Low-Temperature Sol–Gel Synthesis and Photoactivity of Nanocrystalline TiO2 with the Anatase/Brookite Structure and an Amorphous Component
| Autor: | L. Yu. Buldakova, M. Yu. Yanchenko, A. S. Vorokh, A. O. Bokunyaeva, A. A. Yushkov, Elizaveta V. Shalaeva, Marina G. Pervova, Andrei N. Enyashin, N. S. Kozhevnikova, D. A. Zamyatin, Tatyana I. Gorbunova, E.S. Ulyanova, V. Yu. Kolosov |
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| Rok vydání: | 2019 |
| Předmět: |
Anatase
010405 organic chemistry Brookite chemistry.chemical_element General Chemistry 010402 general chemistry 01 natural sciences Catalysis Nanocrystalline material 0104 chemical sciences Computer Science Applications Amorphous solid chemistry.chemical_compound chemistry Chemical engineering Rutile Modeling and Simulation visual_art Titanium dioxide visual_art.visual_art_medium Photocatalysis Titanium |
| Zdroj: | Kinetics and Catalysis. 60:325-336 |
| ISSN: | 1608-3210 0023-1584 |
| DOI: | 10.1134/s002315841903008x |
| Popis: | 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°C. X-ray diffraction, transmission electron microscopy, and Raman spectroscopy are used to show that the size of anatase particles is about 6 nm, 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. |
| Databáze: | OpenAIRE |
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