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Optimized Preparation of MWCNTs/TiO2 Composite Photocatalyts and Its Applications for Degradation

Author: ZhangZuo
Tutor: ShiZhou
School: Hunan University
Course: Municipal Engineering
Keywords: Composite photocatalyst Multi-walled carbon nanotubes Nano-TiO2 Photocatalytic Activity Methyl orange
CLC: O643.36
Type: Master's thesis
Year: 2010
Downloads: 152
Quote: 1
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Abstract


In this paper from the preparation process, carbon nanotubes and nano-TiO2 modified by doping three aspects MWCNTs/TiO2 prepared composite photocatalyst optimization studies, through its analog pollutant photocatalytic degradation of methyl orange to study the effect of effects of different process parameters and the modified conditions on the catalytic activity, and to elect the highest catalytic activity preparation and modification methods, and ultimately applied to 1,2,4 - trichlorobenzene photocatalytic degradation. Methyl orange as model pollutant by examining the different preparation conditions, the catalytic activity of the composite photocatalyst difference, compared to filter out the sol - gel method optimal preparation process parameters: calcination temperature 500 ℃, calcination time 3h, Sol system pH 3, fixing agent sodium polystyrene sulfonate dosage 5g / L, dosage of TiO2 nanotube mass of 1.5%. Using microwave irradiation, air calcination oxidation, nitric oxide and nitric acid oxidation method associated with the usage of air calcination carried out on multi-walled carbon nanotubes modified by and study examines different MWNTs tube length, diameter structure and Different Modification Methods on the catalytic activity of the composite photocatalyst, the results show that the catalytic activity of the composite photocatalyst with diameters larger carbon nanotubes and the tube length becomes longer and gradually increase; microwave irradiation and nitric oxide calcined with air combined with two kinds of modification methods to improve the catalytic activity of the composite photocatalyst larger role, in which the carrier gas N2 under microwave irradiation power 700W modified carbon nanotube composite photocatalyst prepared highest catalytic activity. Transition metal ion doped TiO2 experimental studies have shown, Fe3, Cr3 and Zr4 three kinds of ion doping on composite photocatalyst photocatalytic activity have a certain role in promoting improved; which Fe3 best, Cr3 second, and Zr4 little effect on the catalytic activity increased. Application of high catalytic activity prepared composite photocatalyst photocatalytic degradation of 1,2,4 - trichlorobenzene experiments show that compared with ordinary nanometer TiO2 photocatalyst composite photocatalyst has a higher photocatalytic degradation. In short, optimized high catalytic activity prepared composite photocatalyst will complement traditional semiconductor photocatalytic oxidation catalyst in the presence of defects, for the treatment of organic pollutants in chlorobenzene and other persistent organic pollutants has caused environmental pollution potential applications .

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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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