Fabrication Of Magnetic Nanocomposite Materials And Their Excellent Catalytic And Absorbing Performance

With the development of industry, environmental pollution and energy shortage problems have become more and more serious. Therefore, seeking for the new clean energy and the effective methods to harness environmental pollution has been attracting a great deal of attention. In recent years, nanoparticles have aroused considerable interest because of their excellent catalytic activity for various chemical, such as the reduction of nitroarenes and organic dyes. The integration of catalytic and magnetic characteritics will facilitate the recyclability of catalysts.In this paper, a one-step method was developed to fabricate Bi nanoparticles. Bi nanoparticles with different sizes and dispersity were obtained by control the type and amount of the dispersants. The as-prepared Bi nanoparticles were characterized by Fourier Transform infrared spectroscopy, transmission electron microscopy, energy-dispersive X-ray, and powder X-ray diffraction. The results show that soluble starch is better than PVP in stabilizing Bi nanoparticles. Meanwhile, it was unexpectedly found that the Bi nanoparticles exhibit good catalytic performance for the reduction of 4-nitrophenol and organic dyes pollutants.Hydrothermal method was used to fabricate NiFe2O4/RGO nanocomposites. The NiFe2O4 nanoparticles with different sizes and shapes were obtained by selecting solvents and changing the amount of the reactants. The experimental results show that the NiFe2O4/RGO is a good adsorbent for the organic dyes and it can be easily recovered from the reaction system and re-used because of its magnetic properties. The CuFe2O4/RGO nanocomposites were synthesized by the same approach, and they exhibited high catalytic activity towards the hydrolytic dehydrogenation of NaBH4.