Porous magnetic manganese oxide nanostructures: Synthesis and their application in water treatment

► Magnetic manganese oxide nanostructures are fabricated by mixing a KMnO4 solution and oleic acid capped Fe3O4 particles. ► Magnetic manganese oxide nanostructures used as absorbents with strong adsorption capability and large removal rates in wastewater treatment. ► Magnetic manganese oxide nanostructures could be separated easily and efficiently under an external magnetic field. ► Magnetic manganese oxide nanostructures could be recovered by combustion and kept their adsorption capability.