关键词: 镧掺杂, 磷酸铋, 光催化

Abstract: La3+-doped BiPO4 photocatalysts were fabricated via facile hydrothermal process.The morphologies，structures， light absorption properties，and surface chemical composition of the samples were characterized and analyzed by XRD，EDS， SEM，BET，UV-Vis，and XPS etc.，respectively.The photocatalytic activities were evaluated by the degradation of methylene blue as the targeted compound，and the doping mechanisms of lanthanum-doped for improving the BiPO4 photocatalyst were discussed.It was found that because of doping with lanthanum the growth of crystalline size was inhibited，the specific surface area was increased，the band gap was widened，the oxygen vacancy was produced，and the combination of photo-generated electrons and holes could be decreased.In addition，compared with the pure BiPO4，photocatalytic activity of the La3+-BiPO4 powder was enhanced obviously.The degradation efficiency of methylene blue in 90 min reached 95% under the UV light irradiation.The apparent reaction rate of 2% La3+-BiPO4 was 3.7 times higher than that of undoped BiPO4.

Key words: lanthanum-doping, bismuth phosphate, photocatalysis