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Study of Photocatalytic Activity of Visible Light Response TiO2 Nanoparticles

Author: SongNingNing
Tutor: TanXin
School: Tianjin University
Course: Chemical Engineering
Keywords: Photocatalyst TiO2 Nitrogen Cerium Visible-Light irriadiation
CLC: TQ426.81
Type: Master's thesis
Year: 2009
Downloads: 52
Quote: 0
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Abstract


Titanium dioxide exhibits unique photo-functionalities that make it an excellent choice for photocatalytic applications in environmental protection, hydrogen production and energy fields due to TiO2 is a highly effective, saving energy, without any further polluted and low cost photocatalyst. However many applications have been limited by its large band gap （3.2eV） which can only capture less than 3% of the solar irradiance （wavelength < 387nm）, and the fast recombination of photogenerated electron-hole pairs both on the surface and in the lattice of TiO2. So, the current issue is how to improve its efficiency under sunlight irradiation by structure modification.The modified TiO2 photocatalyst doped with nitrogen and/or cerium were synthesized in this paper. By comparing their photocatalytic activity, crystal structure and chemical state characterization, the mechanism of doped nitrogen and/or cerium elements on photocatalytic activity of nitrogen and/or cerium doped TiO2 have been discussed.The nitrogen with/without cerium co-doped TiO2 nanoparticles were synthesized via Sol-gel technique. Photocatalysts were characterized by TEM, XPS, XRD, BET, and DRS. By the KI photocatalytic oxidation experiments under different wavelengths irradiation were carried out and their catalytic efficiency were studied. From the current results we could concluded: the optimal doped ratio is 0.97 at.% nitrogen for nitrogen doped TiO2, and 0.70 at.% cerium and 0.33 at.% nitrogen for nitrogen and cerium co-doped TiO2. Doping nitrogen and its chemical state in TiO2 nanocrystal are the important impact factors on the photocatalytic activity of nitrogen with/without cerium co-doped TiO2 nanoparticles. The special role of cerium as a variable valence element is another factor on the photocatalytic activity of nitrogen and cerium co-doped TiO2.

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CLC: > Industrial Technology > Chemical Industry > Reagents and the production of pure chemicals > Catalyst ( catalyst ) > Metal catalysts > Single - metal catalysts
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