Abstract
BiVO4/TiO2 composite photocatalysts were successfully synthesised via different methods, and the physical and photophysical properties of the as-prepared photocatalysts were fully characterised by X-ray diffraction, scanning electron microscopy, field-emission transmission electron microscopy, energy dispersive spectroscopy, UV-vis diffuse reflectance spectroscopy, photoluminescence spectroscopy and Brunauer–Emmett–Teller (BET) surface area analysis. Methylene blue was selected as model pollutant to investigate the photocatalytic activity of BiVO4/TiO2 composite materials. The results reveal that BiVO4/TiO2 fabricated by different methods exhibits higher photocatalytic activity than pure BiVO4 and TiO2, and the coprecipitated BiVO4/TiO2 composite shows the best photocatalytic activity. The diffuse reflectance spectroscopy results demonstrated that the 20 wt-% coprecipitated BiVO4/TiO2 exhibited a significant, broad spectrum response not only between 400 and 500 nm but also from 500 to 800 nm wavelength.
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