Journal
CARBOHYDRATE POLYMERS
Volume 200, Issue -, Pages 611-615Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.07.071
Keywords
Chitosan; Aerogel; Salt-tolerance; Underwater superoleophobicity; Oil/water separation
Categories
Funding
- Natural Science Foundation of China [21506031]
- Fujian Natural Science Foundation [2017J01570]
- FAFU [KXJQ17030]
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Marine pollution caused by frequent oil spill accidents has already produced catastrophic influence on marine ecological environments. Even though traditional superhydrophobic/superoleophilic surface-coated materials have demonstrated to be effective for oil/water separation, they still suffer from complicated fabrication procedures, mechanical damages and loss of their superoleophobicity in high-salinity environments. Herein, a robust salt-tolerant superoleophobic aerogel was introduced for highly efficient oil/seawater separation, which was fabricated by incorporating nanofibrillated cellulose (NFC) into chitosan (CS) matrix through freeze-drying method. The NFC-reinforced 3D interconnected network structure guaranteed the mechanical performance of the CS/NFC aerogel. Together the inherent hydrophilicity of chitosan with the rough microstructure of the aerogel, excellent underwater superoleophobicity was developed. Notably, the CS/NFC aerogel still maintained its underwater superoleophobicity even after being soaked in high-salinity seawater for 30 days. Moreover, the as-prepared aerogel was able to achieve various kinds of oil/seawater mixtures separation with high efficiency (> 99%) and outstanding recyclability (at least 40 separation cycles). These excellent properties combined with its facile fabrication process make it a promising candidate for oil/water separation in marine environments.
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