Reference : Porphyrin-based hybrid silica-titania as a visible-light photocatalyst
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
Engineering, computing & technology : Chemical engineering
http://hdl.handle.net/2268/230673
Porphyrin-based hybrid silica-titania as a visible-light photocatalyst
English
Mahy, Julien mailto [Université de Liège - ULiège > Department of Chemical Engineering > Department of Chemical Engineering >]
Pàez Martinez, Carlos mailto [Université de Liège - ULiège > Department of Chemical Engineering > Génie chimique - Nanomatériaux et interfaces >]
Carcel, Carole []
Bied, Catherine []
Tatton, Andrew []
Damblon, Christian mailto [Université de Liège - ULiège > Département de chimie (sciences) > Chimie biologique structurale >]
Heinrichs, Benoît mailto [Université de Liège - ULiège > Department of Chemical Engineering > Génie chimique - Nanomatériaux et interfaces >]
Wong Chi Man, Michel []
Lambert, Stéphanie mailto [Université de Liège - ULiège > Department of Chemical Engineering > Department of Chemical Engineering >]
Mar-2019
Journal of Photochemistry and Photobiology A: Chemistry
Elsevier
373
66-76
Yes (verified by ORBi)
International
1010-6030
Netherlands
[en] Sol-Gel process ; photocatalysis ; bridged silsesquioxanes ; p-nitrophenol degradation ; hybrid silica-titania
[en] A silylated porphyrin derivative is co-hydrolyzed with Ti(OiPr)4 to produce a hybrid TiO2 photocatalyst, and three different ratios between porphyrin and TiO2 are made. In this way, the porphyrin fragments are held in the resulting matrix through strong Si-O-Ti covalent bonds to limit porphyrin leaching. Thanks to its photoactive character the porphyrin fragment can act as an actuator for the TiO2 to degrade organic pollutants using light from ultra-violet to the visible range. The photocatalysts are synthesized using an easy aqueous route allowing “green conditions” for synthesis. For comparative purposes, the corresponding pure TiO2 and a grafted catalyst are also synthesized and studied. For all samples, a mixture of anatase/brookite TiO2 is obtained, resulting in crystalline materials with low temperature synthesis. The three porphyrin-doped samples prepared in water prove to be efficient photocatalysts for the degradation of p-nitrophenol (PNP) under visible light, and an improvement in photoactivity is observed when the amount of porphyrin increases. The photocatalyst activity is very stable over time as the PNP degradation remains nearly constant after 264 h of testing, showing no leaching of porphyrin. In recycling tests, the grafted sample presents bond breaking between POR-Si and TiO2 and a decrease in photoactivity towards pure TiO2 sample activity. A comparison with the commercial Evonik P25 catalyst shows that the porphyrin-doped TiO2 is nearly 6 times more photoactive under visible light for PNP degradation.
http://hdl.handle.net/2268/230673
10.1016/j.jphotochem.2019.01.001

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