Synthesis of nitrogen-doped and mesoporous carbon spheres decorated with[Bmim]Zn2Cl5 for hydrogen sulfide and ammonia removal
Nitrogen-doped and mesoporous carbon spheres with the size of 0.4～0.8 mm,a high surface area of 915 m2·g-1,and a large pore volume of up to 1.96 cm3·g-1 were synthesized via sol-gel and suspension polymerization method using resorcinol-formaldehyde as the carbon source,melamine as the nitrogen precursor,and colloidal silica as the hard template.The as-prepared carbon spheres were impregnated with ion liquid[Bmim]Zn2Cl5 as an adsorbent for hydrogen sulfide and ammonia.It is found that the mesoporous structure and nitrogen-doped surface could facilitate the uniform distribution of active component[Bmim]Zn2Cl5and sulfur-containing products after desulfurization on the pores of carbon spheres.The adsorbent with[Bmim]Zn2Cl5 mass loading of 50％exhibits breakthrough ca-pacities of 790 mg/g and 41.3 mg/g for hydrogen sulfide and ammonia,respectively.Additionally,the investigation of the spent adsor-bent and mechanism reveals that the hydrogen sulfide removal is based on the catalysis of carbon-based adsorbents while the ammonia removal is due to the chemical adsorption of the active component.
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