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Preparation and Characterization of Ion-doped Type and Oxide or Noble-metal Supported Type TiO2 Nano-wire（belt）

Author: LiuYang
Tutor: LiHanPing；ZuoTianHao
School: Beijing Technology and Business University
Course: Environmental Science
Keywords: Hydrothermal method TiO2 nanobelts Ion doping Oxide load Noble metal deposition Visible Light Photocatalytic
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 43
Quote: 0
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Abstract


TiO 2 as an efficient environment for functional materials in pollutant photocatalytic degradation, the photoelectric conversion of new energy development and many other areas has tremendous application potential. But traditional TiO 2 photocatalytic technology but there are many deficiencies affect its usefulness. In this paper, an innovative and efficient ways prepared out of the novel TiO 2 nanobelts, and the rare earth metal ions the perovskite titanate - strontium titanate (Ba) wrapped, non-metallic nitrogen doped mixed, precious metals silver load performance modified, in order to fundamentally improve the photoelectric conversion efficiency and performance and enhanced photocatalytic fact, performance. System and in-depth study of a variety of modified TiO 2 nanobelts composite system to optimize the synthesis method, product performance evaluation and characterization of photocatalytic activity. Under hydrothermal conditions at different reaction time and temperature in different concentrations of NaOH solution, TiO 2 nano tape reacts to study the structure and morphology of the resulting product. Multiple test results show that the hydrothermal treatment in the conditions of alkali TiO 2 nanobelt titanate nanobelt having a layered structure is easy to generate, and the concentration of the NaOH solution, the time and temperature of the hydrothermal reaction conducted a study on the impact of the product morphology and mechanism. 2 by means of various tests to study the hydrothermal treatment has a two layered structure titanate into the anatase TiO 2 nano with the preparation process, the degree of difficulty and the mechanism of phase transformation. In certain conditions, the sodium titanate nanometer band difficult to completely converted into anatase-type TiO 2 , If the reaction temperature was increased and extended reaction times, can be prepared by pure anatase TiO 2 , but nanobelt morphology is severely damaged, and to determine the optimal transformation conditions and methods. Sodium titanate nanobelts or titanate nanobelts into the anatase TiO 2 nano with the phase transformation mechanism. 3. Use the titanate nanobelts has a layered structure and rare earth of Er 3 , the Yb 3 solution by ion exchange Hydrothermal Method Er 3 < / sup> and / or Yb 3 doped TiO 2 nanobelts. Various detailed characterization means that the rare earth ions into the TiO 2 lattice, and showed a strong upconversion luminescence characteristics, and by comparing the undoped sample with commodities P-25 photocatalyst evaluated its Visible Light Photocatalytic Degradation of Rhodamine B activity, and photocatalytic activity enhancement influencing factors and mechanism of the in-depth analysis. 4 Sr (OH) 2 or Ba (OH) 2 and TiO 2 nano with as precursor, prepared directly by the hydrothermal reaction got the cubic phase MTiO 3 (M = Ba or Sr) nanoparticles of TiO 2 nanocomposites load. Variety of testing means the composition of the product, phase, morphology, structure and optical properties of the detailed characterization. Catalytic degradation of Rhodamine B visible results confirmed that these nanocomposites had a higher photocatalytic activity, much higher than the P-25 nanoparticles photodegradation activity. 5. Invented a simple preparation synthesized Degradation of Rhodamine B high photocatalytic activity of N-doped metastable β-type TiO 2 nanobelts. The preparation process including the NH4 ion exchange process under ambient conditions and air calcination. A variety of characterization means that the N atoms enter the Ti0 2 (B) of the lattice caused a large absorption of visible light, showing than the undoped pure anatase phase of TiO the 2 < / sub> nanobelts and commodities P-25 nano particles photocatalyst higher photocatalytic activity. Prepared by room temperature chemical complex and restore the the Ag nanoparticles load anatase TiO 2 nanobelts, and using a variety of analytical tools morphology of the optical properties of the structure of the system done detailed tests confirmed that a load of 10-20nm Ag nanoparticles, and found to significantly broaden the capabilities and range of visible light response after load Ag and make use of the advantages of the composite system to substantially increase the separation efficiency of the carrier, the redox reaction efficiency also its photocatalytic activity by the line in-depth evaluation and mechanism analysis.

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