High-Performance Visible-Light-Driven SnS(2)/SnO(2) Nanocomposite Photocatalyst Prepared via In situ Hydrothermal Oxidation of SnS(2) Nanoparticles
作者：Zhang, Yong Cai，Du, Zhen Ni，Li, Kun Wei，Zhang, Ming，Dionysiou, Dionysios D
關鍵字：in situ oxidation synthesis, nanocomposites, photocatalysis, stability, tin oxide, tin sulfide
論文來源：期刊
具體來源：ACS Applied Materials & Interfaces
發表時間：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.