Metal Uptake Properties of Polystyrene Resin Immobilized Polyamine and Formylsalicylic Acid Derivatives as Chelation Ion Exchangers

Abstract

Chloromethylated polystyrene resin was chemically modified with ethylenediamine, diethylenetnamine and triethylene- tetramine to polystyrene-polyamine resins (I-III). The latter resins were further reacted with two formylsalicylic acid isomers, 3-formylsalicylic acid and 5-formylsalicylic acid, to produce the cross-linking polystyrene-polyamine- formylsalicylic acid resins (IV-IX). The possible chemical structure of I-IX was confirmed from the elemental analysis and FT-IR studies. The applicability of I-IX to extraction of Fe(III), Cu(II), Cd(II) and Pb(II) from aqueous solutions was also studied by using the batch equilibrium technique in different buffer solutions and at different shaking time. Several trends were drawn out from the metal capacity values concerning the chemical structure of the amine and formylsalicylic acid moieties. The application of chelation ion exchange resins I-IX for selective extraction of certain metal ions was evaluated on the basis of the distribution ratio (D) showing the following order: D_Fe(III)_??_D_Cd(II)> D_Pb(II)>D_Cu(II).