Research Progress on the Application of Fe<sub>3</sub>O<sub>4</sub>/PI Magnetic Nanoparticles in Catalysts

The rapid development of the chemical industry has produced a large amount of industrial wastewater, posing a huge threat to the ecological environment and human health. Efficient treatment of sewage is an urgent problem to be solved at present. The combination of efficient nanoparticle catalysts and economical wastewater treatment technologies is an important method to solve water pollution problems. However, nanoparticles have the disadvantages of easy agglomeration, poor stability and difficulty in recovery, which reduces their catalytic performance. Fe3O4 magnetic catalyst, because of its structural characteristics of polyimide composite material and its magnetic field reaction characteristics of inorganic nanoparticles, makes the nanocomposite able to disperse and treat rapidly under the influence of an external magnetic field and can be reused. This paper provides a review of the preparation methods and their applications of Fe3O4 magnetic catalysts in recent years, and analyzes and prospects the application and existing problems of future research development.