Abstract
This paper reports the novel synthesis and evaluation of visible-light-active SnS2/SnO2 nanocomposite for photocatalytic reduction of aqueous Cr(VI). An alternative one-step chemical synthesis method, which was based on heating the mixture of Sn, S and NH4Cl powders in air at 320°C for 3h, was proposed for the synthesis of SnS2/SnO2 nanocomposite. The structure, composition and optical property of the as-synthesized SnS2/SnO2 nanocomposite were characterized by X-ray diffraction, wavelength dispersive X-ray fluorescence spectroscopy, transmission electron microscopy, high-resolution transmission electron microscopy and UV–vis diffuse reflectance spectrum. The photocatalytic activity of the as-synthesized SnS2/SnO2 nanocomposite was tested in the reduction of aqueous Cr(VI) under visible-light (λ>420nm) irradiation, and compared with that of SnS2 nanoflakes. It was observed that the as-synthesized SnS2/SnO2 nanocomposite exhibited much higher photocatalytic activity than SnS2 nanoflakes in the reduction of aqueous Cr(VI) under visible-light (λ>420nm) irradiation, suggesting SnS2/SnO2 nanocomposite is a more promising visible-light-active photocatalyst as compared with SnS2. Besides, the electrochemical impedance spectroscopy analysis supported the photocatalytic results.
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