Magnetic core-shell microspheres, and preparation method and use thereof

The invention discloses magnetic core-shell microspheres, and a preparation method and use thereof. The core-shell microspheres are prepared from the following materials in a certain ratio: nano Fe3O4, copper nitrate, trimesic acid and graphene oxide. The method comprises the steps of: (a) weighing the nano Fe3O4, the copper nitrate, the trimesic acid and the graphene oxide according to the ratio; pouring into a reaction kettle after ultrasonic oscillation, reacting at certain temperature and pressure; (b) heating and cooling by program; (c) separating sediments by an external magnet; preparing gray and black magnetic core-shell microspheres; respectively washing by distilled water and anhydrous ethanol and storing for later use; and (d) separating the anhydrous ethanol by the external magnet, and drying for use. The magnetic core-shell microspheres are strong in adsorption performance, can be efficiently used in cycle, can rapidly achieve balance within a short period of time, and are suitable for rapid trea