Advances in the Mechanism of Deposition of MoO2-4 and Mo7O6-24 Species on the Surface of Titania Consisted of Anatase and Rutile

Journal of Colloid and Interface Science
Kyriakos BourikasAlexis Lycourghiotis

Abstract

The mechanism of deposition of MoO2-4 and MoO7O6-24 from electrolytic solution on the surface of industrial titania consisting of anatase and rutile patches was further investigated following a recently developed methodology. The methodology is based on the "2pk/one site" and "triple-layer" models. It involves the writing down of various deposition equilibria, derivation of the corresponding equations, calculation of the amount of each of the deposited Mo(vi) species and the total amount of deposited Mo(vi) at various pH and concentrations, calculation of the variation with pH of the zeta potentials and of the difference in H+ ion consumption by the support surface in the presence and absence of MoO2-4 and Mo7O6-24 species in the impregnating solution. Comparison of the calculated parameters and variations mentioned above with the corresponding ones obtained by deposition experiments, potentiometric titrations, and microelectrophoresis allowed us to establish the mechanism of deposition of the Mo(vi) species on the surface of titania. It was found that the deposition of MoO2-4 and Mo7O6-24 species on the surface of "anatase regions" of the industrial titania takes mainly place by the following equilibria in the pH range 9.0-4.6...Continue Reading

Citations

Jan 19, 2011·Chemistry : a European Journal·Kyriakos BourikasAlexis Lycourghiotis

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