BIFUNCTIONAL ANION-EXCHANGE RESINS WITH IMPROVED SELECTIVITY AND EXCHANGE KINETICS

摘要

Disclosed herein are a class of anion exchange resins containing two different exchange sites with improved selectivity and sorptive capability for chemical species in solution, such as heptavalant technetium (as pertechnetate anion, TcO4). The resins are prepared by first reacting haloalkylated cross-linked copolymer beads with a large tertiary amine in a solvent in which the resin beads can swell, followed by reaction with a second, smaller, tertiary amine to more fully complete the functionalization of the resin. The resins have enhanced selectivity, capacity, and exchange kinetics.