Solubility of Eu 2 (SeO 3 ) 3 and sorption of Eu(III) onto TiO 2 in the presence of Se(IV)

Metal ions sorption can be significantly affected by the presence of other sorbates, especially of complexing ligands. In this study, the effect of Se(IV) on Eu(III) sorption onto TiO 2 at different pH and Eu(III) concentration was investigated. Se(IV) was found to enhance Eu(III) sorption as a function of Se(IV) concentration. Constant capacitance model was successfully used to interpret the sorption experimental data. The solubility product of Eu 2 (SeO 3 ) 3 at ambient temperature was investigated to highlight the sorption mechanism of ternary sorption system. The p K sp value of Eu 2 (SeO 3 ) 3 was found to be 31.51 ± 0.95.