Mesoporous organic material, useful in particular for extracting uranium(VI) from aqueous media including phosphoric acid, and uses thereof

A method for recovering uranium(VI) from an aqueous medium comprising phosphoric acid and uranium(VI), comprising:

• an extraction of uranium(VI) from the aqueous medium by a mesoporous organic material obtainable by a cross-linking polymerisation of a monomer of formula (I):
• in which:
• R1, R2 and R3 represent, independently of each other, a hydrogen atom, a saturated or unsaturated, linear or branched hydrocarbon group comprising 1 to 12 carbon atoms or a polymerisable group comprising at least one unsaturation, provided that at least one of R1, R2 and R3 is a polymerisable group comprising at least one unsaturation;
• R4 and R5 represent, independently of each other, a hydrogen atom or a saturated or unsaturated, linear or branched hydrocarbon group comprising 1 to 8 carbon atoms;
• the cross-linking polymerisation being made with a cross-linking agent and one or several blowing agents;
• the extraction comprising contacting the aqueous medium with the material, and then separating the aqueous medium from the material;
• and
• a stripping of uranium(VI) from the material obtained at the end of the extraction, the stripping comprising contacting the material with an acid or basic aqueous solution, and then separating the material from the acid or basic aqueous solution.

A method for extracting uranium(VI) from an aqueous medium comprising phosphoric acid and uranium(VI), comprising:

• contacting the aqueous medium with a mesoporous organic material obtainable by a cross-linking polymerisation of a monomer of formula (I):
• in which:
• R1, R2 and R3 represent, independently of each other, a hydrogen atom, a saturated or unsaturated, linear or branched hydrocarbon group comprising 1 to 12 carbon atoms or a polymerisable group comprising at least one unsaturation, provided that at least one of R1, R2 and R3 is a polymerisable group comprising at least one unsaturation;
• R4 and R5 represent, independently of each other, a hydrogen atom or a saturated or unsaturated, linear or branched hydrocarbon group comprising 1 to 8 carbon atoms;
• the cross-linking polymerisation being made with a cross-linking agent and one or several blowing agents;
• and then
• separating the aqueous medium from the material.