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Preparation of Nanometer Titanium Dioxide Doped by Iron and the Study of Photocatalytic Performance

Author: LiDeSong
Tutor: YangWei；HuangQiaoSong
School: China University of Petroleum
Course: Materials Physics and Chemistry
Keywords: Titanium dioxide Iron-doped Photocatalytic properties Degradation rate Methylene blue
CLC: O484
Type: Master's thesis
Year: 2008
Downloads: 539
Quote: 2
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Abstract


The titanium dioxide is one of the most promising photocatalytic material , has the advantages of high catalytic performance , good stability , non-toxic and inexpensive compared with other semiconductor materials . Titania as a photocatalyst material obviously there are two shortcomings : Titanium dioxide is a wide band gap semiconductor , only smaller wavelength UV absorption of solar energy utilization is low ; photoinduced electrons and photogenerated holes easily composites , and photo-generated carriers . The quantum efficiency is low . Photocatalytic study , the experimental titanium dioxide the iron doping modification expectations can improve the activity of titanium dioxide photocatalyst to expand its range of visible light response , and improve the utilization of the catalytic light source . In this paper, Fe 2 O 3 < / sub > doped with impurities , prepared by high energy ball milling the the pure nano titanium dioxide and doped iron ions ( Fe 3 < / sup > ) nano titanium dioxide powder , degradation products of methylene blue as a target , the use of UV - visible spectrophotometer analysis of titanium dioxide spectral absorbance of the solution and methylene blue . The results show that the iron doped titania red shift of the absorption edge of the spectrum , the absorption edge of the doped samples redshift with undoped sample moved than 20nm, is conducive to the absorption of visible light ; moderate doped miscellaneous can significantly improve the photocatalytic properties of titanium dioxide , iron ion doping amount of the experimental ( the Fe 3 < / sup> : the TiO 2 mass ratio ): 0.1% photocatalytic degradation rate increased by nearly 20% compared with the undoped samples . Also different calcination temperature of the titanium dioxide spectra and the degradation of methylene blue solution , the results show a the temperature on the titania spectral absorption edge and the degradation rate of the methylene blue solution greater impact, the spectral absorption of the experimental side maximum 500 ℃ , and the degradation rate of max. The experimental study methylene blue initial concentration as well as the amount of titanium dioxide on the photocatalytic degradation of methylene blue solution , the results show that when the initial concentration of 12mg / L, put the amount of 0.8g / L , the degradation effect better.

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CLC: > Mathematical sciences and chemical > Physics > Solid State Physics > Thin Film Physics
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