SORPTION OF LEAD(II) BY PROTON-IONIZABLE POLYETHER RESINS

Novel ion-exchange resins have been prepared by condensation polymeriz ation with formaldehyde of dibenzo acyclic and cyclic polyethers beari ng a pendent acidic function (carboxylic acid, phosphonic acid monoeth yl ester, phosphonic acid, or sulfonic acid). Such resins possess both ion-exchange and polyether-binding sites for metal-ion complexation. The efficiency of Pb2+ sorption and selectivity relative to Zn2+ sorpt ion are assessed as a function of: (1) the acyclic, pseudocyclic, or c yclic nature of the polyether unit; (2) the identity of the proton-ion izable group; (3) the length of the spacer which joins the proton-ioni zable group to the polyether framework; and (4) for the proton-ionizab le crown ether resins, the atom or group which is geminal to the funct ional side arm. (C) 1998 Elsevier Science B.V. All rights reserved.