采用空气中热氧化法制备SnS2/SnO2系列复合纳米材料。采用XRD、UV-vis对其结构和光吸收性能进行表征。考察了合成材料的可见光还原K2Cr2O7水溶液的性能。光催化实验结果表明，所制得的SnS2/SnO2复合材料在可见光区域具有明显的光吸收能力；300℃时加热1h所得的SnS2/SnO2-B具有最高可见光催化活性，且具有比SnS2和PM-SnS2/SnO2-B更高的光催化活性。%Thermal oxidation method was proposed for the synthesis of SnS2/SnO2 nanocomposite: first, SnS2 nanoflakes were synthesized by hydrothermal method;second, SnS2/SnO2 nanocomposite was obtained by thermal oxidation of SnS2 nanoflakes in air. The composition and structure and optical properties of the as-synthesized nanocomposite were characterized by XRD and UV-vis diffuse reflection spectroscopy. The photocatalytic properties of SnS2/SnO2 nanocomposite were tested by the reduction of aqueous Cr( Ⅵ ) under visible-light (λ>420nm) irradiation, and compared with those of SnS2 nanoparticles and PM-SnS2/SnO2-B (which denotes the physically mixed SnS2/SnO2 nanocomposite with the same composition as SnS2/SnO2-B). It was observed that SnS2/SnO2-B displayed higher visible-light-activated photocatalytic activity than SnS2 and PM-SnS2/SnO2, but the initial concentrations of K2Cr2O7 aqueous solution affected the photocatalytic reduction efficiency.
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