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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/2046

Title: Aerosol-assisted production of mesoporous titania microspheres with enhanced photocatalytic activity: the basis of an improved process.
Authors: Araujo, PZ
Luca, V
Bozzano, PB
Bianchi, HL
Arturo Soler-Illia, GJDA
Blesa, MA
Keywords: Photocatalysis
Microspheres
Aerosols
Gallic Acid
Visible Radiation
Porosity
Issue Date: Jun-2010
Publisher: American Chemical Society
Citation: Araujo, P. Z., Luca, V., Bozzano, P. B., Bianchi, H. L., Soler-Illia, G., & Blesa, M. A. (2010). Aerosol-assisted production of mesoporous titania microspheres with enhanced photocatalytic activity: the basis of an improved process. ACS Applied Materials & Interfaces, 2(6), 1663-1673.
Abstract: An aerosol-based process was used to prepare mesoporous TiO2 microspheres (MTM) with an average diameter in the range of 0.5−1 μm. The structural characteristics and photocatalytic properties of the synthesized materials were determined. As-prepared MTM materials and those heated in air from 400 to 600°C exhibited mesoporous texture with a narrow size distribution and an inorganic framework that consisted of 4−13 nm anatase crystallites. Pore volumes for the MTM materials were in the range of 0.17−0.34 cm3 g−1. Microspheres heated to 400°C presented a locally ordered mesopore structure and possessed X-ray diffraction d spacings between 9.8 and 17.3 nm. Heating above 400°C resulted in a loss of the mesoscopic order, a decrease of the surface area, retention of the porosity, and an increase of the anatase nanoparticle size to 13 nm. The accessibility of the pore volume was measured by monitoring the uptake of gallic acid (GA) using Fourier transform IR. The MTM materials made excellent catalysts for the photodegradation of GA, with the performance being higher than that of an equivalent sample of Degussa P25. The present MTM materials are advantageous in terms of their ease of separation from the aqueous phase, and hence a novel photocatalytic process is proposed based on separate adsorption and photocatalytic decomposition steps with an improved and more rational use of both catalyst and sunlight. © 2010, American Chemical Society
URI: http://dx.doi.org/10.1021/am100188q
http://apo.ansto.gov.au/dspace/handle/10238/2046
ISSN: 1944-8244
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