NOVEL ION-EXCHANGE COORDINATION RESIN WITH CARBOXYETHYL PHOSPHONATE LIGANDS/

A novel ion-exchange/coordination resin containing carboxyethyl phosph onate ligands was obtained from vinylbenzyl chloride/styrene/divinylbe nzene copolymer. Its properties (acid capacity, phosphorus content, wa ter regain) and sorption of di- and trivalent cations were determined. The efficiency of metal cation removal was compared to that displayed by ethylenediphosphonate resins. It was found that carboxyethyl phosp honate based resin, being less acidic, displayed higher selectivity. T he obtained log D for Cd(II), Zn(II), Ni(II) and Fe(III) were 2.81, 2. 77, 1.05 and 2.43, respectively. The hydrophilicity of resins was incr eased by introducing sulfonic groups into their structure which had a negligible effect on kinetics of ion removal under studied conditions. (C) 1998 Elsevier Science Ltd. All rights reserved.