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International Journal of Photoenergy
Volume 2006 (2006), Article ID 85469, 6 pages
http://dx.doi.org/10.1155/IJP/2006/85469

Photoelectrochemical characterization and photocatalytic properties of mesoporous TiO2/ZrO2 films

1Institute of Surface Chemistry, Ukrainian National Academy of Sciences, 17 Gen. Naumov str., Kyiv 03164, Ukraine
2Institute of General & Inorganic Chemistry, Ukrainian National Academy of Sciences, 32/34 Palladin str., 03680 Kyiv, Ukraine
3National Technical University, 37 prosp. Peremogy, Kyiv 03056, Ukraine

Received 25 February 2005; Revised 10 July 2005; Accepted 28 August 2005

Copyright © 2006 Natalie Smirnova 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

Optically transparent, crack-free mesoporous titania and zirconia-doped titania thin film photocatalysts were fabricated by sol-gel technique, using nonionic amphiphilic block copolymer Pluronic P123 as template. The structural and optical properties of these films were characterized using SEM, low-angle XRD, and UV/Vis spectroscopy, hexane adsorption investigation. Band gap energy and the position of flatband potentials were estimated by photoelectrochemical measurements. Enhancing of photocatalytic activity of zirconia-doped films relative to pure TiO2 originates from an anodic shift of the valence band edge potential. Catalytic activity of mesoporous TiO2 and TiO2/ZrO2 (5–50% of ZrO2) films in the processes of CrVI to CrIII photoreduction and 2,4-dinitroaniline photooxidation correlates with crystalline size and growth with increasing of specific surface area of the samples.