Iron (III) chelating resins. V. Cross‐linked copolymers of 1‐(β‐acrylamidoethyl)‐3‐hydroxy‐2‐methyl‐4(1H)pyridinone (AHMP) and <i>N</i>,<i>N</i>‐dimethylacrylamide (DMAA) for iron (III) chelation studies

Abstract

Abstract Iron (III) chelating resins containing 3‐hydroxy‐2‐methyl‐4(1H)pyridinone (HMP) groups were prepared from 1‐(β‐acrylamidoethyl)‐3‐hydroxy‐2‐methyl‐4(1H)pyridinone (AHMP) and N , N ‐dimethylacrylamide (DMAA), using N , N ′‐ethylene‐bis‐acrylamide (EBAA) as a cross‐linking agent. The cross‐linked AHMP–DMAA copolymer resins were very stable and exhibited a high hydrophilicity with water contents of the swollen resins of 85–90%. The iron (III) chelating capacity of the resins was determined at physiological pH, and the chelating efficiency was, in general, higher than 90%. The iron (III) chelation was about 80% after 2 h and almost complete in 8 h. The distribution ratio of iron (III) between the resin and iron (III) solutions was quite high (3700–25,000 mL/g) and depended on the initial iron (III) concentration. It was possible to remove iron completely from aqueous solutions by using excess amounts of the resin. The resin also showed a very high selectivity for iron (III), and selectivity coefficients for iron (III) in the range of 9.6 × 10 8 −1.4 × 10 12 were determined at pH 5.6 in binary solutions of Fe 3+ with Mg 2+ , Cu 2+ , Ca 2+ , Mn 2+ , and Zn 2+ . The iron (III) chelating resins could be easily regenerated and used again without any considerable loss of their iron (III) chelating capacities. © 1994 John Wiley &amp; Sons, Inc.