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Fe3O4 acted as the inner core, conducting polymer polypyrrole (PPy) was wrapped on the surface of Fe3O4, and salicylaldehyde (SA) was grafted to prepare the Fe3O4/PPy‐SA composite. Fe3O4/PPy‐SA exhibited double adsorption properties for Manganese (Mn) (VII) from aqueous solution. And the adsorption properties were systematically investigated. The influences of pH, initial metal ion concentration and...