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Studies on Preparation and Photocatalytic Activity of Titania-coated Magnetite Photocatalysts

Author: BaoShuJuan
Tutor: ZhangXiaoGang
School: Xinjiang University
Course: Physical and chemical
Keywords: Preparation of catalyst Composite photocatalyst Performance of Magnetic carrier Decolorization Performance Methylene blue Industrial wastewater discharge A solid-liquid separation Reduction Printing and dyeing industry wastewater
CLC: O643.3
Type: Master's thesis
Year: 2003
Downloads: 320
Quote: 4
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Abstract


Since the 1990s, China's gross domestic product (GDP) growth of 9% to 11% of high-speed, environmental pollution has not yet been basic control, but was the trend. Printing and dyeing industry, industrial wastewater discharge large, according to incomplete statistics, the domestic printing and dyeing enterprises emissions for about 300 to 400m of 3 / d, the high levels of organic pollutants in water, color and high alkaline changes in water quality. Are subject to different degrees of pollution due to the discharge of sewage, making China's major rivers, and there is an increasing trend. Currently, printing and dyeing industry wastewater governance issues, has become a major problem in today's world environment of the scientific community need to be resolved. For the above problems, at home and abroad in recent years in this area a lot of research, and have achieved success in many ways, especially in the photochemical party made a breakthrough, which TiO 2 / UV technology as the representative of photocatalytic oxidation technology has become a hot research today. TiO 2 photocatalytic technology can be very effective treatment difficult to deal with some conventional methods of organic wastewater, eliminate the secondary pollution, reduce operating costs. This is to solve the serious problem of environmental pollution is undoubtedly a boon. The combination of magnetic material and TiO 2 , assembled into the magnetic carrier TiO 2 light catalyst, so that it not only has a good photocatalytic activity, also taking advantage of the quick and convenient magnetic field recycling of its practical applications become possible. This organic dye degradation object, a series of studies, mainly from the following three aspects. 1. Reduction technique for preparing magnetic substrate (Fe 3 O 4 ), to the sol - gel method the TiO 2 / Fe 3 O 4 magnetic carrier Photocatalyst and used for photocatalytic degradation of Orange - II evaluation of its activity. The results show that, TiO 2 / Fe 3 O 4 photocatalyst in the first use of the degradation rate the pure TiO of 2 < / sub> is similar to the use of the three cycles to maintain a higher catalytic activity. The optimum amount of catalyst to 4 g / L, able to maintain good catalytic activity in acidic and alkaline environment. 2. (1) the use of chemical co-precipitation prepared magnetic substrate (the Fe 3 O 4 ). a) high-temperature calcination Fe 3 O 4 to make it transformed into γ-Fe 2 O 3 , with a two-step Law coated SiO 2 get SiO 2 / γ-Fe 2 O 3 magnetic carrier; b) with polyethylene glycol (PEG), sodium dodecyl sulfate (SDS) to improve the Fe 3 the O 4 of the dispersion, the surface coated SiO 2 , the SiO 2 / Fe 3 O 4 magnetic carrier. (2) prepared by solid magnetic carrier Ni 0.5 Fe 2.5 O 4 , coated with solid state reaction method the SiO 2 < / sub>, obtained SiO 2 / Ni ( 0.5 F e 2.5 O 4 magnetic carrier. magnetic carriers modified by the above method, the use of sol - gel method easy to solid-liquid separation and recovery of the magnetic board TIO photocatalyst XPS, Xrp, EDX, TEM, IR and UV-VIS; g means to characterize the samples studied catalysts on soluble dye Orange-11 and methylene blue degradation of performance, and explore like burning temperature and time on the catalytic activity results showed that the optimum calcination temperature of 450 ° C, optimal calcination time for 30min. Fe O and TiO between coated amorphous SIOZ, can greatly improve the adsorption capacity of the catalyst (3) by chemical doping, sol-gel method is easy to solid-liquid separation and recovery of magnetic sets the WO3-TIOZ composite photocatalyst. use IR, XJtD and SEM samples were characterized to study the performance of the catalyst solution of methylene blue decolorization results showed that, the knife olWO3-TIOZ composite photocatalyst The highest catalytic activity, after three cycles decolorization rate is still maintained at more than 98% (2) photocatalytic reduction and photochemical deposition in TiO / silver deposited on the surface, the magnetic carrier the Ag-TIOZ composite photocatalyst, by m, XRD, SEM and EDX bar products were characterized catalyst industry methylene blue solution bleaching performance results show that the, Ag appropriate amount of doping magnetic set out the Ag-TIOZ composite light catalytic activity improved, doping amount exceeds a certain limit but to make magnetic carrier TIOZ light catalyst activity decreased in the presence of EDTA medium, light catalytic reduction prepared Ag TIO the composite photocatalyst activity was significantly superior to other methods of preparation of Ag-TO. composite photocatalyst.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic
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