Patent ID: 9327267
Filing Date: 2016-05-03
CPC Classification: B01J,C08J,C22B,D02G,D06M,Y10T

Claim Text:
1. A method for forming a powder-based adsorbent for the recovery of metal ions from an aqueous solution, the method comprising: exposing a polymer fiber to ionizing radiation, the polymer fiber defining a mean diameter of less than 15 microns; co-grafting polymerizable monomers containing nitrile and hydrophilic groups onto the irradiated polymer fiber to form grafted side chains; reacting the nitrile groups in the grafted side chains with a reagent to convert the nitrile groups into amidoxime groups; conditioning the polymer fiber with an alkaline solution; and grinding the co-grafted polymer fiber into polymer granules to form a powder-based adsorbent having grafted side chains with amidoxime groups.