Surface modification of bacterial cellulose aerogels' web-like skeleton for oil/water separation

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(...

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Vydané v:ACS applied materials & interfaces Ročník 7; číslo 13; s. 7373
Hlavní autori: Sai, Huazheng, Fu, Rui, Xing, Li, Xiang, Junhui, Li, Zhenyou, Li, Fei, Zhang, Ting
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: United States 08.04.2015
Predmet:
Adsorption
Bacteria - chemistry
Cellulose - chemistry
Gases - chemistry
Gels - chemistry
Hydrophobic and Hydrophilic Interactions
Materials Testing
Oils - chemistry
Oils - isolation & purification
Phase Transition
Surface Properties
Ultrafiltration - methods
Water - chemistry
Water Pollutants, Chemical - chemistry
Water Pollutants, Chemical - isolation & purification
Water Purification - methods
oil−water separation
aerogels
bacterial cellulose
liquid phase
surface modification
ISSN:1944-8252, 1944-8252
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Shrnutí: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 (≈ 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°) 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.
Bibliografia:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:1944-8252
1944-8252
DOI:10.1021/acsami.5b00846