The Study Of Synthesis And Doping Of Nanoγ-Fe₂O₃

Because of the outstanding magnetic properties, chemical stability and biocompatibility,γ-Fe2O3 is an important functional material and widely used in the field of magnetic fluid, biological processes and information storage.γ-Fe2O3 doping with rare earth ion(Co2+, Dy3+) shows both the nature of the nano magnetic materials and the nature of the metal ions which make it more widely used. Magneticγ-Fe2O3@CS possesses the characteristics of absorption of radioactive metal ions which makes it more effective when dealing with a variety of pollution of water bodies.In this paper, y-Fe2O3 andγ-Fe2O3 doping with rare earth ion (Co2+, Dy3+) is synthesized by the sol-gel method and coprecipitation method. y-Fe2O3@CS particles are successfully synthesized through dispersedγ-Fe2O3 particles.Firstly, the sol-gel method was selected to prepare pureγ-Fe2O3 at 50℃, using FeNO3-9H2O as iron source, ethylene glycol as solvent. The reacting factors, such as reacting time, the concentration of iron source and surfactant were studied. Based the reaction, y-Fe2O3 particles doping with rare earth ion(Co+, Dy+)are synthesized, the morphology and properties of production are characterized and discussed.Secondly, pure y-Fe2O3 was prepared by the coprecipitation method at 80℃, using FeSO4·7H2O as iron source, NaOH as precipitant. The reacting factors, such as reacting time, the concentration of iron source and surfactant, especially the effect of NaNO3, were studied. Based the reaction, y-Fe2O3 particles doping with rare earth ion(Co2+, Dy3+)are synthesized, the morphology and properties of production are characterized and discussed. In this paper, a brief discussion of the magnetic fluid retention in vitro was disscussed. The fluorescence ofγ-Fe2O3 particles doping with rare earth ion (Co2+, Dy3+) was discussed and characterized which showed a good luminescence property. The luminescence property will play an important role in biomarkers application, especially in fluorescence labeling applications with a very broad application prospects.Finally, y-Fe2O3@CS particles were prepared by mechanical and magnetic stirring withγ-Fe2O3 particles as core, using liquid paraffin and Span-80 as solvent. Effects of pH, the initial concentrations and reaction time were investigated. The results show that the adsorption properties and the effect ofγ-Fe2O3@CS toward Cu2+and Cd2+were good.