Relationship between crystalline phases and photocatalytic activities of BiVO4

Abstract Visible-light-induced BiVO 4 microspheres with different crystalline phases have been successfully synthesized via simple thermal treatment methods. The photocatalytic activities of the samples were evaluated by the degradation of methylene blue (MB) under visible-light irradiation (420 nm  4 sample prepared at 400 °C, which was composed of mixed crystalline phases (tetragonal and monoclinic BiVO 4 ), exhibited the best activity. Through the detection of the degradation mechanism, it was found that the mixed phases availed the transfer of electrons and led to the generation of more kinds and amount of active species in the degradation process. The active species enhanced the photocatalytic activity. These results would be useful to develop highly efficient photocatalysts and helpful to reveal the degradation mechanism clearly.