四氧化三铁有关性质（Properties of magnetite）.docVIP

四氧化三铁有关性质（Properties of magnetite） Fe3O4 magnetic micro nano composite materials by liquid phase synthesis, characterization and Performance Studies No [Abstract]: magnetic micro nano materials in the physical and chemical characteristics such as special properties different from conventional materials and wide attention. Has the important significance of magnetic development with unique structure and composition of the micro nano material and application. However, magnetic micro nano materials tend to aggregate, surface functional groups, these shortcomings make it difficult to satisfy more applications. The magnetic micro nano composite materials can overcome these shortcomings, so it has become the hotspot in the field of materials. This paper studied the preparation of Fe3O4 micro nano composite materials, synthesis of Fe_3O_4@SiO_2, Fe_3O_4@SiO_2-Ag, Fe_3O_4@SiO_2@PbS and other Fe3O4 micro nano composites, and studied their formation mechanism and its application in ion adsorption, pollutant monitoring etc.. The main research work can be summarized as follows: 1, the hydrothermal synthesis of Fe3O4 microspheres as matrix, using the hydrolysis of sodium silicate, Fe_3O_4 @SiO_2 magnetic composite material at 80 DEG C. By inductively coupled plasma atomic emission spectrometer and spectrophotometer, a detailed study of the adsorption ability of the composites to heavy metal ions, and found that it had good adsorption properties of lead ions and mercury ions. At the same time because the materials are magnetic, can be easily separated from the solution, so it has good application value. 2, the use of Fe3O4 microspheres and TEOS as raw materials, Fe_3O_4@SiO_2 composite material at room temperature. And on this basis, Fe_3O_4@SiO_2-Ag three composite materials were synthesized by using silver mirror reaction principle. In detail it was characterized by XRD, SEM, TEM and EDX, the results show that the composite material layer is coated with a layer of uniform distri