Physical-chemical and photocatalytic properties of V-Mg oxide compositions synthesized by different methods
New approaches to vanadium-magnesium oxide catalysts synthesis have been proposed: using of mechanochemical (MChT), hydrothermal (HTT), and microwave (MWT) treatments; and V <sub>2</sub>O <sub>5</sub> gel as initial reagent. XRD, DTA-TG, FTIR and UV-Vis spectroscopy, adsorption of nitrogen have been used for study of precursors and catalysts structure. Magnesium methavanadate MgV <sub>2</sub>O <sub>6</sub>·2H <sub>2</sub>O with high specific surface area transformed into orthovanadate Mg3V2O8 – pyrovanadate Mg <sub>2</sub>V <sub>2</sub>O <sub>7</sub> mixture is formed as a result of MWT and HTT. The sample prepared from microwave precursor possesses the highest specific surface area, developed porous structure, and maximum photocatalytic activity under visible light on safranin T degradation in aqueous medium.