Abstract
A series of 3D hierarchical microsphere heterojunction composites combining BiOBr and Bi-MOF (Bi-TDC) supported by 2,5-thiophene dicarboxylate acid (H2TDC) was fabricated by one-step solvothermal method. Hexadecyl trimethyl bromide (CTAB) is used as the structure guide reagent and Br source to design BiOBr/Bi-TDC composites and enhance catalytic activity. The ultrasound-assisted photocatalysis effect of BiOBr/Bi-TDC for RhB and TC can reach 99.8 % and 96.1 % in 30 min, respectively. Further, the influence factor of photocatalytic degradation TC solution were explored, including pH, initial pollutant concentration, catalyst dosage and different proportions of BiOBr and Bi-TDC. The excellent catalytic activity can be attributed to the construction of heterogeneous interfaces and rich oxygen vacancies (OVs), which improve the low redox potentials and facilitate the separation of photogenerated electron-hole pairs. Radical trapping experiment is made and shown •O2− and h+ are the most active species for the photodegradation process. The EPR characteristic is also used to explore free radicals when exposed to the visible light illumination.
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