Magnetically separated and N, S co-doped mesoporous carbon microspheres(N/S-MCMs/Fe_3O_4) are fabricated by encapsulating SiO_2 nanoparticles within N, S-containing polymer microspheres which were prepared using resorcinol/formaldehyde as the carbon source and cysteine as the nitrogen and sulfur co-precursors, followed by the carbonization process, silica template removal, and the introduction of Fe_3O_4 into the carbon mesopores. N/S-MCMs/Fe_3O_4 exhibits an enhanced Hg~(2+)adsorption capacity of 74.5 mg/g, and the adsorbent can be conveniently and rapidly separated from wastewater using an external magnetic field. This study opens up new opportunities to synthesize welldeveloped, carbon-based materials as an adsorbent for potential applications in the removal of mercury ions from wastewater. Magnetically separated and N, S co-doped mesoporous carbon microspheres (N / S-MCMs / Fe_3O_4) are fabricated by encapsulating SiO_2 nanoparticles within N, S-containing polymer microspheres which were prepared using resorcinol / formaldehyde as the carbon source and cysteine ​​as the nitrogen and sulfur co-precursors, followed by the carbonization process, silica template removal, and the introduction of Fe_3O_4 into the carbon mesopores. N / S-MCMs / Fe_3O_4 exhibits an enhanced Hg 2+ adsorption capacity of 74.5 mg / g , and the adsorbent can be conveniently and rapidly separated from wastewater using an external magnetic field. This study opens up new opportunities to synthesize welldeveloped, carbon-based materials as an adsorbent for potential applications in the removal of mercury ions from wastewater.