|Reference : Sol-gel preparation of pure and doped TiO2 films for the photocatalytic oxidation of ...|
|Scientific journals : Article|
|Engineering, computing & technology : Materials science & engineering|
Engineering, computing & technology : Chemical engineering
Physical, chemical, mathematical & earth Sciences : Chemistry
|Sol-gel preparation of pure and doped TiO2 films for the photocatalytic oxidation of ethanol in air|
|Cimieri, Iolanda [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 [Université de Liège - ULg > Département de chimie appliquée > Département de chimie appliquée >]|
|Lambert, Stéphanie [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]|
|Heinrichs, Benoît [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Nanomatériaux et interfaces >]|
|Poelman, Dirk [Ghent University > Department of Solid State Sciences > LumiLab > >]|
|Journal of Sol-Gel Science and Technology|
|[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|
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