Anatase Tio < Sub > 2 < / Sub > Nano And Assemble The Ultra Structure Of Controllable Preparation And Catalytic Properties

Anatase TiO2nanoflake-based flowerlike nanoarchitectures, variable diameters nanosheets nanostructures have been synthesized through solvothermal routes. Morphologies and structures of these products were characterized by means of Scanning Electron Microscopy, Transmission Electron Microscopy, X-ray diffraction and IR spectrum. The role of different complexing agent and solvent in the information process of the TiO2nanostructures with different morphologie have been investigated, the processes of nucleation, growth and self-assemble of TiO2nanostructures in various geometrical morphologies were studied, and the possible formation mechanisms of TiO2nanostructures were proposed. In addition, the photocatalytic behaviors of TiO2nanostructures with various morphologies were studied, and the relations between morphologies, diameter and propeties have been investigated.(1) Anatase TiO2nanoflake-based flowerlike nanoarchitectures:hydrothermal synthesis, formation mechanism and photocatalytic properties:flowerlike nanoarchitectures constructed with TiO2nanoflakes were synthesized through a simple solvothermal reaction of butyl titanate (TBOT) with HF in isopropyl alcohol at180℃for12h. The flowerlike nanostructures with diameters of about1.70-2.20μm are constructed from TiO2nanoflakes with the tetragonal phase structure. The constituent nanoflakes have perfect rectangular shapes with the typical widths of0.83-0.85μm, length of1.04-1.20μm and thicknesses of0.08-0.12μm.. The role of HF and isopropyl alcohol in the formation and self-assembly of anatase TiO2nanoflakes into flowerlike nanostructures was investigated by tuning without HF in system and the different solvent are used as a substitute for isopropyl alcohol, and a possible growth mechanism have been proposed. Photocatalytic properties of the products were studied. The results indicate that the flowerlike nanostructures constructed with TiO2nanoflakes are effective photocatalyst for the degradation of methyl orange in comparison with commercial TiO2powders. The photodegradation of methyl orange dye catalyzed by the TiO2nanoflake-based flowerlike nanostructures is a pseudo first-order reaction.(2) The controllable synthesis, formation mechanism and photocatalytic properties of TiO2nanosheets with various diameters:TiO2nanoflakes were synthesized via a solvothermal reaction of titanium butoxide with HF in isopropanol at200℃for12h. The different sizes of nanosheets are controlled synthesis by changing the volume of titanium butoxide and reactive time. The role of solvents and HF has been investigated, the result show that isopropanol and HF play the role of synergistic in the formation of the nanosheets, a possible growth mechanism has been proposed. The photocatalytic activity of the as-prepared products in different conditions for the degradation of methyl orange was studied. With the decreasing sizes of TiO2nanosheets, its exhibit enchanced photocatalytic ability to degrade methyl orange dye; the photocatalytic ability of the TiO2nanoflakes that was obtained at200℃for1.0h is the most. The products small size of its large specific surface area, adsorption fuel capacity, degradation of group ability, light catalytic effect is the best.