Determinação do perfil de distribuição de dopantes em fotocatalizadores a base de TiO2: um estudo teórico e experimental

Abstract

In this work, we studied based on TiO 2 photocatalysts doped with chromium. We prepared films of titanium dioxide doped with chromium, there have been heat treated to there be conversion to the phase of TiO2 anatase form and also that there was migration of the chromium doping into the interior of the films. Characterized the depth of penetration of doping by the technique grazing incidence x-ray fluorescence (GIXRF) and also evaluated to determine the photocatalytic activity of films of model compound for degradation of methylene blue. There were also theoretical calculations, in order to understand how it occurs the diffusion of dopant atoms within the TiO2 films. From the results, it appears an improvement in catalytic activity of chromium-doped films that received heat treatment, and that there should also be preferred in the interior regions of the films where the dopant atoms are found, when it diffuse to the interior of the films.