FIBER SORBENT Russian patent published in 2018 - IPC B01J20/285 D01F11/04 

FIELD: technological processes.

SUBSTANCE: invention relates to fiber sorbents for the removal of heavy metal ions from water and aqueous solutions. Fiber polyampholytic sorbent based on polyacrylonitrile modified with an aliphatic di-, oligo- or polyamine, which is a polymeric matrix of filaments with an outer ion-exchange layer of crosslinked together by intermolecular cross links of three-dimensional structures carboxy-N,N'-polyacrylamido-N,N'-di(iminoethane), proportion of which is at least 50 % and not more than 90 % of the total mass of the filament and that contain recurring sorptive bulk chelate centers from two amino groups and one carboxyl group.

EFFECT: new stable sorbent of a regular and ordered structure with increased sorption capacity to heavy metal ions is proposed, with high chelating properties and simultaneously selective to sorption of calcium and magnesium ions, with an increased content of anion-exchange and cation-exchange groups and a reduced degree of swelling.

6 cl, 1 dwg