Preparation and application of a novel magnetic anion exchange resin for selective nitrate removal

A novel magnetic anion exchange resin NDM-1 was prepared through suspension polymerization and then functionalized with ammonolysis and alkylating agents. Its application for selective removal of nitrate was performed in comparison with MIEX®. The results demonstrated that NDM-1 achieved higher efficiency in nitrate removal than MIEX® did, with or without the existence of competing anion SO42− ascribed to its longer alkyl chains on exchange sites. Combined with the advantage of easy separation due to γ-Fe2O3 implanted, the magnetic anion exchange resin NDM-1 was considered to be superior to MIEX® for nitrate removal in practical application.