Photocatalytic TiO 2 Macroscopic Fiber Obtained through Integrative Chemistry
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Photocatalytic TiO2 Macroscopic Fiber Obtained through Integrative Chemistry Natacha Kinadjian,1,4 Mickael Le Bechec,2 Thierry Pigot,2 Fabien Dufour,3 Olivier Durupthy,3 Ahmed Bentaleb,1 Eric Prouzet,4 Sylvie Lacombe 2 and Rénal Backov1 1
Université de Bordeaux, Centre de Recherche Paul Pascal, office 115, UPR 8641-CNRS, 115 Avenue Albert Schweitzer, 33600 Pessac, France IPREM- Institut des Sciences Analytiques et de Physicochimie pour l’Environnement et les Matériaux, Université de Pau et des Pays de l’Adour, Hélioparc-2 Av. du Président Angot, F64053 Pau Cedex 09, France 3 Chimie de la Matière Condensée-UMR 7574 CNRS-Université Pierre et Marie CURIE, Collège de France, Bâtiment C, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France 4 Chemistry, ChemEng & Waterloo Institute of Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo (ON) N2L 3G1, Canada 2
ABSTRACT Photocatalytic properties of titanium oxide depend on the material size and shape, which can favour a higher interaction between reactants and catalyst. Most of the studies reported until now, show that reducing size down to the nanoscale increases the photocatalytic efficiency. We demonstrate that a multiscale shape design, integrating surface roughness, particle shape, and material 1D processing and orientation, can favour photocatalytic properties in the solid-gas regime, especially mineralization (conversion into CO2), when the material hierarchical 1D orientation is combined with unidirectional gas flow. Several materials with hierarchical structure were prepared and characterized. They have been tested for the photocatalytic mineralization of gaseous acetone, and compared with commercial catalysts. Our study reveals that a suitable combination of multiscale design can favour high mineralization. INTRODUCTION Titanium dioxide (TiO2) is a widely used photocatalyst. Nanostructured TiO2 exhibits superior photocatalytic activity compared to conventional bulk materials because of its high surface area over mass ratio [1]. TiO2 photocatalytic ability was enhanced by preparing various morphologies of nanostructured TiO2 [2,3]. Number of recent works especially reported the fabrication of one-dimensional (1D) TiO2 photocatalyst [4]. The large surface-to-volume ratio, the enhanced adsorption of various reactants, and the favorable morphology for enhancing a longer reactant-catalyst contact, are expected to improve, overall, the properties of these materials [5]. Electrospinning offers several advantages to create fibers (1D structure) [6]. However, these fibers are randomly dispersed during the synthesis step, resulting in a direct loss of unidirectionality at the macroscopic scale. It is expected that enhanced photocatalytic performance could result from synergy between the 1D hierarchical catalyst structure, and optimized unidirectional gas flux in solid-gas photocatalytic experiments. Design of such a hierarchical anisotropy can be addressed through an Integrative Chemistry pathway, which allows for multiscale material processin
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