Kinetic and thermodynamic sorption studies of Fe(III) and Zr(IV) by DFO@Purolite, a desferrioxamine B based chelating resin

International audienceThis paper presents the characterization of a novel solid-phase sorbent for iron(III) and zirconium(IV)obtained by the functionalization of a commercial epoxy methacrylate resin (Purolites ECR8209) withdesferrioxamine B (DFO). The sorption properties of the solid material, named DFO@Purolite, towardsFe(III) and Zr(IV) were investigated in detail. In particular, the sorption kinetics, isotherms and sorptionprofiles as a function of the solution’s pH were studied. The stoichiometry and the complexationconstants of both cations with the active sites of the sorbent were determined by applying the Gibbs–Donnan model, i.e., the model used to explain the protonation and the metal sorption on ion exchangeresins. While the chelating properties of the solid material investigated herein are in good agreementwith those of Fe(III)/DFO and Zr(IV)/DFO previously determined in homogeneous aqueous solutions, thesolid/liquid extraction studies further allow to ascertain the speciation model for the latter system that isstill subjected to controversy in the literature