Patent ID: 6447684
Filing Date: 2002-09-10
Classification: B01D,B01J,C02F,Y10S

Abstract:
A method for simultaneously removing metallic ions and particulate material from a pH neutral solution, comprising contacting said solution with a composition suitable for simultaneously removing metallic ions and particulate material contained in said solution and recovering a purified and filtered solution essentially depleted of metallic ions and particulate material to sub-parts-per-billion concentrations; wherein the composition comprises a membrane ligand combination represented by the formula:M-B-L wherein M is a membrane or composite membrane having a hydrophilic or partially hydrophilic surface and containing polar functional groups and having a pore size sufficient to filter particulate material contained in said solution;L is a ligand having an affinity for metallic ions and containing a functional group reactive with an activated polar group from the membrane; and B is a covalent linkage formed by the reaction between the activated polar group and the functional group of the ligand.