Synthesis of N-doped Carbon Spheres Using Extended Stöber Method for SO2Adsorption

Abstract

SO2is one of the major pollutants in the atmosphere. N-doped microporous carbon spheres (NCS) have been demonstrated to be effective for SO2adsorption. Here we report the synthesis of monodispersed NCS by the extended Stöber method with urea resorcinol-formaldehyde resins as carbon source, urea as nitrogen source and ammonia as catalyst in an ethanol-water mixed solvent. The obtained carbon spheres show a uniform diameter of around 550[Formula: see text]nm, specific surface area of 476[Formula: see text]m2[Formula: see text]g[Formula: see text], micropores pore volume of 0.20[Formula: see text]cm3[Formula: see text]g[Formula: see text] and nitrogen doping. The NCS manifest special performance for SO2capture with capability of 75.34[Formula: see text]mg[Formula: see text]g[Formula: see text] and good cycling stability, due to the large surface area, abundant micropores and nitrogen functionality.