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ISRN Nanomaterials
Volume 2012 (2012), Article ID 304546, 6 pages
http://dx.doi.org/10.5402/2012/304546
Research Article

Influence of the Percentage of TiO2 Doped into SiO2 Matrix on Photocatalysis

Chemistry Department, Universidade de Franca, Avenida Dr. Armando Salles Oliveira, 201—Parque Universitário, 14404-600 Franca, SP, Brazil

Received 18 June 2012; Accepted 31 July 2012

Academic Editors: M. C. Garcia-Gutierrez, I. Kholmanov, and J. Majimel

Copyright © 2012 L. M. L. da Silva et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The sol-gel process was employed in the preparation of titania-doped spherical nanosilica for application in photocatalysis. To this end, the silica matrix was doped with 1 and 10% titania, and the catalytic activity of the resulting solids in the degradation of rhodamine was tested. The synthesized materials were thermally treated at 120, 400, and 800°C. Differential thermal analysis did not evidence the titania-phase transition from anatase to rutile. Scanning electron microscopy revealed the formation of monodisperse spherical nanoparticles with sizes varying between 400 and 500 nm. The UV-Vis absorption spectra showed that the silica doped with 10% titania promoted 86% rhodamine degradation within 90 minutes, as compared to 40% in the case of the silica containing 1% titania. The silica matrix was demonstrated to affect the titania-phase transformation.