ORGANIC-INORGANIC HYBRID MATERIAL OF USE FOR EXTRACTING URANIUM(VI) FROM AQUEOUS MEDIA CONTAINING PHOSPHORIC ACID, PROCESSES FOR PREPARING SAME AND USES THEREOF

摘要

The invention relates to an organic-inorganic hybrid material which comprises an inorganic solid substrate onto which are grafted organic molecules of general formula (I) hereinafter in which: x, y and z = 0 or 1, with at least one of x, y and z being other than 0; m = 1 to 6; v and w = 0 or 1, with v = 1 when w = 0, and v = 0 when w = 1; if x = 0, R1 = H or a linear or branched, saturated or unsaturated C1 to C12 hydrocarbon-based group, whereas if x = 1, R1 = a group bonded to the inorganic solid substrate by at least one covalent bond; if y = 0, R2 = H or a linear or branched, saturated or unsaturated C1 to C12 hydrocarbon-based group, whereas if y = 1, R2 = a group bonded to the inorganic solid substrate via at least one covalent bond; if z = 0, R3 = H or a linear or branched, saturated or unsaturated C1 to C12 hydrocarbon-based group, whereas if z = 1, R3 = a group bonded to the inorganic solid substrate via at least one covalent bond; R4 and R5 = H, a linear or branched, saturated or unsaturated C2 to C8 hydrocarbon-based group, or a monocyclic aromatic group. It also relates to processes for preparing this hybrid material and to the uses of said material for extracting uranium(VI) from an aqueous medium comprising phosphoric acid. Applications: treatment of natural phosphates.