Reference : Optimized deposition of TiO2 thin films produced by a non-aqueous sol-gel method and qua...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
Engineering, computing & technology : Chemical engineering
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/2268/118833
Optimized deposition of TiO2 thin films produced by a non-aqueous sol-gel method and quantification of their photocatalytic activity
English
Malengreaux, Charline mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Nanomatériaux et interfaces >]
Timmermans, Adrien mailto [ > > ]
Pirard, Sophie mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
Lambert, Stéphanie mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
Pirard, Jean-Paul mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
Poelman, Dirk mailto [Universiteit Gent - Ugent > > > >]
Heinrichs, Benoît mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Nanomatériaux et interfaces >]
2012
Chemical Engineering Journal
Elsevier Science
195-196
347-358
Yes (verified by ORBi)
International
1385-8947
1873-3212
Lausanne
Switzerland
[en] TiO2 ; thin film ; photocatalysis ; sol-gel ; dip-coating ; kinetics
[en] TiO2 thin films have been produced by a dip-coating process using a non-aqueous sol-gel method. This study investigated the influence of the operating variables such as nature of the substrate, sol concentration, withdrawing speed of the dip-coater and number of layers on the physico-chemical properties of the films using XRD, GIXRD, UV-Vis spectroscopy, profilometry, spectroscopic ellipsometry and SEM. Photocatalytic activity of the films was evaluated by following the degradation of methylene blue under artificial UV light at 25°C. The performances of the catalysts were compared through the reaction rate constants determined using an apparent first-order kinetic model adjusted on the experimental data. This study showed that the photocatalytic activity and the reaction rate constant depend on the film thickness through the synthesis and dipping variable, with an optimum thickness of 80 nm being observed. An optimized transparent film exhibiting a high adhesion, a well crystallized TiO2-anatase phase, a good photocatalytic activity and a reaction rate constant k equal to 0.126 h-1 was obtained using a simple process. The specific photocatalytic activity of this film was higher to the one measured for TiO2 powders in previous works.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Interuniversity Attraction Pole (IAP-P6/17) ; Ministère de la Région Wallonne ; Fonds de la Recherche Fondamentale Collective - FRFC ; Fonds Wetenschappelijk Onderzoek - FWO
http://hdl.handle.net/2268/118833
10.1016/j.cej.2012.04.076

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