Abstract

Synthesis, characterization and ion-exchange properties of a terpolymer derived from 4-hydroxybenzophenone, biuret and formaldehyde

Author(s): Deepti B. Patle1, Wasudeo B. Gurnule2*and A. B. Zade1

The terpolymer resins (4-HBPBF) have been synthesized by the condensation of 4- hydroxybenzaldehyde (4-HBP) and biuret (B) with formaldehyde (F) in the presence of acid catalyst and using 2:1:3 molar proportions of the reacting monomers. Terpolymer resins composition has been determined on the basis of elemental analysis and the number average molecular weight of these resins was determined by conductometric titration in non-aqueous medium. Viscometric measurements in Dimethyl sulphoxide (DMSO) have been carried out with view to ascertain the characteristic functions and constants. The structure of 4-HBPBF-II terpolymer has been elucidated on the basis of elemental analysis and various physicochemical techniques, i.e. UV-Visible, FT-IR, 1H NMR and 13C NMR spectroscopy. The morphological feature of the 4-HBPBF-II terpolymer was established by scanning electron microscopy (SEM). The chelating ion-exchange study was carried out over a wide pH range, shaking time and in media of various ionic strengths for six metal ions Fe3+, Cu2+, Ni2+, Zn2+, Cd2+ and Pb2+ in the form of their metal nitrate solutions. The terpolymer showed a higher selectivity for Fe3+, Cu2+ and Ni2+ ions then for Zn2+, Cd2+ and Pb2+. Study of distribution ratio as a formation of pH indicates that the amount of metal ion taken by resin is increases with the increasing pH of the medium. The results of the ion-exchange studies reveal that the 4-HBPBF-II terpolymer was found to be an excellent cation-exchanger for selective metal ions.

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