Study On The Synthesis And Application Of Nano/Micro Sulfide

How to control the morphology and size of nanoparticles is the key to design, construct and applicate the nanometer devices, which is a frontier, challenged and an important scientific question. The properties and synthesis of metal sulfur nano-materials have already received extensive attention because of the unique optical, electrical, magnetic, catalytic and other physical and chemical properties. This work mainly uesd the green synthesis method with Bovine Serum Albumin(BSA) as the template agent and stabilizer, solvothermal method and hydrothermal method to design the reaction course to synthesize novel metal sulfides by controling the reaction temperature, reaction time, the ratio of reactant and solvent. This thesis is divided into five parts:Part 1: This part mainly introduces the application and development of nano-material and the main method to synthesize nano-materials.Part 2: We design a BSA assisted method, which is convenient, simple, non-toxic and environmental friendly. Using our method, the BSA/CuS nanoparticles are successfully synthesized at different concentration of BSA as the foaming and stabilizing reagent at different temperatures. Samples are tested by X-ray powder diffraction(XRD), scanning electron microscope(SEM), dynamic light scattering(DLS), infrared spectra(FT-IR), field emission scanning electron microscopy(FESEM) and energy dispersive X-ray spectroscopy(EDX) for structure and property characterization. This method is simple, environment friendly and consistent with the idea of green chemistry.Part 3 and part 4: Using a simple solvothermal method, we successfully synthesize copper sulfide nanoparticles by changing reactant concentration, solvent and the reaction time. Catalyst samples are characterized by XRD, SEM, FESEM and EDX. The result shows that CuS nanostructure seems like flowers. The effect of CuS nanoparticles on the catalytic oxidation was investigated. The catalytic activity of the samples that we synthesized are evaluated by heterogeneous catalytic ozonation of landfill leachates. Comparing with the effect of ozonation and ozonation/CuS, it could be concluded that the CuS nanoparticles improve the efficience of removal of COD from landfill leachate. These results might be helpful for sewage treatment and designing new catalyst having high efficience. This process is easy to achieve with inexpensive operating cost and the low demand for reaction equipment.Part 5: We synthesize zinc sulfide micro-sphere, using ZnSO4·7H2O, TAA as raw material and CTAB as surfactant, at 120 ℃, 16 h. XRD, SEM, FESEM, EDX are used to characterize a series of products. The experimental results show that the preparation of zinc sulfide belongs to cubic sphalerite. Reaction time, reaction temperature, surface active agent, sulfur source have important influence on the morphology of zinc sulfide.