Patent ID: 8092705

Claim:
A method for preparing a magnetic polymer, comprising: a) putting a polymer in a container, the polymer having groups capable of absorbing Fe 3+ ions and Fe 2+ ions or other divalent metal ions, and having large pores within the molecule or being capable of forming a microporous gel in a solution; b) adding a Fe 3+ salt solution into the polymer of a), and stirring to make the polymer absorb Fe 3+ ions; c) washing the resultant polymer of b) to eliminate unabsorbed Fe 3+ ions, adding an alkaline solution to control the pH value in a range from 9 to 14, stirring, and then washing to neutral; d) adding a divalent metal salt solution into the polymer of c), and stirring to make the polymer absorb divalent metal ions; e) washing the resultant polymer of d) to eliminate the unabsorbed divalent metal ions; and f) introducing an inert gas, adding an alkaline solution to control the pH value in a range from 9 to 14, stirring and heating for a period of time sufficient to produce a magnetic polymer, wherein a method for preparing a magnetic polymer is afforded.