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Photocatalytic O2 evolution with the visible-light-driven photocatalysts M3V2O8 (M = Mg, Zn)

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Photocatalytic O2 evolution from aqueous AgNO3 solution with M3V2O8(M = Mg, Zn) was carried out under visible light irradiation. The M3V2O8powder samples synthesized by a solid-state reaction method were characterized by X-ray diffraction and UV-Vis diffuse reflectance spectroscopy. M3V2O8had similar crystal structures and band gaps. However, the photocatalytic activity of O2evolution for Zn3V2O8was much higher than that for Mg3V2O8. It was suggested that the Zn-3d orbital hybridized with the O-2p orbital in constructing the valence band of Zn3V2O8, whereas there was no such hybridization involving in the valence band of Mg3V2O8. The different photocatalytic properties could be ascribed to their different electronic structures.


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