Organic-inorganic hybrid material of use for extracting uranium (VI) from aqueous media containing phosphoric acid, processes for preparing same and uses thereof

An organic-inorganic hybrid material, which comprises an inorganic solid support on which is covalently grafted a plurality of organic molecules of formula (I):

• wherein:
• x, y and z are equal to 0 or 1, with the proviso that at least one of x, y and z is equal to 1;
• m is an integer ranging from 1 to 6;
• v and w are equal to 0 or 1, with the proviso that v is equal to 1 when w is equal to 0 and v is equal to 0 when w is equal to 1;
• if x is equal to 0, R1 represents a hydrogen atom or a linear or branched, saturated or unsaturated hydrocarbon group comprising from 1 to 12 carbon atoms, and, if x is equal to 1, R1 represents a group bound to the inorganic solid support through at least one covalent bond represented by the dotted line;
• if y is equal to 0, R2 represents a hydrogen atom or a linear or branched, saturated or unsaturated hydrocarbon group comprising from 1 to 12 carbon atoms, and, if y is equal to 1, R2 represents a group bound to the inorganic solid support through at least one covalent bond represented by the dotted line;
• if z is equal to 0, R3 represents a hydrogen atom or a linear or branched, saturated or unsaturated hydrocarbon group comprising from 1 to 12 carbon atoms, and, if z is equal to 1, R3 represents a group bound to the inorganic solid support through at least one covalent bond represented by the dotted line;
• R4 and R5 represent, independently of each other, a hydrogen atom, a linear or branched, saturated or unsaturated hydrocarbon group comprising from 2 to 8 carbon atoms, or a monocyclic aromatic group.