Reference : Sol-gel preparation of pure and doped TiO2 films for the photocatalytic oxidation of eth...
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
Engineering, computing & technology : Chemical engineering
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/124753
Sol-gel preparation of pure and doped TiO2 films for the photocatalytic oxidation of ethanol in air
English
Cimieri, Iolanda mailto [Ghent University > Department of Solid State Sciences > LumiLab > >]
Poelman, Hilde [Ghent University > Department of Chemical Engineering > > >]
Avci, Nursen [Ghent University > Department of Solid State Sciences > LumiLab > >]
Geens, Jérémy mailto [Université de Liège - ULg > Département de chimie appliquée > Département de chimie appliquée >]
Lambert, Stéphanie mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
Heinrichs, Benoît mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Nanomatériaux et interfaces >]
Poelman, Dirk mailto [Ghent University > Department of Solid State Sciences > LumiLab > >]
2012
Journal of Sol-Gel Science and Technology
Springer
63
526-536
Yes
International
0928-0707
1573-4846
Boston
MA
[en] TiO2 photocatalyst ; doping effect ; visible photocatalytic activity
[en] Stable sols of TiO2 were synthesized by a non-aqueous sol-gel process using titanium (IV) isopropoxide (TTIP) as precursor. The microstructure, optical and morphological properties of the films obtained by spin-coating from the sol, and annealed at different temperatures, were investigated using SEM, TEM, diffuse reflectance spectroscopy (DRS) and ellipsometry. The crystalline structure of the films was characterized by X-ray diffraction and their photocatalytic activity was evaluated for the oxidation of ethanol in air. The influence of the calcination temperature, pre-heat treatment and the number of layers was studied. Simultaneous thermo-gravimetric and differential thermal analysis (TG/DTA) measurements were carried out to ascertain the thermal decomposition behavior of the precursors.
In order to obtain a higher photoresponse in the visible region, a series of vanadium-, niobium- and tantalum-doped TiO2 catalysts was synthesized by the same sol-gel method. For V doping two different precursors, a vanadium alkoxide and V2O5, were used. The effect on the crystallization and photocatalytic activity of the doped TiO2 films was investigated. Furthermore, to identify the effective composition of the samples, they were characterized by X-ray photoelectron spectroscopy (XPS) and the surface area of the powders was measured by N2 adsorption. The 10wt.% doped catalysts exhibit high photocatalytic activity under visible light and among them the best performance was obtained for the sample containing Ta as dopant. The crystallite sizes are closely related to the photocatalytic activity.
Fonds Wetenschappelijk Onderzoek - FWO
http://hdl.handle.net/2268/124753
10.1007/s10971-012-2815-6

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