Synthesis and investigation of SnS_2/RGO nanocomposites with different GO concentrations: structure and optical properties, photocatalytic performance

摘要

AbstractIn this study, we report the synthesis of tin disulfide/reduced graphrene oxide (SnS2/RGO) nanocomposites by a simple one-step hydrothermal method. In order to investigate the effect of RGO on the structure and optical properties and photocatalytic activity of the products a series of nanocomposites was prepared with different concentrations of GO. The samples were examined using X-ray diffraction, field emission scanning electron microscopy (FESEM), Raman spectroscopy, UV–Vis spectroscopy and photoluminescence techniques. The results confirmed the growth of SnS2with the hexagonal phase. FESEM analysis showed that the hexagonal tin disulfide nanoplates are uniformly dispersed on the surface of the graphene oxide sheets. The optical examination of SnS2and SnS2/RGO nanocomposites indicated that the band gaps of all nanocomposites are greater than that of SnS2due to the quantum confinement effect. The photocatalytic activity of the SnS2/RGO nanocomposites was investigated for degradation of the acid orange 7 dye under visible light. It was observed that all nanocomposites have a higher photocatalytic activity for the degradation in comparison with pure SnS2. The optimum concentration of GO in SnS2/RGO nanocomposite for achieving the highest photocatalytic efficiency (81%) was determined as 2 mg ml−1during 180 min.