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Nitrogen- doped photocatalyst K2Ti4O9 Synthesis and Photocatalytic Performance

Author: GaoBiao
Tutor: WeiZiDong
School: Chongqing University
Course: Chemical Engineering and Technology
Keywords: K2Ti4O9 Tetratitanate Nitrogen-doped Urea Photocatalyst Photoelectrocatalysis
CLC: O643.36
Type: Master's thesis
Year: 2010
Downloads: 71
Quote: 0
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Abstract


In recent years, photochemical, photocatalytic and catalytic chemistry chemistry has become the most active areas of research. Especially in the field of photocatalysis using semiconductor photocatalysts to convert light into electrical or chemical energy has become one of the hottest areas of research. Along with the semiconductor photocatalyst research, layered structure related compounds also attracted widespread attention. Research shows that layered compounds such as catalysis in photocatalysis has great potential applications. The titanium potassium titanate is a typical semiconductor-type layered metal compound as photolysis of water photocatalytic material, studies have been reported. In this study, we will K2CO3 and TiO2 by high temperature solid phase reaction of four potassium titanate (K 2 Ti 4 O 9 ), four potassium titanate obtained by acidification tetratitanate (H 2 Ti 4 O 9 ). Using high-temperature solid-state reaction, urea as a nitrogen source, respectively four potassium titanate (K 2 Ti 4 O 9 ) and four titanate ( H 2 Ti 4 O 9 ) doped with nitrogen, the reaction of nitrogen-doped K 2 Ti < sub> 4 O 9 and H 2 Ti 4 O 9 . X-ray diffraction (XRD), infrared spectroscopy (IR), ultraviolet-visible diffuse reflectance spectroscopy (UV-DRs) and other methods to characterize the structure of the material. X-ray diffraction results show that the four potassium and urea reaction of titanium interlayer spacing increased, UV-visible diffuse reflectance spectroscopy (UV-DRs) results show that the nitrogen-doped catalysts visible wavelengths of light absorption capability significantly enhanced by infrared spectroscopy (IR) After the discovery of nitrogen-doped, N potassium titanate skeleton indeed occurred chemistry. The use of self-designed reactors, research catalysts doped with nitrogen analogue of methylene blue dye wastewater treatment, and achieved good removal. The effects of different nitrogen doping temperature on K 2 Ti 4 O 9 in the ultraviolet and visible wavelengths catalytic activity, but also The effects of nitrogen-doped nitrogen-doped or not washed prior to catalytic activity and, through its methylene blue photocatalytic degradation of the photocatalytic performance changes by ultraviolet-visible diffuse reflectance spectroscopy (UV-DRs) characterized different temperatures of nitrogen-doped catalyst sample absorbance capacity changes. The prepared four nitrogen-doped titanate (NK 2 Ti 4 O 9 ) as catalyst made of thin-film photovoltaic catalytic electrode, by degrading methylene blue to test the catalytic activity of the catalyst in the photoelectric catalysis potential applications. The results showed that: surname calcination temperature on nitrogen-doped N-doped also has considerable significance doped catalysts at different temperatures distinctly different colors, light absorption and photocatalytic activity differ significantly: Nitrogen-doped catalysts yellow, for visible wavelengths absorption capacity significantly enhanced; N-doped titanate visible light activity stronger than the corresponding four titanate. NK 2 Ti 4 O 9 thin-film photovoltaic catalytic degradation of methylene blue significantly higher than the efficiency of photocatalytic degradation efficiency. Compared with photocatalysis, NK 2 Ti 4 O 9 thin-film photovoltaic catalyzed degradation of methylene blue is more thoroughly, not only the destruction of their hair color groups, and decompose its benzene ring conjugated system.

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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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