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Nanoparticle route for the preparation in aqueous medium of mesoporous TiO2 with controlled porosity and crystalline framework

Bleta, Rudina and Alphonse, Pierre and Lorenzato, Lise Nanoparticle route for the preparation in aqueous medium of mesoporous TiO2 with controlled porosity and crystalline framework. (2010) Journal of Physical Chemistry C, vol. 114 (n° 5). pp. 2039-2048. ISSN 1932-7447

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Official URL: http://dx.doi.org/10.1021/jp909646h

Abstract

Mesoporous TiO2 with tunable pore size and mono-, bi-, and tricrystalline frameworks was prepared from titania nanoparticles synthesized by a sol-gel method. The synthesis was performed by using an amphiphilic triblock copolymer, Pluronic F127, as a structure-directing agent and titanium isopropoxide as a precursor. The structure-directing agent was added in a presynthesized colloidal suspension composed of bicrystalline titania nanoparticles dispersed in an aqueous medium. By varying the ratio between the number of ethoxy units and the number of titanium atoms (EO/Ti), mesoporous TiO2 materials with controlled pore size were synthesized. Materials were characterized by TG/DTA, XRD, SEM, TEM, and N2 adsorption-desorption analysis. In the absence of copolymer, the porosity was low, indicating efficiently packed TiO2 nanoparticles. As the EO/Ti ratio was increased, the average pore size and the specific surface area became larger, whereas the crystallite size of anatase and brookite became smaller. The addition of copolymer induced the enrichment of the brookite polymorph, prevented particle growth, and delayed the formation of rutile. Bimodal (mesoporous-macroporous) N-doped titania with a pure anatase framework was obtained by using diethanolamine (DEA) as the source of nitrogen.

Item Type:Article
Additional Information:Thanks to American Chemical Society editor. The definitive version is available at http://portal.acs.org/ The original PDF of the article can be found at Journal of Physical Chemistry C website : http://pubs.acs.org/doi/abs/10.1021/jp909646h
Audience (journal):International peer-reviewed journal
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Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Nihad Lahdifi

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