Issue 19, 2012
From the journal:

Journal of Materials Chemistry

Preparation of well-defined titania–silica spherical particles†

Kota Shiba,a   Soh Satoa  and  Makoto Ogawa*ab  

* Corresponding authors

a Graduate School of Creative Science and Engineering, Waseda University, 1-6-1 Nishiwaseda, Shinjuku-ku, Tokyo, Japan

b Department of Earth Sciences, Waseda University, 1-6-1 Nishiwaseda, Shinjuku-ku, Tokyo, Japan
E-mail: makoto@waseda.jp
Fax: +81-3-3207-4950
Tel: +81-3-5286-1511

Abstract

Well-defined 200 nm size titania–silica (Si/Ti atomic ratio of 0.19–1.5) spherical particles containing octadecylamine (ODA) were prepared by the hydrolysis and co-condensation of titanium tetraisopropoxide and tetraethoxysilane in the presence of ODA. ODA was extracted from the spherical particles using acidic ethanol to obtain nanoporous particles. The nanoporous titania–silica particles were calcined at 800 °C for 1 h to obtain nanoporous titania–silica particles composed of anatase crystallites and amorphous silica. Depending on the Si/Ti ratio, the size of anatase crystallites varied: 10 nm for the titania–silica particles at the Si/Ti ratio of 0.19 and 2 nm for those at the Si/Ti ratio of 1.5. The efficiency of photocatalytic decomposition of methylene blue was remarkably suppressed when the titania–silica particles at the Si/Ti ratio of 1.5 were used, though the bandgap absorption was possible at the same wavelength region for all the products.

Graphical abstract: Preparation of well-defined titania–silica spherical particles

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Article information

DOI
https://doi.org/10.1039/C2JM30502J
Article type
Paper
Submitted
26 Jan 2012
Accepted
11 Mar 2012
First published
13 Apr 2012

J. Mater. Chem., 2012,22, 9963-9969

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Preparation of well-defined titania–silica spherical particles

K. Shiba, S. Sato and M. Ogawa, J. Mater. Chem., 2012, 22, 9963 DOI: 10.1039/C2JM30502J

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