Sorption / Eu(III) / TiO 2 / Surface complexation / ModelingSummary. Eu(III) sorption on TiO 2 (anatase) was investigated as functions of pH, ionic strength and Eu(III) concentration by using a batch experimental method. It was found that Eu(III) sorption on anatase is strongly pH-dependent, but insensitive to ionic strength. A constant capacitance model with three inner-sphere surface complexes, ≡SOEu 2+ , ≡SOEuOH + and ≡SOEu(OH) 3 − , was used to interpret Eu(III) sorption on anatase in the absence and presence of carbonate ( p CO 2 = 10 −3.58 atm).
Uranium(VI) / Sorption / Desorption / SilicaSummary. Sorption of U(VI) on silica was investigated as functions of contact time, pH, ionic strength, solid-toliquid ratio (m/V ) and U(VI) concentration by using a batch experimental method. It was found that sorption kinetics is relatively rapid and 1 h is sufficient to reach sorption steady state. The sorption of U(VI) increases from about 0 to 100% with pH over the range of 2.8 to 5.8. Sorption isotherms were collected at pH 4.3 and three ionic strengths (0.01, 0.1 and 0.5 mol/L NaCl). It was found that the sorption of U(VI) increases with decreasing ionic strength at pH 4.3 and relatively low U(VI) concentrations. The sorption of U(VI) with variable m/V at pH 4.2 and initial U(VI) concentration of 1.03 × 10 −4 mol/L indicated that the U(VI) distribution coefficient increases slightly with the increase of m/V over the range of 1 to 100 g/L. Desorption was performed by dilution of aqueous U(VI) concentration for desorption isotherms and by pH adjustment of the suspension for pH desorption edges. It was found that sorption/desorption is reversible with respect to aqueous pH values, whereas a hysteresis was found for desorption isotherms. All equilibrium data were fitted with a surface complexation model. A mononuclear inner-sphere surface complex ≡SOUO 2 + and a polynuclear surface complex ≡SO(UO 2 ) 3 (OH) 5 were used to quantitatively interpret sorption of U(VI) on silica.
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