Application of Amberlite IRA-402 Modified by Means of 2-( p -Sulphophenylazo)-1,8-dihydroxy-3,6-naphthalene Disulphonate for the Recovery of Cu(II),Co(II),Cd(II),Ni(II),Mn(II) and Fe(III) Ions

Abstract

2-(p-Sulphophenylazo)-1,8-dihydroxy-3,6-naphthalene disulphonate (SPADNS), an aromatic complexing agent, may be loaded onto the styrene–divinylbenzene matrix of a strongly basic anion-exchanger in order to obtain a chelating resin. The uptake of Cu(II), Co(II), Cd(II), Ni(II), Mn(II) and Fe(III) ions on Amberlite IRA-402 modified by SPADNS was studied at 25°C. Phase contact time, acid addition (HCl, H₂SO₄ or CH₃COOH) and temperature are the factors which determine SPADNS sorption when the batch technique is employed. The total and working ion-exchange capacities as well as the recovery factors for SPADNS were calculated.