Abstract: A method for grafting functional chemical groups to a textile substrate is provided, wherein the substrate is impregnated with a solution of a functional molecule, containing the functional chemical group and a group that is reactive to ionising radiation, as well as a surfactant molecule that can improve the wettability of the textile substrate by the solution. The surfactant molecule contains at least two types of groups that are reactive to ionising radiation. Subsequently, ionising radiation is applied to the impregnated textile substrate and the reaction of the reactive groups bridge-grafts the functional molecules to the surfactant molecules. A textile substrate and a battery separator grafted using the above method are also described.

Abstract: A medium for the filtration of a fluid containing molecules of a Lewis acid is described, wherein the medium comprises a fluid-porous textile substrate having molecules grafted thereto, the molecules including at least one group having the properties of a Lewis base, such that the molecules of the above-mentioned Lewis acid can be retained in the textile substrate upon complexation with the grafted groups. A method for producing one such medium and a method for removing boric acid from an aqueous solution using one such filtration medium are described.