Fabrication And Properties Study Of Magnetic Nanocomposite Materials And Ordered Nanocomposite Materials

Graphene has attracted a great deal of attention because of its excellent physical and chemical properties.In addition,it has been used as supports of nanoparticles due to its large specific surface area.Thus,its potential applications include catalyst,sensors,supercapacitors,batteries,and so on.In recent years,there are plenty of organic pollutants which are toxic in industrial waste,for example 4-nitrophenol.Thus,the environmental problems are more and more serious.Moreover,the awareness of people is gradually increasing.Therefore,their attention has been drawn to solve the water contamination effectively and easily.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.Magnetic nanocomposite materials can play an important role in water treatment including catalytic degradation of organics.Its obvious advantage lies in recycling and cost reduction.Here,Bi-Fe₃O₄@RGO are prepared to catalyze reduction of 4-nitrophenol.In this paper,a facile route to synthesize Bi-Fe₃O₄@RGO nanocomposite was demonstrated.Reduced graphene oxide was used as a supporter to improve the dispersibility of Fe₃O₄ nanoparticles and soluble starch was used as dispersant to prevent aggregation of Bi nanoparticles.The morphology,composition and crystal structure of the prepared Bi-Fe₃O₄@RGO nanocomposites 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 nanocomposites are determined with a vibrating sample magnetometer.The catalytic activity of the Bi-Fe₃O₄@RGO nanocomposites for the reduction of 4-nitrophenol is also studied.Bi-Fe₃O₄@RGO nanocomposites showed excellent catalytic performance for the reduction of 4-NP to 4-AP in aqueous medium at room temperature.The Bi-Fe₃O₄@RGO catalyst was magnetically recyclable and exhibited high catalytic activity for at least five cycles.All in all,the Bi-Fe₃O₄@RGO nanocomposites are easily synthesized,recyclable and cost effective and show great potential for catalytic reactions as catalysts.One-dimensional photonic crystals consist of alternating layers of high and low-refractive-index materials with planar interfaces between each pair of layers.As the simplest photonic structure,one-dimensional photonic crystals,whose simple preparing process and low cost,have attracted great attention in recent years.Therefore,in this paper,using the spin coating method prepared the polyvinylpyrrolidone/graphene oxide?PVP/GO?and the polymethyl-methacrylate/graphene oxide?PMMA/GO?one-dimensional photonic crystals.The optical properties of these materials is adjustable.The thickness,external stimuli obviously influence the optical properties of photonic crystals.