Preparation and Photocatalytic Capacity Evaluation of TiO2/BiVO4 Nanocrystalline Heterojunctions
TiO2/BiVO4 heterojunction nanostructures were successfully synthesized via a facile hydrothermal synthesis coupling with impregnation strategy to enhance the visible-light-driven photocatalytic properties of BiVO4 nanocrystals. The samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM) and UV-vis diffuse reflectance spectra (DRS), as well as evaluated via photocatalytic test. The experimental results reveal that these TiO2/BiVO4 heterojunction nanostructures exhibit higher visible-light photocatalytic activities than both the individual BiVO4 nanocrystals and TiO2 for the degradation of model dye methylene blue. The optimum composition of TiO2 was 70% (mass ratio). The enhanced photocatalytic efficiencies are attributed to the enhancement of the wide spectrum responsive. The nanostructures are expected to show considerable potential applications in solar-driven waste water treatment.
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Document Type: Research Article
Publication date: August 1, 2016
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