Temperature dependence of cadmium adsorption on oxides. I. Experimental observations and model analysis

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

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The influence of temperature on the adsorption of cadmium on rutile (TiO2) and hematite (α-Fe2O3) is measured at different values of the (initial) surface charge density and salt concentration. The formation of cadmium hydroxo-complexes in solution is simultaneously investigated. Experimental adsorption results are analyzed in terms of the Frumkin-Fowler-Guggenheim model, using a Gouy-Stern double layer picture. Thermodynamic analysis points to a great similarity between the binding of Cd2+ with hydroxyl groups on the surface and with OH- ions in solution. Both processes are entropically driven.

Original languageEnglish
Pages (from-to)118-131
Number of pages14
JournalJournal of Colloid and Interface Science
Issue number1
Publication statusPublished - 1 Mar 1990
Externally publishedYes

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