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Novel integration of adsorption followed by catalytic oxidation is expected to be more beneficial for higher Mn(II) removal performance. We prepared self-assembled 3D flower-like Mg(OH) 2 coated on granular-sized polyurethane (namely FMHP) via hydrothermal method at 120 °C under a facile synthesis route. The optimized material, FMHP prepared with 7 g MgO and 20 g polyurethane (FMH 0.35 P), achieved up to 351.2 mg g−1 Mn(II) removal capacity by Langmuir isotherm model. Besides, FMHP exhibited high Mn(II) removal in a wide range of NaCl concentration (0~0.1 M) and pH 2–9. Notably, through consecutive kinetics, BET, XPS, XRD, FESEM, and TEM analyses, it was found that the MnO x layer grows in-situ via ion exchange with Mg(II) on FMHP and further boosts the Mn(II) removal via catalytic oxidation during the Mn(II) removal process. Further, column experiments revealed that the FMH 0.35 P exhibited superior Mn(II) removal capacities up to 135.9 mg g−1 and highly compatible treatment costs ($0.062 m−3) compared to conventional chemical processes. The granular-sized FMH 0.35 P prepared by economic precursors and simple synthesis route revealed a high potential for Mn(II) containing water treatment due to its high removal capacities and easy operation. [Display omitted] • Self-assembled 3D flower-like Mg(OH) 2 coated on granular-sized PU was prepared. • FMH 0.35 P, achieved up to 351.2 mg g−1 Mn(II) removal capacity. • FMHP exhibited high Mn(II) removal in a wide range of NaCl (0~0.1 M) and pH 2–9. • MnO x layer occurs in-situ and further catalytically oxidizes Mn(II) on FMHP. • Column application of FMH 0.35 P exhibited highly compatible treatment costs. [ABSTRACT FROM AUTHOR]

Novel integration of adsorption followed by catalytic oxidation is expected to be more beneficial for higher Mn(II) removal performance. We prepared self-assembled 3D flower-like Mg(OH) 2 coated on granular-sized polyurethane (namely FMHP) via hydrothermal method at 120 °C under a facile synthesis route. The optimized material, FMHP prepared with 7 g MgO and 20 g polyurethane (FMH 0.35 P), achieved up to 351.2 mg g−1 Mn(II) removal capacity by Langmuir isotherm model. Besides, FMHP exhibited high Mn(II) removal in a wide range of NaCl concentration (0~0.1 M) and pH 2–9. Notably, through consecutive kinetics, BET, XPS, XRD, FESEM, and TEM analyses, it was found that the MnO x layer grows in-situ via ion exchange with Mg(II) on FMHP and further boosts the Mn(II) removal via catalytic oxidation during the Mn(II) removal process. Further, column experiments revealed that the FMH 0.35 P exhibited superior Mn(II) removal capacities up to 135.9 mg g−1 and highly compatible treatment costs ($0.062 m−3) compared to conventional chemical processes. The granular-sized FMH 0.35 P prepared by economic precursors and simple synthesis route revealed a high potential for Mn(II) containing water treatment due to its high removal capacities and easy operation. [Display omitted] • Self-assembled 3D flower-like Mg(OH) 2 coated on granular-sized PU was prepared. • FMH 0.35 P, achieved up to 351.2 mg g−1 Mn(II) removal capacity. • FMHP exhibited high Mn(II) removal in a wide range of NaCl (0~0.1 M) and pH 2–9. • MnO x layer occurs in-situ and further catalytically oxidizes Mn(II) on FMHP. • Column application of FMH 0.35 P exhibited highly compatible treatment costs. [ABSTRACT FROM AUTHOR]