Abstract
Single-phase hollow bismuth ferrite microspheres ∼1 µm in diameter were synthesized by ultrasonic spray pyrolysis in a stream of air or argon. All the samples exhibited photocatalytic activity exceeding that of the standard TiO2 catalyst under UV irradiation. The samples synthesized in an argon stream exhibit catalytic activity under irradiation with a blue light. A comprehensive study showed that the appearance of the catalytic activity under the action of visible light was not associated with the powder particle morphology, oxygen defectiveness, and a change in the band gap width. An X-ray photoelectron spectroscopic study revealed decreased content of adsorbed oxygen on the surface of BiFeO3 synthesized in an argon stream. Possible mechanisms responsible for the appearance of the photocatalytic activity in the visible range are discussed.
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Acknowledgments
X-ray diffraction studies were performed at the X-ray Diffraction Analysis Center for Shared Use at the Institute of Solid-State Chemistry, Ural Branch, Russian Academy of Sciences. The UV, visible, and near-IR absorption spectra were recorded with a UV-2600 spectrometer at the Spectroscopy and Analysis of Organic Compounds Center for Shared Use at the Institute of Organic Synthesis, Ural Branch, Russian Academy of Sciences.
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Dmitriev, A.V., Vladimirova, E.V., Kandaurov, M.V. et al. Photocatalytic Properties of Hollow BiFeO3 Spheres. Russ J Appl Chem 92, 113–121 (2019). https://doi.org/10.1134/S10704272190100166
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DOI: https://doi.org/10.1134/S10704272190100166