The invention discloses a porous magnetic
starch microsphere and a preparation method thereof. The method is characterized in that
organic peroxide-
surface modified Fe3O4 magnetic particle is used as a
nucleus,
mineral oil is used as a continuous phase,
starch molecules and the magnetic
nucleus are combined through reversed-phase
polymerization reaction to form a magnetic
starch micro
sol particle with a nuclear-shell structure, the starch molecules on a shell layer are subjected to cross-linking reaction under the action of cross-linking agent-
epoxy chloropropane, so that the magnetic starch micro
sol is gelatinized to obtain magnetic starch micro gel, then the magnetic starch micro gel is subjected to demulsification, washing,
magnetic separation, supercritical CO2 extraction and
drying to obtain the porous magnetic
starch microspheres. The porous magnetic starch
microsphere is round, has uniform particle size, narrow pore size distribution, large specific surface and high
mechanical strength, and the porous magnetic starch has a magnetic guiding function and a flexible and strong adsorption loading function, and has wide application prospect in the fields of
sewage treatment, targeted drugs, catalytic industry, environment monitoring, immobilized enzymes and the like.