Preparation and adsorption property of hollow MoS2 microspheres composed of nanoflakes

摘要

The hollow molybdenum disulfide (MoS2) microspheres composed of nanoflakes were successfully synthesized via a facile hydrothermal method, in which molybdenum trioxide (MoO3) and potassium thiocyanate (KSCN) were used as Mo and S source, and hexadecyltrimethyl ammonium bromide (CTAB) was as a surfactant. The hollow MoS2 microspheres obtained at different hydrothermal temperatures significantly influence their purity, crystalline quality and thermal stability. X-ray diffraction, energy dispersive, thermal gravimetric analysis, Brunauer-Emmet-Teller, a UV-visible spectrophotometer (UV-Vis), field-emission scanning electron microscopy, transmission electron microscopy and Fourier transform infrared spectroscopy were used to characterize the samples. The weak hydrolysis of MoO3 in the solution and interaction with the surfactant CTAB plays an important role in the formation of the hollow structure of MoS2 microspheres. In addition, the final adsorption capacity of the MoS2 for the different concentrations of methylene blue (MB) solutions was studied in detail. The removal and the adsorption capacity of MoS2 sample for 200 mg L-1 of MB solution could reach 85.94% and 343.74 mg g(-1) after 10 min, respectively. The result indicates that the hollow MoS2 possess a significant adsorption ability for dye in the solution, which might be anticipated to be used in wastewater treatment.