Sorption of trivalent europium Eu(III) by Na-substituted bentonite: Mechanistic insight and stabilization effect.

The sorption of Eu(III) by Na-substituted bentonite (Na-bentonite) was investigated as a function of pH and NaNO concentration ([NaNO]). At pH < ∼7.5, Eu(III) sorption decreased with the increasing [NaNO], whereas at pH > ∼7.