作者：Zhang, Yong Cai，Du, Zhen Ni，Li, Kun Wei，Zhang, Ming，Dionysiou, Dionysios D
关键字：in situ oxidation synthesis, nanocomposites, photocatalysis, stability, tin oxide, tin sulfide
论文来源：期刊
具体来源：ACS Applied Materials & Interfaces
发表时间：2011年
SnS₂/SnO₂ nanocomposites with tunable SnO₂ contents were prepared via in situ hydrothermal oxidation of SnS₂ nanoparticles in 0.375–4.5 mass% H₂O₂ aqueous solutions at 180 °C for 0–12 h. The structure, composition and optical properties of the as-prepared SnS₂/SnO₂nanocomposites were characterized by X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, Brunauer–Emmett–Teller (BET) surface area analysis, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and UV–vis diffuse reflectance spectra. Furthermore, their photocatalytic properties were tested for the degradation of methyl orange in water under visible light (λ > 420 nm) irradiation. It was found that the as-prepared SnS₂/SnO₂ nanocomposites with suitable SnO₂ content not only demonstrated superior photocatalytic activity to both SnS₂ nanoparticles and physically mixed SnS₂/SnO₂ composite nanoparticles, but also had remarkable photocatalytic stability. The tight attachment of SnO₂ nanoparticles to SnS₂ nanoparticles, which can facilitate interfacial electron transfer and reduce the self-agglomeration of two components, was considered to play an important role in achieving the high photocatalytic performances exhibited by the as-prepared SnS₂/SnO₂ nanocomposites.