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Preparation and Photocatalytic Behavior of Zn2+ Doped TiO2 One-dimensional Nanomaterials

Author: HeXiaoDong
Tutor: DongHongYing
School: Inner Mongolia University of Technology
Course: Chemical processes
Keywords: Zn2 doping TiO2 nanofibers TiO2 nanotubes Photocatalysis Visible Light Photocatalytic
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 81
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Abstract


TiO 2 nanomaterials in photocatalytic degradation of pollutants, dye-sensitized solar cells, photolysis of water, etc. has a broad application prospects. TiO 2 band gap wider, the lower the efficiency of the use of solar energy, which restricts its application in practice. This thesis is modified from materials and morphology improve two angles TiO 2 nano-materials under visible light catalytic activity and practicality. Successfully prepared TiO 2 nano powder, nanofibers, nanotubes and Zn 2 modification by doping TiO 2 nanofibers, nanotubes . Test using differential scanning calorimetry - thermal gravimetric analysis, X-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy, specific surface area tester, multi-angle ultrafine particle analyzer and Fourier transform infrared spectrometer morphology of the material prepared , structure, and performance characterization. TiO 2 nano-materials, combined with DSC and XRD analysis found that, from the gel to the TiO 2 nano-materials in the calcination process, about 400-450oC to form TiO 2 < / sub> anatase and rutile phase formation at about 450-550oC. The synthesized TiO 2 nano the uniform powder particle size distribution, average particle diameter of 30nm, obvious aggregation phenomenon, the specific surface area of ??approximately 40m2 / g. Prepared TiO 2 nanofibers 400oC, 450oC, 500oC 600oC calcined After 4 hours, a fiber diameter down to 100-500nm; TEM analysis shows prepared as TiO 2 fiber from some of 5-10nm small particles piled up, by 400oC calcined 4 hours after TiO 2 for 70.81m2 / g fiber than the surface area. For Zn 2 in doping of TiO 2 nanofibers, XRD, SEM and spectroscopy analysis confirmed that Zn 2 doped enter to TiO 2 crystal lattice. Zn 2 ion doping concentration increased DSC curve peak temperature increase, but the change only slightly, namely Zn 2 doping can reduce TiO 2 nanofibers into phases and phase transition temperature; the tests Zn 2 doping concentration 0.52at% 400 ℃ calcination after 4h of TiO 2 nanofibers than The surface area of ??64.77m2 / g. Successfully prepared TiO 2 nanotubes are prepared using coaxial electrospinning method TiO 2 nanotubes calcined at 400 ℃ for 4h good looks, smooth wall, the diameter uniform, a wall thickness of approximately 50 nm. The application of quantum chemical density functional theory TiO 2 materials and their transition metal Zn 2 ion doped structure simulation, analysis showed that Zn 2 < / sup> ion doped enable the band gap becomes smaller, optical absorption edge redshift favor the photocatalytic properties under visible material. The the prepared TiO 2 nanomaterials in the UV and visible light photocatalytic properties. Experimental results show that, in the ultraviolet region, the prepared TiO in the experimental range 2 nanomaterials highest photodegradation rate of methyl orange: TiO to 2 nano powder 85% TiO 2 nanofibers 69% Zn 2 doped TiO 2 nanofibers 52% TiO 2 < / sub> tube is only 30%. As can be seen, the material modification and physical alteration of TiO 2 materials photocatalytic properties in the UV region; within the experimental range in the visible region, the preparation of a variety of TiO < sub> 2 nano-materials of the highest photodegradation rate of methylene blue were: the TiO 2 nano powder 25% TiO 2 32% of the nanofibers TiO 2 nanotubes 80%, the Zn 2 doped TiO 2 nanofibers 88%, Zn 2 doped TiO 2 nanotubes 92%. Shows that the modified and morphology of the material can be changed to improve the TiO 2 materials in the visible light photocatalytic properties. For the TiO 2 nanomaterials practical to provide the necessary theoretical basis.

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