PERTRACTION OF COPPER(II) IN THE PRESENCE OF COBALT(II), NICKEL(II), MANGANESE(II) AND IRON(II) USING SUPPORTED LIQUID MEMBRANE

Abstract

Pertraction of Cu(II) in the presence of several bivalent cations such as Co(II), Ni(II), Mn(II) and Fe(II) using D2EHPA(di-2-ethyl hexyl phosphoric acid)-kerosene supported liquid membrane is reported. The standard parameters used for the study are [Cu(II)] in feed 7.869 mol m-3, [D2EHPA] in membrane phase 400 mol m-3, [H2SO4] in strip solution 1800 mol m-3, pH 4.5 and temperature 303 K. The rate constants k1, membrane diffusion coefficient DBAR, aqueous film diffusion coefficient k(w) have been estimated from different approximated limiting conditions. Membrane diffusion coefficient DBAR for copper-D2EHPA complex has been determined by dialysis experiment as 1.2 x 10(-12) m2 s-1. Co(II), Ni(II) and Fe(II) copermeate along with Cu(II) to a small extent while Mn(II) copermeates significantly and it has been found that J(Mn) is more than J(Cu). Separation factors are calculated and reported.