Sorption of 237Np(V), 238U(VI), and 137Cs on clays: Role of surface films of Fe(III) compounds

Radiochemistry

“…The ability of carbon, either in the form of nanotubes, 167 or activated carbon, 168 or carbonised apricot stones, 169 to adsorb uranium, thorium and similar elements has been investigated. Extensive studies continue into the sorption capabilities of bentonite for uranium, 170 montmorillite for fission products 171 such as nickel, whilst more general studies have focused on the ability of 'mudrock' 172 to adsorb caesium and selenium, or clays 173 to take up transuranic elements and caesium-137. The adsorption of the pertechnate anion onto clay and sandy sediments 174 has been thoroughly studied and other recent work has determined 175 the optimum conditions for its reduction to Tc(IV), in which state it is readily adsorbed onto layered minerals such as vermiculite, illite and muscovite.…”