Synthesis And Superparamagnetic/Copper And Lead Ion Adsorption Properties Of Lanthanide Ion Doped Magnetite Nanomaterials

Since the sixties of last century,the research of nanotechnology and nanomaterials has made unprecedented progress,and it has been widely used in various fields because of its unique properties.Among them,magnetite nanoparticles have a good application prospect of biomedical and environmental remediation fields because of their excellent superparamagnetic properties?high saturation magnetization,low remanence and low coercivity,etc.?.Firstly,this paper introduces the research background and research status of magnetic nanomaterials.At present,the superparamagnetic of magnetite nanoparticles is still faced with some problems,such as high remanence,high coercivity and so on.These factors restrict the application of magnetite nanoparticles in biomedical and environmental remediation fields.Under this background,this topic has carried out a series of studies on how to improve the superparamagnetism of magnetite,M_xFe_3-xO₄?M=Sm,Eu,Gd,Tb,Dy,Ho,Tm?magnetite nanoparticles doped with different lanthanide ions was successfully synthesized by solvothermal method of simple operation and fast cycle.X-ray diffractometer?XRD?,Fourier transform infrared spectrometer?FTIR?,scanning electron microscope?SEM?,transmission electron microscope?TEM?,X-ray photoelectron spectrometer?XPS?and vibrating sample magnetometer?VSM?were used to analyzes the structure of magnetic materials.The effects of phase,crystal structure,surface composition,morphology and doping ion concentration on the magnetic properties of the synthesized magnetite nanoparticles were systematically characterized,and the results were analyzed in detail.Superparamagnetic magnetite nanoparticles with remanence of 0.017 emu/g and coercivity of 8.2 Oe were obtained.Compared with other literatures,the remanence shows a decrease of an order for magnitude,and the coercivity is also greatly reduced compared with other people's work.In addition,the samples were also subjected to heavy metal copper ion and lead ion adsorption studies to expand the application range of magnetite.The significance of this work is to change the structure of magnetite by doping lanthanide ions into magnetite,and then improve the magnetic properties of magnetite nanomaterials.After a series of preparation experiments and data analysis and discussion,the research group has an in-depth understanding of magnetite,which lays a foundation for the further study of magnetite nanoparticles in the future.