Evaluation of surface potential from single crystal electrode potential: Application of Saddle point method for sapphire A crystal plane

The new method of evaluation of the point of zero potential for the metal oxide exhibiting a saddle-like surface potential function Ψ 0 (pH), as obtained by acid base potentiometric titration using Single Crystal Electrode, was proposed. The electrode potential of sapphire single crystal electrode (...

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Bibliographic Details
Published in:Adsorption : journal of the International Adsorption Society 2013-04, Vol.19 (2-4), p.259-267
Main Authors: Preočanin, Tajana, Kallay, Nikola
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Engineering Thermodynamics
Heat and Mass Transfer
Industrial Chemistry/Chemical Engineering
Surfaces and Interfaces
Thin Films
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Summary:The new method of evaluation of the point of zero potential for the metal oxide exhibiting a saddle-like surface potential function Ψ 0 (pH), as obtained by acid base potentiometric titration using Single Crystal Electrode, was proposed. The electrode potential of sapphire single crystal electrode (A crystal plane, ) was measured, point of zero potential and surface potentials were evaluated, and the results were analyzed using the Surface Complexation Model. The electroneutrality point corresponding to the point of zero potential was found to be at pH pzp =7.0. Thermodynamic protonation equilibrium constants for the first and the second step of protonation were obtained as ; .
ISSN:0929-5607
1572-8757
DOI:10.1007/s10450-012-9448-5