Preparation method and application of magnetic Fe304@CeO2 composite nano microparticles

The invention relates to a preparation method of magnetic Fe304@CeO2 composite nano microparticles and application of utilizing the magnetic Fe304@CeO2 composite nano microparticles to simulate enzyme activity and detect contents of hydrogen peroxide and glucose. The preparation method comprises the following steps: firstly preparing and obtaining magnetic Fe304 nano microparticles by adopting a hydrothermal method, and then coating the surface of the magnetic Fe304 nano microparticles with a CeO2 shell layer by using the magnetic Fe304 nano microparticles as a core, thus obtaining final composite nano microcparticles. The magnetic Fe304@CeO2 composite nano microparticles disclosed by the invention have a function of simulating catalysis of peroxidase, can be used for detection of low-concentration hydrogen peroxide and the glucose, have the advantages of high catalytic efficiency, easiness in separation, reusability and the like, and have a better application prospect in the fields of environment, biomedicin