Photocatalytic Properties of the α-Bi2O3/Bi Composition in the Visible Region Depending on Metallic Bismuth Concentration and Degree of Imperfection of the Bismuth Oxide Crystal Lattice.

Autor: Kirichenko, E. A., Kaminsky, O. I., Zaytsev, A. V., Makarevich, K. S., Pyachin, S. A.
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Zdroj: Optics & Spectroscopy; Mar2020, Vol. 128 Issue 3, p315-322, 8p
Abstrakt: The photocatalytic activity of heterostructural α-Bi2O3/Bi compositions obtained by low-temperature pyrolysis of bismuth complexes with sorbite has been investigated. The efficiency of catalysts has been estimated based on the decomposition rate of methylene blue under illumination by visible light. The obtained catalysts are characterized by different contents of metallic Bi and different degrees of imperfection of the α-Bi2O3 lattice, which was obtained by changing the amount of sorbite in the composition of the precursor organomineral bismuth complex and varying the synthesis temperature. It is established that isothermal annealing of the α-Bi2O3/Bi compositions in air in the range of 400–600°C leads to relaxation of defects and an increase in the α-Bi2O3 lattice volume. An increase in the annealing temperature to 550°C is accompanied by a rise in the α-Bi2O3/Bi catalytic activity. However, the heterostructure degrades at higher temperatures as a result of metallic bismuth oxidation, while the catalytic activity decreases. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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