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Published on: May 9, 2019
Ultrahigh-surface-area activated carbon aerogels derived from glucose for high-performance organic pollutants
Kerui Li1, Minghua Zhou1, Liang Liang1
1Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Tianjin Advanced Water Treatment Technology International Joint Research Center, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
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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