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Preparation and properties of nano-titanium dioxide photocatalyst

Author: YuYanHui
Tutor: MengHaRiBaLa
School: Henan Polytechnic University
Course: Mineral Processing Engineering
Keywords: Nano-titanium dioxide Fe-doped Hollow nanospheres Photocatalyst Degradation
CLC: O643.36
Type: Master's thesis
Year: 2009
Downloads: 178
Quote: 0
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Abstract


Nano-titanium dioxide (TiO 2 ) is an important green materials, has been extensively studied because of its high photocatalytic activity, chemical stability, low prices and application. In this thesis, tetrabutyl titanate as the titanium source, ethanol as solvent, acetic acid inhibitor, titanium dioxide nanocrystalline photocatalysts were prepared by sol - gel method. Studied the TiO 2 sample the phase transition during calcination ScS calcination temperature and calcination time on the nano the TiO 2 of the crystal form, particle size, specific surface area and catalytic activity the impact from the catalytic efficiency considerations, identified the the anatase TiO 2 nano-crystal preparation conditions. Order to further improve the photocatalytic activity of nano-titanium dioxide doped with metal ions, in-depth analysis of TiO 2 nanocrystalline photocatalytic mechanism based on the modification of nano-titanium dioxide photocatalyst. Selected transition metal Fe as a dopant, the sol - gel method iron ion-doped nano-titanium dioxide photocatalyst. By changing the amount of iron doping, the calcination temperature and calcination time to study the influence of these conditions change on the product crystal, morphology and catalytic properties, determine the optimal doping ratio and calcination temperature of the metal ion doping on the influence mechanism of photocatalytic activity of titania nanocrystals. TiO 2 nanocrystals in addition to its crystal structure and grain size have a significant impact on the photocatalytic activity of the sample morphology and microstructure are also greatly affected. In this study, Template synthesis of nano the TiO 2 hollow ball, and study its photocatalytic activity. The spherical of Caco 3 nano-particles as a template, titanium sulfate as a precursor synthesized by the sol - precipitation the CaCO 3 / hydrated TiO 2 nuclear - shell structure composite nanoparticles, to dissolve CaCO with the dilute HNO 3 solution 3 template successfully obtained the TiO 2 hollow ball. Synthesized TiO 2 nano hollow sphere samples at 400 ℃ into anatase with high specific surface area, good dispersion suspension, Rhodamine B and UV irradiation conditions degradation than the P25-TiO 2 (commercial the TiO 2 Photocatalyst) showed a higher photocatalytic activity.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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