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The present study evaluates the performance of ion flotation process for removal of uranyl tricarbonate complex, UO 2 (CO 3 ) 3  4− , which is the dominant species in many aqueous media particularly seawater, from aqueous solutions using cetyltrimethylammonium bromide, CTAB, as a cationic surfactant. Flotation of UO 2 (CO 3 ) 3  4−  as a function in the solution pH is investigated in absence and in presence of carbonate. Removal percentage &gt;99% is achieved in the pH range 8.5–11.5 in presence of 5×10 −3  M carbonate. The influence of concentrations of ethanol (0.1–2% v/v) and CTAB (5×10 −5 –1.4×10 −3  M) show that UO 2 (CO 3 ) 3  4−  is efficiently removed at concentrations of 0.5–1.5% v/v and 4×10 −4 –1×10 −3  M, respectively. Based on the obtained kinetic data, the flotation mechanism and the flotation rate are investigated using two different flotation models. Floatability of UO 2 (CO 3 ) 3  4−  in presence of different cations (Ba 2+ , Ca 2+ , Mg 2+  and Sr 2+ ) and anions (NO 3  − , Br − , Cl − , SO 4  2−  and HPO 4  2− ) is studied. Except for Mg 2+  and NO 3  − , the flotation efficiency of UO 2 (CO 3 ) 3  4−  is significantly decreased at concentrations higher than 1×10 −3  and 5×10 −3  M of the studied cations and anions, respectively. Ion flotation process is efficiently applied for removal of uranium(VI), R%&gt;98.5%, from seawater. Accordingly, ion flotation can be considered as a promising technique and thus its feasibility for removal and/or recovery of uranium(VI) from many aqueous environment.

Efficient decontamination of naturally occurring radionuclide from aqueous carbonate solutions by ion flotation process