Magnetic Photocatalysts Based on Nanocrystalline Manganese-Doped Titanium Dioxide

V. V. Zheleznov; Железнов В. В.; I. A. Tkachenko; Ткаченко И. А.; A. M. Ziatdinov; Зиатдинов А. М.; D. P. Opra; Опра Д. П.; M. S. Vasilyeva; Васильева М. С.; D. A. Saritsky; Сарицкий Д. А.; E. V. Tarasov; Тарасов Е. В.; V. G. Kuryavyi; Курявый В. Г.

doi:10.31857/S0044457X22100518

Magnetic Photocatalysts Based on Nanocrystalline Manganese-Doped Titanium Dioxide

Authors: Zheleznov V.V.¹, Tkachenko I.A.¹, Ziatdinov A.M.¹, Opra D.P.¹, Vasilyeva M.S.¹, Saritsky D.A.¹, Tarasov E.V.¹, Kuryavyi V.G.¹
Affiliations:
1. Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences
Issue: Vol 68, No 1 (2023)
Pages: 105-114
Section: НЕОРГАНИЧЕСКИЕ МАТЕРИАЛЫ И НАНОМАТЕРИАЛЫ
URL: https://journals.rcsi.science/0044-457X/article/view/136312
DOI: https://doi.org/10.31857/S0044457X22100518
EDN: https://elibrary.ru/GULEEP
ID: 136312

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Abstract
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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%.

Keywords

anatase, doping, nanoparticles, band gap, magnetic properties, photocatalytic activity

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