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Nitrogen-doped porous carbon nanosheets derived from poly(ionic liquid)s: hierarchical pore structures for efficient CO₂ capture and dye removal

Gong, Jiang, Lin, Huijuan, Antonietti, Markus, Yuan, Jiayin
Journal of materials chemistry A 2016 v.4 no.19 pp. 7313-7321
adsorption, carbon, carbon dioxide, carbon nitride, carbonization, ionic liquids, methylene blue, nanosheets, nitrogen content, surface area, wastewater
Poly(ionic liquid) has recently served as an important precursor for nitrogen-doped functional porous carbons. It was applied here in a facile one-pot approach to synthesize nitrogen-doped porous carbon nanosheets (NPCNSs) using C₃N₄ nanosheets as sacrificial templates. C₃N₄ nanosheets are found to improve the carbonization yield and nitrogen content of NPCNSs and additionally facilitate the formation of a unique pore structure. Without post-treatments or activation steps, the as-synthesized NPCNS readily reaches a specific surface area above 1100 m² g⁻¹ with hierarchical micro-/meso-/macropore structures while keeping a high nitrogen content (17.4 wt%). More significantly, the NPCNS is able to deliver not only a high CO₂ adsorption capacity with outstanding reversibility, but also an unprecedented capacity in methylene blue uptake by 962.1 mg g⁻¹, which is among the few highest ever reported for wastewater, with excellent reusability.