New Generation Photocatalysts: How Tungsten Influences the Nanostructure and Photocatalytic Activity of TiO(2) in the UV and Visible Regions

0371850 - ÚACH 2012 RIV US eng J - Journal Article
Štengl, Václav - Velická, Jana - Maříková, Monika - Matys Grygar, Tomáš
New Generation Photocatalysts: How Tungsten Influences the Nanostructure and Photocatalytic Activity of TiO(2) in the UV and Visible Regions.
ACS Applied Materials and Interfaces. Roč. 3, č. 10 (2011), s. 4014-4023. ISSN 1944-8244. E-ISSN 1944-8252
R&D Projects: GA ČR GA203/08/0334
Institutional research plan: CEZ:AV0Z40320502
Keywords : titania * peroxo complexes * tungstate * thermal hydrolysis * photocatalysis
Subject RIV: CA - Inorganic Chemistry
Impact factor: 4.525, year: 2011

Tungsten-doped anatase was prepared by a thermal hydrolysis of aqueous solutions of peroxo complexes of titanium and tungsten. The synthesized samples included X-ray diffraction, high-resolution transmission electron microscopy, selected area electron diffraction, Raman spectroscopy, specific surface area, and porosity determination. W doping resulted in a decrease of the unit-cell volume of anatase at lower W contents and an increase at higher W contents. The position of the most intense Raman band of the E(g) mode (near 147 cm(-1)) also has a local minimum at medium-doped titania (1.1-3.6% Win titania). W doping increases the temperature of anatase-to-rutile transformation by about 100 degrees C compared with nondoped anatase. The photocatalytic activity of doped titania samples was determined by decomposition of Orange II dye during irradiation at 365 and 400 nm. Specimens with moderate W doping (1.0-3.3% W) perform best: they enhance the corresponding reaction rates 10 times at 365 nm and 5 times at 400 nm, respectively, compared with pure titania obtained under the same set of synthesis conditions.
Permanent Link: http://hdl.handle.net/11104/0205272