School of Engineering, Zhejiang A &F University, Hangzhou, Zhejiang Province, 311300, P. R. China.
Key Laboratory of Wood Science and Technology, Zhejiang Province, 311300, P. R. China.
Sci Rep. 2017 Apr 3;7:45914. doi: 10.1038/srep45914.
Cellulose nanofibril/graphene oxide hybrid (CNF/GO) aerogel was fabricated via a one-step ultrasonication method for adsorptive removal of 21 kinds of antibiotics in water. The as-prepared CNF/GO aerogel possesses interconnected 3D network microstructure, in which GO nanosheets with 2D structure were intimately grown along CNF through hydrogen bonds. The aerogel exhibited superior adsorption capacity toward the antibiotics. The removal percentages (R%) of the antibiotics were more than 69% and the sequence of six categories antibiotics according to the adsorption efficiency was as follows: Tetracyclines > Quinolones > Sulfonamides > Chloramphenicols > β-Lactams > Macrolides. The adsorption mechanism was proposed to be electrostatic attraction, p-π interaction, π-π interaction and hydrogen bonds. In detail, the adsorption capacities of CNF/GO aerogel were 418.7 mg·g for chloramphenicol, 291.8 mg·g for macrolides, 128.3 mg·g for quinolones, 230.7 mg·g for β-Lactams, 227.3 mg·g for sulfonamides, and 454.6 mg·g for tetracyclines calculated by the Langmuir isotherm models. Furthermore, the regenerated aerogels still could be repeatedly used after ten cycles without obvious degradation of adsorption performance.
纤维素纳米纤维/氧化石墨烯杂化（CNF/GO）气凝胶是通过一步超声法制备的，用于水中 21 种抗生素的吸附去除。所制备的 CNF/GO 气凝胶具有相互连接的 3D 网络微结构，其中具有 2D 结构的 GO 纳米片通过氢键紧密生长在 CNF 上。气凝胶对抗生素表现出优异的吸附能力。抗生素的去除率（R%）超过 69%，根据吸附效率对六类抗生素的顺序如下：四环素类>喹诺酮类>磺胺类>氯霉素类>β-内酰胺类>大环内酯类。吸附机制被提出为静电吸引、p-π 相互作用、π-π 相互作用和氢键。具体来说，CNF/GO 气凝胶对氯霉素的吸附容量为 418.7mg·g，对大环内酯类的吸附容量为 291.8mg·g，对喹诺酮类的吸附容量为 128.3mg·g，对β-内酰胺类的吸附容量为 230.7mg·g，对磺胺类的吸附容量为 227.3mg·g，对四环素类的吸附容量为 454.6mg·g，这些都是通过 Langmuir 等温模型计算得到的。此外，在十个循环后，再生气凝胶仍可重复使用，而吸附性能没有明显下降。
