Abstract
BaCrO 4 and SrCrO 4 photocatalyst powders were prepared by the solid state reaction method. They were characterized by powder X-ray diffraction, UV–Vis diffuse reflection spectroscopy and photocatalytic activity measurements in case of sacrificial reagents CH 3OH and AgNO 3 under UV and visible light irradiation ( λ>420 nm), respectively. The band gaps of BaCrO 4 and SrCrO 4 were determined as 2.63 and 2.44 eV. Due to the decrease of the ionic radius of the cation, the photocatalyst SrCrO 4 showed much lower photocatalytic activity than BaCrO 4 in evolving H 2 from CH 3OH/H 2O solution. The difference in their photocatalytic activity is ascribed to the special electronic structures of BaCrO 4 and SrCrO 4.
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