Adsorption of U(IV) by several geomaterials: kinetic, adsorbent dosage and thermodynamic

Abstract

The behavior of U(IV) in the presence of several geomaterials (inorganic components of soils from an oyamel forest IMH(OF) and a semiarid zone IM(SZ), and two kinds of sands AS, AW) was studied. Kinetic data were best adjusted to the pseudo-second-order model. The order of the adsorption capacity was: IMH(OF) ≫ IM(SZ) > AS ≈ AW. The adsorption efficiencies decrease as the adsorbent dosage increases (0.01–0.125 g) for all materials and do not depend on the concentrations of sodium chloride from 0.035 to 0.1 M. Thermodynamic parameters indicate that the adsorption processes is exothermic.