关键词: 光催化性能, 罗丹明B, 无定形二氧化钛, 溴氧化铋, 电纺纳米纤维膜

Abstract:

To enhance the photocatalytic activity and recyclability of BiOBr, electrospun polyvinyl alcohol (PVA)/SiO₂ organic-inorganic hybrid nanofibers were employed as supports for loading of amorphous TiO₂ (A-TiO₂) doped BiOBr (designated as A-TB) by a solvothermal method, successfully constructing a series of A-TB@PVA/SiO₂ composite nanofibers photocatalysts. The performance of the photocatalysts toward rhodamine B (RhB) degradation was then explored. The results indicated that the introduction of A-TiO₂ could effectively inhibit the recombination of photogenerated carriers, thereby improving the photocatalytic activity. Among them, A-TB0.75@PVA/SiO₂ achieved a visible-light-driven photocatalytic degradation efficiency of 82.5% for RhB within 180min, and the photocatalytic rate was enhanced by one time compared to that of the undoped A-TiO₂ counterpart. Meanwhile, the immobilization of A-TB onto electrospun nanofibers significantly increased the exposure of active sites, leading to a 1.93 times promotion in photocatalytic rate compared to powdered A-TB. Furthermore, the photocatalytic activity only decreased by about 7% after 5 cycles, underscoring its excellent stability and reproducibility. This study provided an effective strategy for the construction of recyclable and efficient BiOBr-based photocatalysts.

Key words: photocatalytic performance, rhodamine B, amorphous TiO₂, BiOBr, electrospun nanofiber membrane