Selective extraction of Fe³⁺ by a polymeric calix[4]arene

Abstract

Abstract A polymeric compound containing more than one calixarene molecule was synthesized by reacting the oligomer ( 2 ) with 25,26,27‐tribenzoyloxy‐28‐hydroxy calix[4]arene. After basic hydrolysis of 3a , the polymeric calixarene ( 3b ) was utilized for selective extraction of some metal cations from aqueous phase to organic phase. It was found that the compound ( 3b ) was selective toward Fe 3+ from an aqueous solution containing Cu 2+ , Ni 2+ , Co 2+ and Fe 3+ cations. The mechanism of the extraction process was discussed. © 1994 John Wiley & Sons, Inc.