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• W3135601050 abstract "• The Bi 4 O 7 nanosheets were fabricated as an NIR light responsive photocatalyst. • Synergetic effects of Bi 5+ and oxygen vacancies enhanced the NIR light driven photocatalysis. • The photocatalytic mechanism was unveiled based on the experiments and DFT calculations. The appropriate energy level position of photocatalysts dominates the photocatalytic redox reaction and utilization efficiency of solar energy for wastewater treatment. Herein, we report a near-infrared (NIR) light driven Bi 5+ -rich Bi 4 O 7 photocatalyst, achieving a greatly enhanced photocatalytic activity for pollutant removal compared with Bi 3+ -replenished Bi 2 O 3 . Density functional theory calculations show the formation of an intermediate band in the Bi 4 O 7 structure because of the hybridization of O 2p and Bi 4s orbits. The formation of the intermediate band not only narrows the band gap but also improves the optical absorption property and separation efficiency of the photoinduced carriers. The existence of the oxygen vacancies (OVs) in the Bi 4 O 7 nanosheets ensures high carriers’ concentration, which is verified by the Hall effect test. The synergetic effects of the OVs and Bi 5+ greatly accelerate the separation efficiency of the photogenerated carriers. Consequently, the Bi 4 O 7 nanosheets exhibit enhanced NIR light driven photocatalytic activity for the degradation of rhodamine B and ciprofloxacin compared with the bulk Bi 2 O 3 . This study paves the way to the design of highly efficient NIR light-responsive Bi-based photocatalysts for environmental purification." @default.
• W3135601050 created "2021-03-15" @default.
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• W3135601050 date "2021-09-01" @default.
• W3135601050 modified "2023-10-16" @default.
• W3135601050 title "Synergetic effects of Bi5+ and oxygen vacancies in Bismuth(V)-rich Bi4O7 nanosheets for enhanced near-infrared light driven photocatalysis" @default.
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• W3135601050 doi "https://doi.org/10.1016/j.jmst.2021.01.022" @default.
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