期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 13, 页码 7373-7381出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b00846
关键词
surface modification; bacterial cellulose; aerogels; liquid phase; oil-water separation
资金
- National Basic Research Program of China (973 Program) [2011CB706900]
- National Nature Science Foundation of China [50872149, 50502003]
- Scientific Research Foundation for Returned Scholars within the Ministry of Education of China
- President Foundation of the Graduate University of the Chinese Academy of Sciences
The cellulose nanofibers of bacterial cellulose aerogel (BCA) are modified only on their surfaces using a trimethylsilylation reaction with trimethyichlorosilane in liquid phase followed by freeze-drying. The obtained hydrophobic bacterial cellulose aerogels (HBCAs) exhibit low density (<= 6.77 mg/cm(3)), high surface area (>= 169.1 m(2)/g), and high porosity (approximate to 99.6%), which are nearly the same as those of BCA owing to the low degrees of substitution (<= 0.132). Because the surface energy of cellulose nanofibers decreased and the three-dimensional web-like microstructure, which was comprised of ultrathin (20-80 nm) cellulose nanofibers, is maintained during the trimethylsilylation process, the HBCAs have hydrophobic and oleophilic properties (water/air contact angle as high as 146.5 degrees) that endow them with excellent selectivity for oil adsorption from water. The HBCAs are able to collect a wide range of organic solvents and oils with absorption capacities up to 185 g/g, which depends on the density of the liquids. Hence, the HBCAs are wonderful candidates for oil absorbents to clean oil spills in the marine environment. This work provides a different way to multifunctionalize cellulose aerogel blocks in addition to chemical vapor deposition method.
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