期刊
KINETICS AND CATALYSIS
卷 60, 期 3, 页码 325-336出版社
PLEIADES PUBLISHING INC
DOI: 10.1134/S002315841903008X
关键词
titanium dioxide; sol-gel method; polymorphism; nanostructures; photocatalytic properties; quantum chemical calculations
资金
- Russian Science Foundation [17-79-20165]
- Institute of Organic Synthesis, Ural Branch, Russian Academy of Sciences [075-00578-19-00]
- Russian Science Foundation [17-79-20165] Funding Source: Russian Science Foundation
Nanodispersed TiO2 consisting of anatase and brookite phases in a ratio of 3 : 1 is obtained by the sol-gel method from titanium(IV) butoxide at a temperature below 100 degrees C. X-ray diffraction, transmission electron microscopy, and Raman spectroscopy are used to show that the size of anatase particles is about 6nm, and brookite particles consist of a crystal core, 4 nm in diameter, surrounded by an amorphous shell. Compared with the commercial Degussa P25 photocatalyst, which consists of the anatase and rutile phases in the same 3 : 1 ratio, the resulting TiO2 exhibits an increased photoactivity in hydroquinone oxidation. Quantum chemical modeling of anatase and brookite surfaces as well as their interface does not reveal the specific features of their electronic structure. This fact is indicative of the amorphous phase as an active participant in the transfer of charge carriers in the photocatalytic process.
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