Hongyu Luo,Ming Yan,Yilin Wu,Xinyu Lin,Yongsheng Yan
Porous TiO 2 nanorods were synthesized by H 2 SO 4 etching method, combined with the synthesis technology of BiOBr-TiO 2 heterojunction and NCQDs to synthesis the ternary NCQDs-BiOBr-TiO 2 photocatalyst. The micromorphology and structural composition of different powder catalysts and photocatalytic composite membranes were studied by means of various characterization methods. The UV–vis DRS results indicated that the formation of BiOBr-TiO 2 heterojunction and the introduction of NCQDs extended the visible light absorption range of photocatalytic materials. The BSA adsorption performances of different composite membranes were investigated, and the results showed that 0.5-NCQDs-BiOBr-TiO 2 /PVDF composite membranes had strong antifouling properties. Moreover, it was found that the 0.5-NCQDs-BiOBr-TiO 2 /PVDF composite membranes exhibited high regeneration stability and easy separation recovery performance. The results showed that the TC degradation rate of 0.5-NCQDs-BiOBr-TiO 2 /PVDF composite membranes reached 77% within 120 min. Moreover, the pseudo first order kinetic apparent rate constant k value of the 0.5-NCQDs-BiOBr-TiO 2 /PVDF composite membranes was 0.01342 min −1 .
Hongjie Liu,Minchen Hou,Hao Fu,Anjie Hu,Yanliang Zhai,Liwei Wang,Dong Zhai,Shaolong Zhang,Shaopeng Wang
Semiconductor photocatalysis is an ideal and sustainable solution to effectively remove Tetracycline (TC). Herein, a hierarchical flexible nanofibrous film (NF) heterojunction photocatalyst of BiOBr/TiO 2 was fabricated via a combination of electrospinning and solvothermal method, obtaining the two-dimensional (2D) BiOBr nanosheets uniformly anchored on the surface of one-dimensional (1D) TiO 2 nanofiber, and the amount of BiOBr significantly influences the physicochemical properties of the heterojunction photocatalyst, the optimal sample of BT-2 manifests large pore size and high surface area, prominent visible light response ability and narrow band gap as well as outstanding charge separation efficiency, thus achieves significantly enhanced photocatalysis activity for TC degradation, which is about twice higher than that of the pristine TiO 2 NF. More importantly, the BT-2 sample also displays high reusability and stability over a 10-cycle period and can be easy to recover. Meanwhile, the radical scavenging experiments and electron spin resonance characterization reveal that ·O 2 – and h + occupy an irreplaceable role in degrading TC. Moreover, regarding the analysis of intermediates and density functional theory calculations, the TC photodegradation mechanism and pathways are proposed. Our finding offers a prospective solution for designing BiOBr/TiO 2 heterojunction recyclable photocatalysts for efficient TC photodegradation.
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