In situ preparation of novel heterojunction BiOBr/BiVO4 photocatalysts with enhanced visible light photocatalytic activity

Heterojunction photocatalysts BiOBr/BiVO4 were in situ synthesized through acid etching coupled with a hydrothermal process, and the optimized BiOBr/BiVO4 ratio was tuned to explore their visible-light photocatalytic activity for MB degradation. Remarkably, BiOBr/BiVO4 composites exhibited higher visible-light photocatalytic ability compared with single BiVO4 and BiOBr alone. The charge-separation process was interpreted based on the energy band structure. The heterojunction formed between BiVO4 and BiOBr, that effectively promotes the separation of photo-induced electrons and holes, is responsible for the improved photocatalytic activity.