INQUIMAE   12526
INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
artículos
Título:
Tungsten Doped TiO2 vs Pure TiO2 Photocatalysts: Effects on Photobleaching Kinetics and Mechanism
Autor/es:
N. COUSELO; F. S. GARCÍA EINSCHLAG; R. J. CANDAL; M. JOBBÁGY
Revista:
The Journal of Physical Chemistry C
Editorial:
ACS
Referencias:
Año: 2008 vol. 112 p. 1094 - 1094
Resumen:
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.