Article (Scientific journals)
Sol-gel preparation of pure and doped TiO2 films for the photocatalytic oxidation of ethanol in air
Cimieri, Iolanda; Poelman, Hilde; Avci, Nursen et al.
2012In Journal of Sol-Gel Science and Technology, 63, p. 526-536
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Keywords :
TiO2 photocatalyst; doping effect; visible photocatalytic activity
Abstract :
[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.
Disciplines :
Chemical engineering
Chemistry
Materials science & engineering
Author, co-author :
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 - ULiège > Département de chimie appliquée > Département de chimie appliquée
Lambert, Stéphanie  ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Génie catalytique
Heinrichs, Benoît ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Nanomatériaux et interfaces
Poelman, Dirk;  Ghent University > Department of Solid State Sciences > LumiLab
Language :
English
Title :
Sol-gel preparation of pure and doped TiO2 films for the photocatalytic oxidation of ethanol in air
Publication date :
2012
Journal title :
Journal of Sol-Gel Science and Technology
ISSN :
0928-0707
eISSN :
1573-4846
Publisher :
Springer, Boston, United States - Massachusetts
Volume :
63
Pages :
526-536
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
FWO - Fonds Wetenschappelijk Onderzoek Vlaanderen [BE]
Available on ORBi :
since 08 June 2012

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