Patent ID: 8669316

Claim:
A method for preparing magnetic ion-exchange polymer microspheres comprises the steps of: (a) preparing ion-exchange polymer microspheres having a charged functional group, and immersing the ion-exchange polymer microspheres having a charged functional group into a solution in order to swell the ion-exchange polymer microspheres, and the ion-exchange polymer microspheres having a charged functional group are made of polystyrene, or a copolymer including styrene and at least one monomer, wherein the polystyrene or the copolymer forms a network structure of polymer chains by adding a cross-linking agent, and the solution allows the network structure of polymer chains to swell and expand; (b) adding a colloid solution containing magnetic nano-particles into the solution to form a mixture and adjusting the pH value of the mixture to 8-12 in order to allow the magnetic nano-particles to enter into the network structure of polymer chains, wherein the amount of magnetic nano-particles entrapped within the network structure of polymer chains is changed with the pH value; and (c) separating the ion-exchange polymer microspheres from the solution, wherein the ion-exchange polymer microspheres are non-porous, and the ion-exchange polymer microspheres shrink after removing the solution to allow the network structure of polymer chains to become compact, then the magnetic nano-particles are entrapped within the network structure of polymer chains.