Manganese-Doped Composites Based on Titanium Dioxide: Template Sol–Gel Synthesis, Structure, and Properties

作者：И. А. Ткаченко, Yu. V. Marchenko, M. S. Vasilyeva, Valery Kuryavy, A. V. Gerasimenko, N. V. Polyakova, В. В. Железнов · 发表于：Russian Journal of Inorganic Chemistry · 年份：2022 · DOI：10.1134/s0036023622090169 · 被引用次数：6 · 研究领域：TiO2 Photocatalysis and Solar Cells、Advanced Photocatalysis Techniques、Pigment Synthesis and Properties

Abstract Manganese-doped nanostructured composites based on TiO2 were obtained by the template sol–gel method. By a set of investigation techniques, it was established that manganese doping leads to the appearance of a rutile phase, which grows with increasing manganese content. It was found that during the template sol–gel synthesis of the TiO2/Mn composite, the doping element is not only incorporated into the titanium dioxide structure, but also forms separate phases on its surface. Study of the magnetic characteristics of the obtained composites revealed ferromagnetic ordering at room temperature, while lowering the temperature leads to an increase in the coercive force and appearance of the ferromagnet/antiferromagnet type exchange interaction. A magnetic transition at about 43 K, associated with the transfer of Mn3O4 nanoparticles to the ferromagnetic state, was detected in the composites. Undoped titanium dioxide showed a high photocatalytic activity in the visible spectral range, providing 98% degree of indigo carmine degradation. Manganese doping of TiO2 microtubes inhibited the photocatalytic activity.