Determination of Conditions for Selective Sorption of Silver(I) on Thiocarbamoylated Polyethylene

Abstract

Sorption properties of thiocarbamoylated polyethylene with respect to silver(I) from multicomponent solutions have been studied. It was found that the synthesized sorbent is characterized by a high sorption capacity and selectivity with respect to silver ions. In the static sorption mode, quantitative extraction is possible from solutions with a concentration of Ag(I) 1 · 10–4 mol/dm3 in the pH range from 1 to 7, with concomitant Ca(II), Mg(II), Cu(II), Fe(III), Zn(II), Cd(II), Ni(II), Mn(II), Co(II), Pb(II) have no effect on the degree of extraction of silver ions. The high selectivity of sorption is maintained under dynamic conditions in the presence of excessive amounts of base metal ions at pH 2. The total dynamic sorption capacity for silver is 0.35 mmol/g (solution transmission rate 2 cm3/min, pH 2, sorbent weight 0.1 g, C = 1 · 10–4 mol/dm3). The composition of the eluents providing the highest values of the degree of desorption of silver from the surface of the sorbent has been determined. It was found that during sorption using a sorbent after the sorption-desorption stage, its silver capacity decreases slightly.