Facile Synthesis of BiOBr/Bi ₂ Sn ₂ O ₇ Heterojunction Photocatalysts with Improved Photocatalytic Activities

Abstract

BiOBr/Bi 2 Sn 2 O 7 heterojunction photocatalysts were successfully synthesized by treating hydrothermal as‐prepared Bi 2 Sn 2 O 7 nanoparticles with hydrobromic acid (HBr). Partial Bi 2 Sn 2 O 7 nanoparticles reacted with HBr to form the sheet‐like BiOBr, and Bi 2 Sn 2 O 7 nanoparticles distributed evenly on BiOBr sheets. BiOBr/Bi 2 Sn 2 O 7 photocatalysts treated with different concentrations of HBr solution were successfully obtained, and their structures, morphologies, optical, and visible light photocatalytic properties were characterized by XRD, DRS, PL, SEM, and TEM. The experimental results showed that the BiOBr/Bi 2 Sn 2 O 7 photocatalysts showed improved photocatalytic activity under visible light irradiation than pure Bi 2 Sn 2 O 7 . The sample treated with 0.08 mol/L HBr solution shows the best visible light photodegradation performance of rhodamine B. In addition, the active species and photocatalytic mechanism were discussed in detail.