The Preperation Of Zinc Oxid Nanomaterials And Their Photocatalytic And Antibacterial Properties

ZnO nanostructure is a kind of band new material with the development of nanotechnology. Compared with the traditional ZnO, ZnO nanoparticles have quantum size effect, small size effect, surface effect and interface effect, so it shows many special features in catalysis, optics, magnetism and mechanics. ZnO nanostructure has so many important application in the areas of ceramics, chemical, electronic, optical, biological, pharmaceutical. So the research of ZnO nanoparticles has been a hot research spot of nanotechnology for so long. At present, the preparation and properties is the main content of the ZnO nanoparticles research. Scientists have used various methods to prepare ZnO nanoparticles with different morphologies. A great breakthrough has been made in the preparation optimizing and morphology controlling. In addition, scientists also found a number of unique properties of ZnO nanoparticles through continuous exploration.In this thesis, the preparation and properties of nano-sized zinc oxide are presented. The morphology of nano-sized zinc oxide has been controlled by changing the preparation conditions. Meanwhile, the properties of photocatalytic and antibacterial were reported.A simple route was reported to synthesize variously morphological ZnO nanoparticles by selecting different ratios between water and ethanol as reaction medium under solvothermal condition. As increasing the content of water in the reaction, the shape of ZnO nanoparticles changed gradually. When there's a little water, the morphology of ZnO nanoparticles was granule-like shape. When there was more water, the nanoparticles grew toward four directions. With the volume of water increasing further, the growing speed of two directions was slow down. When there was pure water, the ZnO nanoparticles were flake-like shape, and the nanoparticles grew along the edge. In addition, the photocatalytic activity has been investigated by degradation of methyl orange. The photocatalytic activity was depended on the morphology of ZnO. At the same time, we also studied the optimum reaction condition of photocatalysis.ZnO nanoparticles were prepared by using a simple method, and their morphology could be controlled by changing the ratio of reactant. Flake-like and flower-like zinc oxide particles were synthesized through this reaction system. The growth mechanism was studied. The flower skeletons of flower-like ZnO nanoparticles were formed at prime stage of the reaction. The size of flower-like ZnO nanoparticles was increasing with the reaction. In addition, the property of photocatalysis was analyzed. The result shows that all the samples of zinc oxide have fine photocatalytic properties.Calcinations process and polyol process were established to prepare ZnO nanoparticles. The ZnO nanoparticles prepared through calcinations process has many advantages, such as simple preparation, low cost and mass produced, but the nanoparticles'reuniting was also appeared at the same time. The polyol process is a kind of band new method to prepare ZnO nanoparticles. The polyol not only involves in redox reaction, but also controls the growth of nanoparticles as stabilizing agent. Flower-like zinc oxide was prepared through polyol process and it has fine dispersion.Heterogeneous Ag@ZnO nanomaterial was prepared via two different methods. The photocatalysis properties of the samples were tested. The result shows that the heterogeneous Ag@ZnO nanomaterials have better photocatalysis property than the pure phase zinc oxide.Different morphologies of ZnO nanoparticles were prepared by different methods. The antibacterial properties of the samples were tested. It shows that all of the samples have fine antibacterial property. Preliminary analysis was made for the antibacterial mechanism of the samples.