Facile Synthesis of Uniform Zinc-blende ZnS Nanospheres with Excellent Photocatalytic Activity爐oward Methylene燘lue Degradation

摘要: Uniform and well-dispersed ZnS nanospheres have been successfully synthesized via a facile chemical route. The crystal structure, morphology, surface area燼nd爌hotocatalytic properties of the爏ample were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) and ultraviolet-visible (UV-vis) spectrum. The results of characterizations indicate that the products are identified as mesoporous zinc-blende ZnS nanospheres with an average diameter of 200 nm, which are comprised of nanoparticles with the crystallite size of about 3.2 nm calculated by XRD. Very importantly, photocatalytic燿egradation爋f爉ethylene blue (MB)爏hows that the as-prepared ZnS nanospheres exhibit excellent photocatalytic activity with nearly 100% of MB decomposed after UV-light irradiation for 25 min. The excellent photocatalytic activity of ZnS nanospheres can be ascribed to the large specific surface area and hierarchical mesoporous structure.