INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
Tungsten Doped TiO2 vs Pure TiO2 Photocatalysts: Effects on Photobleaching Kinetics and Mechanism
N. COUSELO; F. S. GARCÍA EINSCHLAG; R. J. CANDAL; M. JOBBÁGY
The Journal of Physical Chemistry C
Año: 2008 vol. 112 p. 1094 - 1094
Sol gel prepared tungsten (VI) doped TiO2 powders were evaluated as photocatalysts for crystal violet (CV)bleaching under UV irradiation, in the presence of oxygen. The incorporation of the hexavalent cation affectsboth surface and bulk properties. The optimum activity observed results from the competition between highersurface areas and lower specific activities per adsorption site. At pH 4.0, doped particles share a commonphotodegradation mechanism, where the relative contribution of the aromatic structure rupture over the lossof terminal methyl groups (N-demethylation) is more relevant than in the case of non-doped titania. Thisbehavior can be minimized shifting the pH into basic condition.