Recycling Antimony(III) by Magnetic Carbon Nanospheres: Turning Waste to Recoverable Catalytic for Synthesis of Esters and Triazoles

Abstract

In recent years, the removal of antimony(III) (Sb(III)) contaminant from water has caused widespread concern. Herein, two adsorbents have been successfully developed to remove Sb(III) from water and systemically characterized. One is the composite of magnetic mesoporous carbon nanospheres (Fe3O4@CNs) with Fe2O3 particles that is represented as Fe3O4@Fe2O3@CNs, and the other one is mesoporous carbon nanosphere-accommodated Fe2O3 particles noted as Fe2O3@CNs. Both adsorbents have the advantages of magnetic separation and high Sb(III) removal capacity. The adsorption properties of Sb(III) on both adsorbents were studied by the experiments of adsorption isotherms and kinetics. The results show that the adsorption behaviors on both adsorbents follow the Langmuir isotherm model and pseudo-second-order kinetic model. The maximum Sb(III) adsorption capacity of Fe3O4@Fe2O3@CNs and Fe2O3@CNs is 234.28 and 102.84 mg/g, respectively. The high capacity can be attributed to the adsorption-active Fe2O3 particles that ar...