Reference : Aqueous N-Doped TiO2 Catalysts for Visible Light Photocatalytic Applications
Scientific congresses and symposiums : Poster
Engineering, computing & technology : Chemical engineering
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/2268/229496
Aqueous N-Doped TiO2 Catalysts for Visible Light Photocatalytic Applications
English
Mahy, Julien mailto [Université de Liège - ULiège > Department of Chemical Engineering > Department of Chemical Engineering >]
Cerfontaine, Vincent []
Poelman, Dirk []
Devred, François []
Gaigneaux, Eric []
Heinrichs, Benoît mailto [Université de Liège - ULiège > Department of Chemical Engineering > Génie chimique - Nanomatériaux et interfaces >]
Lambert, Stéphanie mailto [Université de Liège - ULiège > Department of Chemical Engineering > Department of Chemical Engineering >]
Nov-2018
Yes
No
International
Matériaux 2018
du 19 au 23 novembre 2018
Strasbourg
France
[en] aqueous sol-gel process ; multiple crystalline phase catalyst ; N-doped TiO2 ; photocatalysis ; p-nitrophenol degradation
[en] In this work, TiO2 prepared with an aqueous sol-gel synthesis by peptization process is doped with nitrogen precursor to extend its activity towards the visible region. Three N-precursors are used: urea, ethylenediamine and triethylamine. Different molar N/Ti ratios are tested and the synthesis is adapted for each dopant. For urea- and trimethylamine-doped samples, anatase-brookite TiO2 nanoparticles of 6–8 nm are formed, with a specific surface area between 200 and 275 m2 g−1. In ethylenediamine-doped samples, the formation of rutile phase is observed, and TiO2 nanoparticles of 6–8 nm with a specific surface area between 185 and 240 m2 g−1 are
obtained. X-ray photoelectron spectroscopy (XPS) and diffuse reflectance measurements show the incorporation of nitrogen in TiO2 materials through Ti–O–N bonds allowing light absorption in the visible region. Photocatalytic tests on the remediation of water polluted with p-nitrophenol show a marked improvement for all doped catalysts under visible light. The optimum doping, taking into account cost, activity and ease of synthesis, is up-scaled to a volume of 5 L and compared to commercial Degussa P25 material. This up-scaled sample shows similar properties compared to the lab-scale sample, i.e., a photoactivity 4 times higher than commercial P25.
http://hdl.handle.net/2268/229496

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