Fabrication And Application Of Magnetic Nanocomposites Materials

Magnetic nanocomposite is combination of unique superparamagenetism and other excellent properties. It has been widely used in fields such as military industry, information storage, biologic medicine and environmental protection. Currently, water environment suffer considerable damage due to rapid industry development. Magnetic nanocomposite materials can play an important role in water treatment including catalytic degradation of organics and adsorption of dyes. Its obvious advantage lies in recycling and cost reduction. Here, Ag/Cu@Fe₃O₄ and CuFe₂O₄/rGO are prepared to catalyze reduction of p- nitrophenol and adsorb methylene blue.?1? A facile and efficient approach is developed to synthesize Ag/Cu@Fe₃O₄ hybrid nanoparticles using L-Lysine as a linker. The morphology, composition and crystal structure of the prepared Ag/Cu@Fe₃O₄ hybrid nanoparticles are characterized by Fourier Transform infrared spectroscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy and powder X-ray diffraction. The magnetic properties of the nanoparticles are determined with a vibrating sample magnetometer. The catalytic activity of the Ag/Cu@Fe₃O₄ hybrid nanoparticles for the reduction of 4-nitrophenol is also studied. The Ag/Cu@Fe₃O₄ hybrid nanoparticles are efficient catalysts and can easily be recovered from the reaction system because of their magnetic properties. In addition the Ag/Cu@Fe₃O₄ catalyst had good reusability. This cost effective and recyclable catalyst provides a new material for the use in environmental protection applications.?2? Hydrothermal method is used to prepare ZnFe₂O₄/rGO magnetic nanocomposite. T=180?, t=6h, mixed solvent of water and ethylene glycol are proved to be optimal conditions for ZnFe₂O₄/rGO having excellent magnetism and dood dispersion. Moreover, the ZnFe₂O₄/rGO composites are efficient catalysts for the reduction of p- nitrophenol and can easily be recycled.?3? CuFe₂O₄/rGO magnetic nanocomposite with good disperation is prepared by hydrothermal method. Its morphology, composition, crystal structure and magnetic properties are characterized by Fourier Transform infrared spectroscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, powder X-ray diffraction and vibrating sample magnetometer. Its performance of adsorbing methylene blue and influence of different reaction conditions on adsorption are also discussed.