Method for preparing magnetic ferric oxide nano particles

Abstract

The invention discloses a preparation method for a magnetic iron oxide nanometer particle. The cleaned cellulose fibers are immersed in the 0.1-0.5mol / l ferric salt or ferrous salt solution; after the ferric ions in the ferric salt or ferrous salt solution are fully absorbed in the micro-pores of the cellulose fibers or on the surface of the cellulose fibers, the cellulose fibers are immersed in the 0.2-4mol / l NaOH solution; the ferric ions and the ferrous ions in the solution generate the ferric hydroxide precipitation or the ferrous hydroxide precipitation in the micro-pores of the cellulose fibers to constitute the cellulose composite fibers; the ferric oxide / cellulose composite fibers are obtained after the dehydration of the cellulose composite fibers; finally, the ferric oxide / cellulose composite fibers are ignited in the air atmosphere or the oxygen atmosphere at the temperature of 350-1000 Celsius system for 20-300 minutes, so that the magnetic iron oxide nanometer particles with high purity are obtained. The method has a simple operation and the low cost raw materials, the prepared iron oxide nanometer particles have the even diameter distribution with a certain magnetism.

Description

technical field [0001] The invention relates to a method for preparing magnetic iron oxide nanoparticles, which belongs to the field of inorganic non-metallic nanometer materials, and also belongs to the fields of physics and chemistry. technical background [0002] Because iron oxide nanoparticles are widely used in practice, there are many preparation methods for iron oxide nanoparticles, such as hydrothermal method, forced hydrolysis method, sol-gel method, solid phase method, microwave method, physical pulverization method, Mechanical ball milling method and so on. However, these methods have disadvantages such as complex process, harsh reaction conditions, and the particle size of the product cannot be controlled. The current industrial method for preparing iron oxide nanoparticles is to first prepare iron hydroxide precursor and then roast it at high temperature, but this method is difficult to prepare small-sized nanomaterials with good properties. In the invention ...

AI Technical Summary

Problems solved by technology

However, these methods have disadvantages such as complex process, harsh reaction conditions, and the particle size of the product cannot be controlled.

The current industrial method for preparing iron oxide nanoparticles is to first prepare the iron hydroxide precursor and then roast it at high temperature, but this method is difficult to prepare small-sized nanomaterials with good properties

In the invention of Chinese patent application number 200410086479.1, the inventor proposed a new method for preparing iron oxide nanoparticles, but a large amount of toxic organic solvents were used in the process, and the use of these solvents may cause ecological problems during the preparation process. Pollution is also a threat to human health. In the invention of Chinese patent application No. 200510023582.6, the method of preparing iron oxide nanoparticles requires electron beam irradiation in addition to using organic solvents to stabilize iron oxide particles.