Abstract
ZnS-Reduced graphene oxide (ZnS-RGO) nanocomposites were successfully synthesized via a facile one-step hydrothermal route, in which ZnS nanoparticles uniformly dispersed on the RGO sheets. The detail structure, morphology and optical properties of as-prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR), Raman spectra, thermogravimetric analysis (TGA), Room-temperature photoluminescence (RT-PL) and UV–vis diffuse reflectance spectra (DRS). The ZnS-RGO nanocomposite containing 15% RGO exhibited the highest visible-light photocatalytic degradation rate for the methylene blue (MB) aqueous solution, and the degradation rate of MB finally reached a maximum of 89.43% after visible-light irradiation for 240 min. However, the pure ZnS with a wide band gap only showed a lower degradation rate of 35.27%. The enhancement of photocatalytic degradation rate is proposal to be due to the photosensitization of graphene illuminated by visible light, in which the photoexcited electrons from graphene can rapidly transfer to the conduction band of ZnS, resulting in improving photocatalytic activity.
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