Facile Synthesis of Nano-Flower β-Bi₂O₃/TiO₂ Heterojunction as Photocatalyst for Degradation RhB

Photocatalysis is a hopeful technology to solve various environmental problems, but it is still a technical task to produce large-scale photocatalysts in a simple and sustainable way. Here, nano-flower β-Bi₂O₃/TiO₂ composites were prepared via a facile solvothermal method, and the photocatalytic performances of β-Bi₂O₃/TiO₂ composites with different Bi/Ti molar ratios were studied. The nano-flower Bi₂O₃/TiO₂ composites were studied by SEM, XRD, XPS, BET, and PL. The PL result proved that the construction of staggered heterojunction enhanced the separation efficiency of carriers. The degradation RhB was applied to study the photocatalytic performances of prepared materials. The results showed that the degradation efficiency of RhB increased from 61.2% to 99.6% when the molar ratio of Bi/Ti was 2.1%. It is a mesoporous approach to enhance photocatalytic properties by forming heterojunction in Bi₂O₃/TiO₂ composites, which increases the separation efficiency of the generated carriers and improves photocatalytic properties. The photoactivity of the Bi₂O₃/TiO₂ has no evident changes after the fifth recovery, indicating that the Bi₂O₃/TiO₂ composite has distinguished stability.