“…When the valence is equal, the cation with a bigger atomic mass is sorbed. 41,42 Secondly, studies of TiSi xerogel sorption capacities in the same background solutions with only one cation (Sr 2+ or Cs + ) indicate different sorption mechanisms for these cations (chemisorption for Sr 2+ and activated sorption for Cs + ). 36,37 Coefficients of selectivity and separation factors were calculated in order to evaluate these assumptions.…”