Low-Temperature Sol–Gel Synthesis and Photoactivity of Nanocrystalline TiO 2  with the Anatase/Brookite Structure and an Amorphous Component

N. S. Kozhevnikova; E. S. Ul’yanova; E. V. Shalaeva; D. A. Zamyatin; A. O. Bokunyaeva; A. A. Yushkov; V. Yu. Kolosov; L. Yu. Buldakova; M. Yu. Yanchenko; T. I. Gorbunova; M. G. Pervova; A. N. Enyashin; A. S. Vorokh

doi:10.1134/S002315841903008X

Low-Temperature Sol–Gel Synthesis and Photoactivity of Nanocrystalline TiO₂ with the Anatase/Brookite Structure and an Amorphous Component

Authors: Kozhevnikova N.S.¹, Ul’yanova E.S.¹, Shalaeva E.V.¹, Zamyatin D.A.²^,3, Bokunyaeva A.O.², Yushkov A.A.², Kolosov V.Y.², Buldakova L.Y.¹, Yanchenko M.Y.¹, Gorbunova T.I.⁴, Pervova M.G.⁴, Enyashin A.N.¹, Vorokh A.S.¹
Affiliations:
1. Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences
2. Ural Federal University Named after the First President of Russia B. N. Yeltsin
3. Zavaritskii Institute of Geology and Geochemistry, Ural Branch, Russian Academy of Sciences
4. Postovskii Institute of Organic Synthesis, Ural Branch, Russian Academy of Sciences
Issue: Vol 60, No 3 (2019)
Pages: 325-336
Section: Article
URL: https://journals.rcsi.science/0023-1584/article/view/164248
DOI: https://doi.org/10.1134/S002315841903008X
ID: 164248

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Abstract

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.

Keywords

titanium dioxide, sol–gel method, polymorphism, nanostructures, photocatalytic properties, quantum chemical calculations

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Low-Temperature Sol–Gel Synthesis and Photoactivity of Nanocrystalline TiO2 with the Anatase/Brookite Structure and an Amorphous Component

Full Text

Abstract

Keywords

About the authors

Supplementary files

Low-Temperature Sol–Gel Synthesis and Photoactivity of Nanocrystalline TiO₂ with the Anatase/Brookite Structure and an Amorphous Component