材料科学
气凝胶
碳纤维
微型多孔材料
碳化
介孔材料
打赌理论
朗缪尔吸附模型
作者
Kerui Li,Minghua Zhou,Liang Liang,Lili Jiang,Wei Wang
标识
DOI:10.1016/j.jcis.2019.03.076
摘要
Abstract 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 m2·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.
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