Nanoparticle/Microsphere TiO2/Bi2WO6Z-scheme Heterojunction with Excellent Visible-light Photocatalytic Performance

Flower-like BiOBr/Bi 2 WO 6 Z-scheme heterojunction was prepared by a two-step solvothermal method. BiOBr microspheres were firstly synthesized through solvothermal method. Then the out part of the BiOBr microspheres was designed to react with Na 2 WO 4 forming Bi 2 WO 6 nanosheets through ion exchange process. The BiOBr/Bi 2 WO 6 heterojunction has a larger BET surface area, smaller energy band gap, faster transfer of charge carriers and a much better visible-light photocatalytic performance than that of BiOBr and Bi 2 WO 6 . It also has a better cycling stability than that of the BiOBr. Possible photocatalytic mechanism of the BiOBr/Bi 2 WO 6 heterojunction is proposed.