Inorganic filtering material modified with organomineral grafting and preparation method

An inorganic filtration membrane comprising a support made of inorganic material coated with at least one separating membrane layer comprising particles of metal hydroxides and/or oxides, comprising, at the surface of said separating membrane layer, a molecular layer comprising organomineral units grafted onto the surface of the said separating layer, said organomineral units corresponding to the general formula IV below:

• (RO)pM[Z1R1]n[Z2R2]m IV
• in which:
• M represents a titanium or zirconium atom,
• R represents a group
• R1 and R2, which may be identical or different, represent a non-hydrolysable organic radical,
• m and n are equal to 0, 1, 2 or 3 and p is equal to 1 or 2, on condition that the sum of n, p and m is equal to 4 and with
• when p is equal to 1,
• Z1 and Z2, which may be identical or different, representing
• —O—, —OC(O)—, —OC(O)O—, —OP(O)(O—)2, —OP(O)(OH)P(O)(O—)2, OP(O)(OH)P(O)(O—)3, OP(O)(O—)3, OS(O)2— or OS(O)2(—)3 and
• when p is equal to 2,
• Z1 and Z2 together forming a divalent chain of cyclic structure such as a cyclopyrophosphite.