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Study on Preparation, Structure and Properties of Doped TiO2 under Visible Light Irradiation

Author: SiZhiChun
Tutor: XiaoQi
School: Central South University
Course: Mineral materials science
Keywords: Doped TiO2 Visible light irradiation Photocatalytic activity
CLC: O482.3
Type: Master's thesis
Year: 2007
Downloads: 11
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Abstract


Effective utilization of solar energy to solve pollution problems has attracted much attention by many researchers because of wordwide environment pollution and energy crisis. TiO2-based photocatalytic oxidation technology has wide application in waste water treatment due to its high oxidation ability, chemical stability and nontoxic. However, high recombination rate of photogenerated electron-hole pairs on the surface of TiO2 and poor absorption to visible light hinder the commercialization of this technology. It is desirable to develop a photocatalyst that efficiently absorbs visible light, which occupies the main part of the solar spectrum.C doped TiO2 has been prepared by low temperature combustion synthesis method in this work. It is shown that visible light absorption ability of TiO2 is enhanced by C doping. And C doped TiO2 after calcination at 600℃shows the highest photocatalytic activity. The maximum decomposition rate of MB reaches 52.6% over C doped TiO2 under visible light irradiation for 120min. Mechanism of MB degradation over C doped TiO2 under visible light irradiation is a combined action of self-sensitized oxidation mechanism and photogenerated electron-hole oxidation mechanism.C/Sm codoped TiO2 is synthesized by low temperature combustion method. The result indicates that high visible light absorption of TiO2 is obtained by C doping. And specific surface area, generation rate of photogenerated hydroxide radicals and efficiency of the charge separation are increased by samarium doping. The synergistic effect of C/Sm codoping makes the high photocatalytic activity of TiO2 under visible light irradiation. The maximum decomposition rate of MB reaches 66.2% over C/Sm codoped TiO2 under visible light irradiation for 120min. The higher formation rate of hydroxide radical leads to the higher photocatalytic activity of C/Sm codoped TiO2.Preliminary study on photocatalytic activity of C/Sm codoped TiO2 under sun light irradiation is presented in this work. The optimal process conditions of photocatalysis for MB decomposition are as follows: the calcinations temperature is 600℃, Sm content is 0.2～0.5mol%, the concentration of TiO2 is 1.0mg/L, the concentration of MB is lower than 20mg/L, and pH value is higher than 7.

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CLC: > Mathematical sciences and chemical > Physics > Solid State Physics > Solid nature of the > Optical Properties
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