Abstract
Novel WO3/H2WO4 heterostructures with different contents of WO3 were synthesized through a simple thermodecomposition method. Thermogravimetry and differential thermal analysis (TG–DTA), X-ray powder diffraction (XRD), Fourier transform infrared spectrometry (FT-IR), UV–vis diffuse reflectance spectroscopy (DRS) and N2 adsorption and desorption isotherms were employed to study the structures, morphologies, optical properties and specific surface area of the as-prepared samples. Degradation of rhodamine B (RhB) was carried out to evaluate the photocatalytic activity of samples under visible light irradiation (λ > 420 nm). WO3/H2WO4 heterostructure with 51.04 wt% WO3 presented the highest photocatalytic activity with apparent kapp of 0.0330 min−1. The increased photocatalytic activity of WO3/H2WO4 could be attributed to the formation of the heterojunction between WO3 and H2WO4, which suppresses the recombination of photoinduced electron–hole pairs. Moreover, the tests of radical scavengers confirmed that O2− and h+ were the main reactive species for the degradation of RhB.
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