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Study on Preparation and Photocatalytic Activity of Pb2+ Doped Silica-Titanium Composite Catalysts

Author: LvYaZhou
Tutor: QiuZuMin
School: Nanchang University
Course: Industrial Catalysis
Keywords: Photocatalyst Degradation Titanium dioxide Methyl orange
CLC: O643.36
Type: Master's thesis
Year: 2011
Downloads: 24
Quote: 0
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Abstract


With the continuous development of modern industry, the number and variety of organic matter into the waters through a variety of channels increased dramatically with the complexity and diversity of these organics, interested in the water causing serious pollution to the environment, which is toxic and refractory organic wastewater pollution serious. TiO2 on many environmental pollutants significantly photocatalytic degradation, make it come out that industrial applications (such as photocatalysis, adsorption, molecular sieves, ion exchange separation, etc.) the preferred Photocatalytic has developed into a new type of environmental pollution control technology. However, a wide band gap of TiO2 photocatalytic material (anatase of 3.2 eV) only under ultraviolet light catalytic activity, can not take full advantage of the sunlight, limiting its business prospects. Doping modification of TiO2 photocatalytic technology as the core, to become a catalyst for visible light excitation and improve the photocatalytic activity of TiO2 photocatalytic most important research topics. This article focused on Pb2 doped silicon titanium compound catalyst preparation, characterization, and catalytic activity, and Pb2-Si02-TiO2 photocatalytic degradation kinetics of methyl orange to carry out the following work: (1) study with positive ethyl silicate (TEOS) as the silicon source, the titanium source for the tetrabutyl titanate (TBOT), lead nitrate (Pb (NO3) 2) as raw materials, cetyl trimethyl ammonium bromide (CTAB) as template agent, the sol - gel synthesis of Pb2 doped silicon titanium composite. Investigated Pb2 doping and calcination temperature on the photocatalytic activity in the preparation process, to determine the best preparation conditions in the composite catalyst under simulated sunlight. X-ray powder diffraction (XRD), infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and UV-visible absorption spectroscopy (UV-Vis) and other analytical tools were used to characterize the optical performance and product structure. The results show that: greatly improved the photocatalytic activity of TiO2 particles mixed with the right amount of Pb2 able to make Pb2 doped anatase to rutile transition temperature to high temperature, and refined grains experimental The doping concentration 100:1.5 (TiO2/Pb mole percent), the best heat treatment temperature of 500 ° C. (2) under simulated sunlight photocatalytic degradation of methyl orange solution as a probe reaction in doping of silicon titanium composite photocatalytic activity of Pb2 evaluation study of the amount of catalyst, initial pH value H202 added amount of catalyst performance. The results show that: at pH = 4, the amount of catalyst was 3.0g / L, the H2O2 dosage to 3 mL / L 3h reaction time, concentration of 10mg / L methyl orange solution decolorization rate was 90.00%. Can be seen: of CODcr removal rate effect is not very obvious, Si02 alone doped Ti02 More significantly improved performance compared to single doped photocatalytic Pb2 Pb2-Si02-Ti02 catalytic performance in the comparative experiments. Visible, appropriate Pb2 and SiO2 doped changed significantly improve the performance of photocatalytic properties of TiO2 photocatalyst. In addition, with the increase in the number of catalyst, the degradation rate of methyl orange gradually reduced, repeated three times before use, Pb2-Si02-Ti02 catalyst performance degradation is not obvious, the decolorization rate of 90.66% becomes 87.23% 82.3% drop; then continue to use the the Pb2-SiO2-TiO2 catalyst catalytic properties change, degradation poorly. (3) organic photodegradation kinetics and mechanism of photocatalytic reaction process in a more complex problem. Reaction kinetics of concentration were 5.0mg / L, 10.0mg / L, 15.0mg / L and 20.Omg / L methyl orange solution of Pb2-SiO2-TiO2 photocatalytic degradation of methyl orange, preliminary discussed. The higher the concentration of methyl orange, and the same time the greater the degradation rate; the higher the concentration of methyl orange, and the effect of degradation of the large amount of catalyst used preferably. Reactions are in line with the Langmuir-Hinshelwood kinetics equation, and the apparent first-order reaction.

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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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