Abstract
A layered perovskite-like oxides LaxSr2−xTi1−x/2Cux/2O4 (x = 0.2, 0.3, 0.5) with a K2NiF4-type structure were obtained. The introduction of copper into the titanium sublattice reduces the band gap. Copper in these materials serve as a photoactivity regulator and is presented in two oxidation states in accordance with optical, voltammetric and EPR data. LaxSr2−xTi1−x/2Cux/2O4 (x = 0.2) exhibits the greatest photoactivity in the oxidation of phenolic compounds and As(III) under the influence of UV and blue light; with increasing degree of substitution x, the photoactivity of LaxSr2−xTi1−x/2Cux/2O4 decreases. This is explained by the formation of a magnetic polaron, which is observed in LaxSr2−xTi1−x/2Cux/2O4 (x = 0.5) in the temperature range from 50 to 200 K and is proven by ESR method. The expansion of the spectral range of LaxSr2−xTi1−x/2Cux/2O4 to the visible region is explained by the formation of acceptor levels \(\left( {{\text{Cu}}^{2 + } + {\text{e}}^{ - } \to {\text{Cu}}^{ + } / {\text{Cu}}^{ + } + {\text{h}}^{ + } \to {\text{Cu}}^{2 + } } \right)\) in the band gap of Sr2TiO4, which increases the efficiency of separation of photogenerated electron–hole pairs. The presence of Cu (I) в LaxSr2−xTi1−x/2Cux/2O4 enhance photoactivity through the formation of active superoxygen radical on its surface (\({\text{Cu}}^{ + } {\text{ + O}}_{{{2}\left( {{\text{ad}}} \right)}} \to {\text{Cu}}^{{2 + }} +\cdot{{\text{O}}}_{{2}}^{ - }\)).
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Acknowledgements
This work was carried out in accordance with the state assignment and research plans of the Institute of Solid State Chemistry of the Ural Branch of the Russian Academy of Sciences (grant № AAA-A19-119031890025-9). T.P.G., R.M.E., I.V.Y and A.A.S. acknowledge the financial support from the government assignment for FRC Kazan Scientific Center of RAS. The UV-Vis-NIR spectra were recorded on equipment of the Center for Joint Use "Spectroscopy and Analysis of Organic Compounds" at the Postovsky Institute of Organic Synthesis, UB RAS.
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Chupakhina, T.I., Eremina, R.M., Gyrdasova, O.I. et al. Perovskite-like LaxSr2−xTi1−x/2Cux/2O4 (x = 0.2, 0.3, 0.5) oxides with the K2NiF4-type structure active in visible light range: new members of the photocatalyst family. J. Korean Ceram. Soc. (2024). https://doi.org/10.1007/s43207-024-00382-0
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DOI: https://doi.org/10.1007/s43207-024-00382-0