Methods for extracting and retrieving the uranium present in an aqueous solution including phosphoric acid

Method for extracting uranium(VI) from an aqueous solution S comprising phosphoric acid, this method including placing the aqueous solution S in contact with an organic material, followed by separation of the aqueous solution and the organic material, characterized in that the organic material comprises a solid polymeric substrate impregnated with a compound meeting following general formula:

• where:
• m is an integer of 0, 1 or 2;
• R1 and R2, the same or different, are a linear or branched, saturated or unsaturated hydrocarbon group having 6 to 12 carbon atoms;
• R3 is:
• a hydrogen atom;
• a linear or branched, saturated or unsaturated hydrocarbon group having 1 to 12 carbon atoms and optionally one or more heteroatoms;
• a saturated or unsaturated hydrocarbon group comprising one or more rings of 3 to 8 carbon atoms, the ring(s) optionally comprising one or more heteroatoms;
• or
• an aryl group comprising one or more rings, the ring(s) optionally comprising one or more heteroatoms;
• or else R2 and R3 together form a group —(CH2)n— where n is an integer ranging from 1 to 4;
• R4 is:
• a linear or branched, saturated or unsaturated hydrocarbon group having 2 to 8 carbon atoms;
• a saturated or unsaturated hydrocarbon group comprising one or more rings, the ring(s) optionally comprising one or more heteroatoms;
• or
• an aromatic group comprising one or more rings, the ring(s) optionally comprising one or more heteroatoms;
• and
• R5 is a hydrogen atom or a linear or branched, saturated or unsaturated hydrocarbon group having 1 to 12 carbon atoms.