Abstract
The photocatalytic ability of Rb0.9Nb1.625Mo0.375O5.62 UV-photocatalyst has been improved by electron structure modifications. The Rb0.75Cu0.15Nb1.625Mo0.375O5.6 and Rb0.8Mn0.1Nb1.625Mo0.375O5.7 modified compounds and Rb0.9Nb1.625Mo0.375O5.62/SnO2 heterostructure photocatalyst have been obtained under hydrothermal conditions. The crystal structure and elemental composition have been confirmed by X-ray diffraction analysis and X-ray microanalysis. The electron structure of the obtained samples has been investigated in comparison to initial one by diffuse reflection spectroscopy. All prepared samples possess the absorption in visible light range; however significant photocatalytic activity shows only Rb0.9Nb1.625Mo0.375O5.62/SnO2 heterostructure. The kinetic study of methylene blue photooxidation for Rb0.9Nb1.625Mo0.375O5.62/SnO2 at neutral pH have been investigated. It has been observed that the main oxidative species for dye oxidation are holes, hydroxyl radicals and superoxide radicals. The products of MB degradation have been determined by HPLC-MS method, and possible pathway of oxidation has been proposed.
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