Facile Synthesis of Nano-Flower β-Bi 2 O 3 /TiO 2 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-Bi 2 O 3 /TiO 2 composites were prepared via a facile solvothermal method, and the photocatalytic performances of β-Bi 2 O 3 /TiO 2 composites with different Bi/Ti molar ratios were studied. The nano-flower Bi 2 O 3 /TiO 2 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 Bi 2 O 3 /TiO 2 composites, which increases the separation efficiency of the generated carriers and improves photocatalytic properties. The photoactivity of the Bi 2 O 3 /TiO 2 has no evident changes after the fifth recovery, indicating that the Bi 2 O 3 /TiO 2 composite has distinguished stability.