Photocatalytic activity of titanium dioxide produced by high-energy milling

Abstract

In this work, photocatalysts based on titanium dioxide were synthesized by high-energy ball milling of commercial titanium dioxide in the anatase modification. Using a complex of physicochemical methods, including XRD, low-temperature nitrogen adsorption, XPS and TEM, it was shown that the milling of commercial anatase leads to phase transformations and the formation of several phases of titanium dioxide, namely the high-pressure phase, the monoclinic phase of anatase and rutile, except for in addition, there is a change in the crystalline size and the value of the specific surface area grows from 8 to 31 m 2 /g. It was found that defects are introduced into the system during ball milling. The photocatalysts obtained by milling showed an activity comparable to the commercial standard TiO 2 Degussa P25 in the destruction of the methylene blue dye under the action of UV light, while the adsorption properties of the synthesized samples exceeded those of commercial P25. KEYWORDSTitanium dioxide, high-energy ball milling, photocatalytic oxidation ACKNOWLEDGEMENTS This work was supported by the Russian Science Foundation, project no. 21-73-20039. XPS and HRTEM investigations was performed using the facilities of the shared research center "National Center for the Investigation of Catalysts" at the Boreskov Institute of Catalysis. Authors thanks to I. D. Popov, A. A. Saraev, E. Yu. Gerasimov for DRS, XPS, and TEM experiments, respectively.

Planar perovskite solar cells with La2NiMnO6 buffer layer

“…The latter is due to both the degradation of the perovskite material itself and the instability of the TiO 2 layer when exposed to ultraviolet radiation. Long-term illumination causes desorption of oxygen molecules inside the TiO 2 material, which initiate the degradation of the perovskite layer [12][13][14]. In addition, FTO layer is characterized by relatively rough and non-uniform surface, which may lead to non-uniform deposition of cTiO 2 layer on FTO substrate.…”