Ultrahigh-surface-area activated carbon aerogels derived from glucose for high-performance organic pollutants adsorption

Herein, carbon aerogels (CA) were prepared by a facile and eco-friendly approach from glucose, an abundant and inexpensive sugar molecule, and further activated by potassium hydroxide. An interconnected coral-like microstructure of carbon was built up in sol-gel process, and activation process resulted in a more efficient development of microporosity and mesoporosity. Thus, activated carbon aerogels (ACA) with specific surface area up to 2413 m(2).g(-1) were obtained. The unique morphology, ultrahigh specific surface area, and increased functional groups rendered the obtained ACA superior adsorption capacity (194.07-1030.05 mg.g(-1)) for several kinds of organic pollutants, such as phenols (phenol, p-nitrophenol and resorcinol), antibiotics (tetracycline, oxytetracycline, doxycycline and sulfamethazine), and dyes (methylene blue). Among them, the adsorption of p-nitrophenol onto ACA could reach 613.34 mg.g(-1) (293 K) and had a broad pH application range from 2 to 10 with good regeneration ability. The adsorption kinetics studies implied that intraparticle diffusion and pore diffusion were the limiting steps of the adsorption rate. Adsorption isotherms showed that the interaction between p-nitrophenol and ACA surface was monolayer adsorption. (C) 2019 Elsevier Inc. All rights reserved.