Hydrothermal synthesis of SnO_2/SnS_2 nanocomposite with high visible light-driven photocatalytic activity

摘要

SnO_2/SnS_2 nanocomposite with a heterojunction structure (that is, SnO_2 nanoparticles-decorated SnS_2 nanoplates) was synthesized via the hydrothermal reaction between SnO_2 nanoparticles and thioacetamide in 5 vol.% acetic acid aqueous solution at 150 °C for 3 h, and characterized by X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy and UV-vis diffuse reflectance spectra. The photocatalytic activity of the hydrothermally synthesized SnO_2/SnS_2 nanocomposite was tested by degrading methyl orange in distilled water under visible light (λ>420 nm) irradiation. It was found that the hydrothermally synthesized SnO_2/SnS_2 nanocomposite exhibited superior photocatalytic activity to SnO_2 nanoparticles, SnS_2 nanoplates and physically mixed SnO_2/SnS_2 nanocomposite. The heterojunction structure of the hydrothermally synthesized SnO_2/SnS_2 nanocomposite, which can facilitate interfacial electron transfer and reduce the self-agglomeration of two components, was considered to play an important role in achieving its higher photocatalytic activity.