific and generic contributions. Standard Gibbs energies, enthalpies, and entropies for proton adsorption were obtained.

Original languageEnglish
Pages (from-to)116-131
Number of pages16
JournalJournal of Colloid and Interface Science
Volume127
Issue number1
DOIs
Publication statusPublished - 1 Jan 1989
Externally publishedYes

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