Brookite versus anatase TiO2 photocatalysts: Phase transformations and photocatalytic activities

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Kandiel, T.A.; Robben, L.; Alkaim, A.; Bahnemann, D.: Brookite versus anatase TiO2 photocatalysts: Phase transformations and photocatalytic activities. In: Photochemical and Photobiological Sciences 12 (2013), Nr. 4, S. 602-609. DOI: https://doi.org/10.1039/c2pp25217a

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Sum total of downloads: 143




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Abstract: 
Titanium dioxide nanoparticles consisting of pure anatase, anatase-rich, brookite-rich, and pure brookite modifications were synthesized and characterized by X-ray diffraction, field emission-scanning electron microscopy and nitrogen adsorption. The phase transformations among the three modifications of TiO2 (anatase, brookite, and rutile) and the photocatalytic activities of these nanoparticles were investigated by heat treatment over the temperature range from 400 to 800 °C and by the photooxidation of methanol, respectively. Direct transformation of anatase and brookite to rutile was observed, while in the case of the anatase–brookite mixture, anatase transforms firstly to brookite and then to rutile. The photocatalytic activity measurements indicate that brookite nanoparticles exhibit higher photocatalytic activities than anatase, and a comparable activity to that of the anatase-rich nanoparticles. The phase transformations and photocatalytic results are discussed regarding their dependence on crystallite size, surface area, and phase composition.
License of this version: Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
Document Type: article
Publishing status: publishedVersion
Issue Date: 2013
Appears in Collections:Naturwissenschaftliche Fakultät

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pos. country downloads
total perc.
1 image of flag of Germany Germany 79 55.24%
2 image of flag of United States United States 13 9.09%
3 image of flag of Iraq Iraq 10 6.99%
4 image of flag of Malaysia Malaysia 6 4.20%
5 image of flag of China China 4 2.80%
6 image of flag of Russian Federation Russian Federation 3 2.10%
7 image of flag of Japan Japan 3 2.10%
8 image of flag of Iran, Islamic Republic of Iran, Islamic Republic of 2 1.40%
9 image of flag of Europe Europe 2 1.40%
10 image of flag of Brazil Brazil 2 1.40%
    other countries 19 13.29%

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