| Abstract: |
The sorption behavior of europium onto two iron-oxides, goethite and magnetite, focused on the effect of carbonate species concentration was investigated in 0.01 M NaClO4 solution by the batch method over a pH range of 4 to 11. It was found that sorption of europium was enhanced in the higher concentration solution of carbonate species for both materials. The zeta-potential of goethite in the solutions including sodium bicarbonate was also measured to estimate the effect of sorbed carbonate species. Our experimental results and model calculation suggest that the production of surface carboxylic group FeOCOO by the sorption of carbonate species lowered the zeta-potential and enhanced europium sorption. |
