Highly efficient heterostructured stannic disulfide/stannic anhydride hybrids: Synthesis, morphology, and photocatalytic reduction of chromium (VI) under visible light

Journal of Colloid and Interface Science
Meng SunYu Shao

Abstract

Highly efficient heterostructured stannic disulfide/stannic anhydride (SnS2/SnO2) hybrids with different morphologies were fabricated via a two-step hydrothermal method. The composition and morphology of the obtained products were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and UV-vis diffuse reflectance spectroscopy (DRS). The SEM images showed that core-shell structured SnS2/SnO2 nanotubes and hierarchical SnS2 flowers decorated with SnO2 particles were fabricated under different synthetic conditions. The DRS results of the hybrids showed that the absorption edges were gradually redshifted with increasing SnS2 content. In the photocatalytic reduction of chromium (VI) under visible light, the SnS2/SnO2 hybrid prepared with thioacetamide addition of 0.60 g exhibited the best photocatalytic activity, which was approximately 6.8 times higher than that of pure SnS2. This increase in the reduction performance might be ascribed to the strengthened absorption of visible light, the rapid interfacial charge transfer and the promoted charge separation efficiency. Photocurrent- response measurements, electrochemical impedance spectroscopy, and photoluminescence emis...Continue Reading

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