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Study on Synthesis of TiO2-SiO2/rectorite Nanocomposite and Its Application in Purifying Wastewater

Author: ShaoShuai
Tutor: FangJiMin；YangHongGang
School: Wuhan University of Technology
Course: Environmental Engineering
Keywords: Titanium dioxide Silica Rectorite Sol - gel method . Methylene blue Copper ions
CLC: X703.5
Type: Master's thesis
Year: 2005
Downloads: 280
Quote: 0
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Abstract


Photocatalytic oxidation technology is a state-of-the-art water treatment technology has the advantages of high efficiency, low energy consumption, process equipment is simple, easy to control operating conditions, no secondary pollution, which is a promising water treatment technologies. Low quantum efficiency and recycling difficult shortcomings limit its industrialization promotion applications but the photocatalyst TiO 2 is a typical representative of the traditional methods, scholars began in earnest in this aspects of systems research, including the TiO 2 catalyst surface modification, immobilization of heavy metals deposition, compound semiconductor, doped with rare earth elements and other technologies. For TiO 2 photocatalyst use the above shortcomings, the massive research TiO 2 -SiO 2 / rectorite nano composite photocatalyst material preparation conditions and its photocatalytic degradation of organic dye methylene blue adsorption the copper ions general law, to further enrich the photocatalyst load modification technology and its application in wastewater treatment research. In this study, the sol - gel method to SiO 2 for modifier rectorite carrier, prepared for the first time a massive TiO 2 -SiO 2 / rectorite the photocatalytic nanocomposite material and tired of the the rectorite pulp density, titanium soil than (Ti / R), silicon titanium ratio, pH value, complex reaction temperature, calcination temperature The photocatalytic activity of the product and the initial mechanism where. By orthogonal experiment to determine the order of the four main factors that affect the product photocatalytic properties of primary and secondary: calcination temperature gt; the Ti / R gt; the composite reaction temperature gt; calcination time. The best preparation conditions: calcination temperature of 600 ° C the Ti / R = 10 mmol / g, the composite reaction temperature 60 ° C, calcination time 2h. In this study, the use of X-ray diffraction (XRD), transmission electron microscopy (TEM), infrared spectroscopy (IR), specific surface area measurements (BET method) means on the prepared samples were characterized to analyze the microstructure of the material morphology interface characteristics . The test results show that: the degree of crystallinity of the composite material is not high, but obvious the anatase TiO 2 , and its particles are fixed by the Ti-O-Si bond in the surface of the rectorite, particle size distribution more uniform These are materials light, with an average particle size between 25-30nm, rectorite structure has been a marked change of the specific surface area of ??the sample tired than raw rectorite and pure TiO 2 are increased many the main reason for the enhanced catalytic activity. In order to evaluate the photocatalytic properties of the prepared composite photocatalyst material to the UV lamp as a light source, homemade analog reaction device with analog pollutants methylene blue photocatalytic degradation test, and to further explore the amount of catalyst, reaction time, initial concentration, pH, light distance, repeated use of different conditions on the photocatalytic properties of materials were investigated and preliminary mechanism. The test results show that: 8mg / L methylene blue solution for the initial concentration, when the amount of catalyst to 5g / L, UV degradation 3h, decolorization rate of 90% or more; alkaline conditions favor the reaction proceeds, the distance light best; repeated 4 times after the material still has more than 70% of the bleaching effect of methylene blue degradation effect is 20cm. This topic also prepared composite analog wastewater containing copper assay. Through research and analysis of the test results of the single factor, the resulting composite Cu 2 adsorption conditions: pH value of 8 or so, the amount of material 18g / L solution first test concentration of 5 mg / L, stirring 15min, at room temperature 25 ℃. Its removal rate could reach 92.5%.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization > Additives
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