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Magnetic Photocatalysts Based on Nanocrystalline Manganese-Doped Titanium Dioxide

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Abstract

Manganese-doped anatase with a nanosized morphology (as spherically shaped nanoparticles) has been synthesized under hydrothermal conditions. It has been shown that manganese is incorporated into the titanium dioxide structure to form substitutional solid solutions. At high dopant concentrations, part of the introduced manganese goes to the formation of α-MnO2. A significant increase in the optical activity in the visible range and a decrease in the bandgap width down to ~2.4 eV are observed for manganese-doped anatase because of the appearance of extrinsic (multivalent Mn ions) and intrinsic compensating (oxygen vacancies) defects. It has been found that manganese-doped samples are diluted magnetic semiconductors, and the magnetic characteristics increase with increasing manganese content. All manganese-containing samples demonstrate photocatalytic activity in the degradation reaction of indigo carmine when irradiated with visible light. The degree of dye degradation depends on the content of manganese in the samples and reaches >90%.

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ACKNOWLEDGMENTS

We are grateful to N.V. Polyakova for XRF analysis and N.S. Saenko for recording EPR spectra. X-ray diffraction experiments were carried out using equipment of the Shared Facility Center of the Far East Center of Structural Research and Analysis (Institute of Chemistry FEB RAS).

Funding

Synthesis and SEM, EDX, and XRF studies were carried out in the framework of theme no. 0205-2021-0002 of the state assignment of the Institute of Chemistry FEB RAS. UV-Vis experiments were performed with the financial support of the Russian Science Foundation (project no. 19-73-10017).

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Authors and Affiliations

  1. Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, 690022, Vladivostok, Russia

    V. V. Zheleznov, I. A. Tkachenko, A. M. Ziatdinov, D. P. Opra, M. S. Vasilyeva, D. A. Saritsky, E. V. Tarasov & V. G. Kuryavyi

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  1. V. V. Zheleznov
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  2. I. A. Tkachenko
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  3. A. M. Ziatdinov
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  4. D. P. Opra
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  5. M. S. Vasilyeva
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  6. D. A. Saritsky
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  7. E. V. Tarasov
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  8. V. G. Kuryavyi
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Correspondence to V. V. Zheleznov.

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Translated by G. Kirakosyan

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Zheleznov, V.V., Tkachenko, I.A., Ziatdinov, A.M. et al. Magnetic Photocatalysts Based on Nanocrystalline Manganese-Doped Titanium Dioxide. Russ. J. Inorg. Chem. 68, 95–103 (2023). https://doi.org/10.1134/S0036023622602045

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