Synthesis and visible light photocatalytic behavior of WO3 (core)/Bi2WO6 (shell)

• WO3 (core)/Bi2WO6 (shell) photocatalysts were synthesized.
• The Bi2WO6 shells have evenly been deposited over the WO3 cores.
• Results showed that RhB can be decomposed using a 4 W LED lamp as visible light.
• WO3/Bi2WO6 samples show a remarkably higher photocatalytic activity than pure WO3.
• The mechanism for the efficient photocatalytic activity of WO3/Bi2WO6 is discussed.

WO3 (core)/Bi2WO6 (shell) photocatalysts were fabricated via a hydrothermal reaction followed by heat treatment, and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM–EDX), UV–vis diffuse reflection spectra (DRS), and photoluminescence spectra (PL). The photocatalytic activities of WO3/Bi2WO6 samples with capped geometries were tested by the oxidation of the rhodamine B using a 4 W white-luminescence light emitting diode (LED) lamp as the visible light source, and all WO3/Bi2WO6 samples show the remarkably greater photocatalytic activity than the pure WO3 sample. The possible mechanism for the enhanced photocatalytic performance of the WO3/Bi2WO6 samples is discussed.

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