Title: Effect of Ag, Co and Cr deposit on the photocatalytic activity of titania-silica for the removal of 2-propanol in water

Authors: R.M. Mohamed, K. Mori, H. Yamashita

Addresses: Central Metallurgical R&D Institute, Nanostructured Materials Lab., Department of Advanced Materials, Helwan, 11421, Cairo, Egypt. ' Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suite, Osaka, 565-0871, Japan. ' Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suite, Osaka, 565-0871, Japan

Abstract: The influence of transition metals (Ag, Cr and Co) on the structural and photocatalytic properties of titania-silica prepared via both impregnation (imp) and photo-assisted deposition (PAD) methods has been investigated. The destruction of 2-propanol in the presence of UV-light was used to probe the effect of transition metals deposition on the activity of titania-silica. The PAD-Ag/TiO₂-SiO₂ was highly active, while, imp-Cr/TiO₂-SiO₂ showed a weakly tendency toward destruction of 2-propanol. By using a combination of various physicochemical techniques such as X-ray diffraction (XRD), diffuse reflectance UV-vis and transmission electron microscope (TEM) the products are characterised. XRD results revealed that titania anatase phase structure was remained after applying the PAD and imp methods. However, No peak from transition metal was observed, the data may imply that, the transition metals were well dispersed within the TiO₂-SiO₂ phase.

Keywords: TiO2-SiO2; transition metals; photo-assisted deposition; PAD; impregnation; imp; photocatalytic activity; cobalt; chromium; silver; titanium dioxide; silicon dioxide; photocatalysis; 2-propanol removal; titania; silica.

DOI: 10.1504/IJNP.2009.028789

International Journal of Nanoparticles, 2009 Vol.2 No.1/2/3/4/5/6, pp.512-521

Published online: 30 Sep 2009 *

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