Polysaccharide-polyamine copolymers for removal of phosphate
AssigneeHoward University
InventorsJames W. Mitchell, Dazhi Yang
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Abstract
Covalently cross-linked copolymers are described herein. More specifically, polysaccharide-polyamine copolymeric matrices or structures and cationic copolymeric matrices are described herein. The polysaccharide-polyamine copolymers, when protonated, can form cationic copolymeric matrices having exceptionally high densities of cationic sites. In one form, the covalently cross-linked copolymers provide a three-dimensional structure, especially when hydrated.
Claims6
A method to effect removal of phosphate from an aqueous phosphate solution, the method comprising applying a protonated particulate polysaccharide- polyamine copolymeric material having a three-dimensional structure, the particulate polysaccharide-polyamine polymeric material comprising:
- selectively oxidized polysaccharides having a 2,3 di-aldehyde moiety;
- and
- amino polymers which provide a cationic amino functionality, the amino polymers covalently cross linking the selectively oxidized polysaccharides to provide a particulate polysaccharide-polyamine copolymer and copolymeric material having an amino functionality which when protonate will provide the cationic copolymeric material with a nitrogen content of at least 12.3 wt. %, the cationic particulate polysaccharide-polyamine copolymer and cationic copolymeric material being water insoluble,
- wherein the selectively oxidized polysaccharides have β-1,6-glycosidic bonds.
Dependencies are inferred from the claim text.