METAL UPTAKE PROPERTIES OF POLYSTYRENE RESIN IMMOBILIZED POLYAMINE AND FORMYLSALICYLIC ACID-DERIVATIVES AS CHELATION ION-EXCHANGERS

Chloromethylated polystyrene resin was chemically modified with ethyle nediamine, diethylenetriamine and triethylenetetramine to polystyrene- polyamine resins (I-III). The latter resins were further reacted with two formylsalicylic acid isomers, 3-formylsalicylic acid and 5-formyls alicylic acid, to produce the cross-linking polystyrene-polyamine-form ylsalicylic acid resins (IV-IX). The possible chemical structure of I- IX was confirmed from the elemental analysis and FT-IR studies. The ap plicability 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 equilibri um technique in different buffer solutions and at different shaking ti me. Several trends were drawn out from the metal capacity values conce rning the chemical structure of the amine and formylsalicylic acid moi eties. The application of chelation ion exchange resins I-IX for selec tive extraction of certain metal ions was evaluated on the basis of th e distribution ratio (D) showing the following order: D-Fe(III)>>D-Cd( II)>D-Pb(II)>D-Cu(II).