The Preparation And Application Of Hydroxyapatite Nanotubes And Ni-Based Catalysts

With the rapid development of the nanoscience technology, the preparation and application of the nanomaterials have become a hot issue in the scientific research. Due to their remarkable effect of quantum size, small size effect, surface effects and the tunnel effect of macroscopic quantum, the nanomaterials play more and more important role in many fields, especially in biomedicine and catalysis.The paper are focused on the controlled preparation of nanomaterials and their applications in biomedicine and catalysis field. Hydroxyapatite and nickel both are widely studied inorganic materials due to excellent physical, chemical and biological property. In this present paper, we focused on single crystal hydroxyapatite nanotubes: preparatio and application of osteoblast proliferation; Ni-based catalysts:preparation and application of single-step conversion of nitrobenzene to p-Aminophenol. The main work in this thesis is as follows:1. At the present of organic amine, we synthesized single crystal hydroxyapatite nanotubes by using Ca(H2PO4)2·2H2O and CaCl2 as precursors through simple hydrothermal method. The morphology and structure of the materials were characterized by TEM, HRTEM, XRD, IR, nitrogen adsorption-desorption, etc. The HA nanotubes were carried out mouse cell growth behavior in vitro and compared with HA nanorods. Our investigations discover that HA nanotubes have an excellent effect on the cell proliferation.2. The Ni@C catalysts were prepared by hydrothermal reaction of glucose and as-prepared flower-like Ni(OH)2 nanosheets which were also obtained via a hydrothermal process. The structural characteristics of the catalysts were investigated by TEM, HRTEM, XRD, RAMAN, nitrogen adsorption-desorption, etc. The results showed that the structure of the materials looks like flowers. The Ni nanoparticles with uniform diameters of 5nm were completely coated by about 1-3 layers graphene layers and highly dispersed on the "petals". The catalysts possess good activities and stability for synthesis of para-aminophenol from nitrobenzene under the strongly acidic conditions:the conversion is 100%, the electivity is 99.5%. The catalytic performance were unchanged, even after the catalysts have been used for 20 times.