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Preliminary study on Preparation and photocatalytic properties of magnetic composite materials of Fe_3O_4/Cu_2O/RGO

Author: ZhangWen
Tutor: JiangZuo
School: Nanjing University of Technology and Engineering
Course: Materials Science
Keywords: Magnetic composite photocatalyst Graphene Cu2O Photocatalyticdegradation
CLC: TQ426
Type: Master's thesis
Year: 2013
Downloads: 153
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Abstract


As an emerging environment-purifying technique, the semiconductor photocatalysis degradation technology is paid more attention in waste water treatment, especially in the treatment of wastewater containing organic compounds which are dirricult to destroy. Aiming at disadvantages of semiconductor photocatalytic nanoparticals, such as difficulty in separation and low using rate of catalyst utilization in the condition of visible light, it is successful to prepare the magnetic photocatalytic composites with wisible light response mechanism in this paper. The contents are described as follows:First, the graphene sheets were obtained using hydrazine hydrate as a reducing agentby liquid phase reduction method. Then Fe3O4/RGO and Cu2O/RGO were two kinds of grapheme-based composite materials which were also synthesized by a solvothermal method via in situ growth. Experiments with ethylene glycol as a solvent, and the composites were characterized by TEM, SEM, XRD, FTIR and so on. And analysis of different factors such as the reaction temperature, reation time and surfactant agent were impact on products. We ultimately obtain the optimum reaction parameters.Secondly, Fe3O4nanoparticles deposited on graphene sheets by electrostatic attraction with mechanical stirring. By using this way, we have successfully obtained FeO4/Cu2O/RGO magnetic photocatalyst composites. The synthesized products were characterized by TEM, XRD, VSM and so on. The results showed that Fe3O4and Cu2O which were two different morphologies nanopraticles were both cubic crystal form and the particle size were about200nm. The composite saturation magnetization is32.8emu/g.Finally, using500w xenon as the UV-visible light source, the contaminants degradation efficiency in methyl orange and nitrophenol solution as target pollutants was investigated the photocatalytic activity of Fe3O4Cu2O/RGO magnetic photocatalytic composites. The results showed that the methyl orange degradation efficiency can reach99%when the photocatalytic reaction is for25min and the degradation efficiency is50%when the photocatalyst is resued three times. But the degradation efficiency of the nitrophenol is29%and it is lower than methyl orange. This composite photocatalyst is both producing photocatalytic reaction under the visible light but also separating form the waste water with the external magnetic field because of magnetic properties.

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CLC: > Industrial Technology > Chemical Industry > Reagents and the production of pure chemicals > Catalyst ( catalyst )
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