FIELD: technological processes.
SUBSTANCE: invention relates to a supported membrane, a process for the preparation of a membrane and a method for extracting solid particles and metal cations by said membrane, specifically, to a method for filtering solid particles and extracting metal cations, in particular radioactive ones, contained in a liquid. Supported membrane contains a solid porous inorganic filtration membrane supported by a solid porous inorganic support. Supported membrane contains nanoparticles of a metal coordination polymer with CN ligands containing cations Mn+, where M is a transition metal, and n is 2 or 3; and anions Alk+y[M'(CN)m]x-, where Alk is an alkali metal, y is 0, 1 or 2, M' means a transition metal, x is 3 or 4, and m is 6 or 8. Cations Mn+ coordination polymer are connected by an organometallic or coordination link to an organic group of an organic graft, chemically bonded to the surface of the filtration membrane, inside the pores of the filtration membrane and optionally inside the pores of the support. Process for separating at least one metal cation and solid particles from a liquid medium, in which they are located, with the use of said supported membrane, involves contacting the liquid medium stream with the first side of the supported membrane opposite to the support. Second portion of the liquid medium stream, not passed through the supported membrane, is collected on the first side of the membrane and forms a reagent enriched in solid particles. Metal cation is immobilized on the surface of a solid porous inorganic filtration membrane, inside the pores of the membrane and, possibly, inside the pores of a solid porous inorganic support.
EFFECT: invention allows the separation of solid particles and metal cations, in particular radioactive substances contained in a liquid, to be carried out simultaneously with high efficiency.
28 cl, 8 dwg, 4 ex, 3 tbl
