Abstract
Adsorption of uranium(VI) species onto a magnetite sol was studied onto a magnetite sol was studied in the presence of bicarbonate ion in the pH range 7 to 9. The initial uranium uptake decreases as the pH increases, and an anionic hydroxy carbonate species is likely involved. At the highest pH and at uranium(VI) concentrations above 70 μmole · dm −3, a precipitate forms on the surface of the magnetite. A few studies were carried out on adsorption of uranium(VI) onto the same sol but in the presence of sodium chloride and in the pH range of 3 to 6. A small initial adsorption was noted at lower pH values, but this increased considerably when the pH reached 5.7. These adsorption results are roughly similar to those observed for adsorption of uranium(VI) onto a hematite sol when adsorption is compared on a unit surface area basis.
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