Ultrasonic-assisted synthesis of visible-light-driven TiO2/Bi2O3 nanocomposite photocatalysts: characterization, properties and azo dye removal application

Ultrasonic-assisted synthesis of visible-light-driven TiO2/Bi2O3 nanocomposite photocatalysts:... TiO2/Bi2O3 nanocomposites (Sonic-TiO2/Bi2O3) were synthesized via combination of thermohydrolysis and ultrasonic chemical precipitation techniques. For the sake of contrast, pure TiO2 nanoparticles (NPs) and conventional TiO2/Bi2O3 nanocomposites (Stir-TiO2/Bi2O3) were also prepared. XRD, FT-IR, FE-SEM, TEM, EDX and UV–Vis studies were adopted to determine the structural, chemical composition and optical properties of the as-prepared samples. The photocatalytic activities of the samples were evaluated by measuring the photo-degradation of Orange II in aqueous solution under visible light irradiation (λ ≥ 400 nm). The efficiencies towards OII degradation were determined to be 44.0, 81.8 and 94.7 % for pure TiO2 NPs, Stir-TiO2/Bi2O3 and Sonic-TiO2/Bi2O3, respectively. These results reveal that the loading of Bi2O3 can greatly improve visible light photocatalytic performance of TiO2, and the ultrasonic treatment can also improve photocatalytic performance of TiO2/Bi2O3 nanocomposites. Based on the experimental results, possible enhanced visible-light photocatalytic degradation mechanisms were also discussed. The present findings may provide a new approach to synthesize high efficiency TiO2/Bi2O3 nanocomposite photocatalysts. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Ultrasonic-assisted synthesis of visible-light-driven TiO2/Bi2O3 nanocomposite photocatalysts: characterization, properties and azo dye removal application

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Springer Netherlands
Copyright © 2014 by Springer Science+Business Media Dordrecht
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
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