Abstract
Coupling morphology modification with heterojunction is an effective strategy to promote the photocatalytic activity of TiO2-based photocatalysts for wastewater treatment. In this work, we devise a novel flower-like TiO2/Bi2O3 (FTB) photocatalyst through the deposition of Bi2O3 nanoparticles on the surface of flower-like TiO2 (FT). Various characterization techniques reveal the successful construction of p-n heterojunction at the interfaces of flower-like TiO2 and Bi2O3, which promotes efficient charge separation. Benefiting from the narrow bandgap of Bi2O3 and flower-like microstructure, the photocurrent of FTB is about 1.67 times higher than that of FT, leading to higher photo-degradation rate (92.7%) of levofloxacin than that (∼80%) of FT photocatalyst. More important, FTB presents a good anti-interference capability for environmental factors including solution pH, ionic strength, and water matrix. Additionally, the photocatalytic performance and microstructure of FTB photocatalyst remain unchanged before and after five cycles, suggesting a good cyclability. Therefore, this work offers a new insight in constructing TiO2-based photocatalysts with advanced performance for efficient removal of antibiotics.
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