Photoelectrochemical characterization and photocatalytic properties of mesoporous TiO2/ZrO2 films
2006
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.
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