Alkali-Induced in Situ Fabrication of Bi2O4-Decorated BiOBr Nanosheets with Excellent Photocatalytic Performance

A simple alkali (NaOH) post-treatment approach assisted with light irradiation to in situ obtain Bi2O4 nanoparticle-decorated BiOBr nanosheets, brown BiOBr-0.01, is presented for the first time. Bi2O4 nanoparticles are formed due to a combined action of NaOH-induced dehalogenation and light triggered photogenerated hole (h+) oxidation processes on the surface of BiOBr nanosheets. Importantly, by varying the NaOH concertation in the post-treatment, the content of Bi2O4 phase in the hybrid structures can be easily tuned, and predominantly exposed highly reactive {001}-facet of BiOBr nanosheet can be well preserved. Significantly, without any foreign elements, the light absorption of as-prepared BiOBr-0.01 is extended to the near-infrared (NIR) region. In comparison with normal BiOBr, brown BiOBr-0.01 nanosheet shows superior photocatalytic activity for the dye degradation and microbial disinfection. Particularly, it exhibit excellent capability to photocatalytically reduce CO2 into CO and CH4, whereas the n...

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