College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
College of Ecological Environment and Urban Construction, Fujian University of Technology, Fuzhou 350108, China.
Carbohydr Polym. 2018 Nov 15;200:611-615. doi: 10.1016/j.carbpol.2018.07.071. Epub 2018 Jul 25.
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.
海洋污染频繁的石油泄漏事故已经对海洋生态环境产生了灾难性的影响。尽管传统的超疏水/超亲油表面涂层材料已被证明在油水分离方面非常有效，但它们仍然存在制造工艺复杂、机械损伤以及在高盐环境中失去超疏油性等问题。本文制备了一种稳健的耐盐超疏油气凝胶，用于高效的油水分离。该气凝胶是通过冷冻干燥法将纳米纤维纤维素（NFC）掺入壳聚糖（CS）基体中制得的。NFC 增强的 3D 相互连接的网络结构保证了 CS/NFC 气凝胶的机械性能。壳聚糖的固有亲水性与气凝胶的粗糙微观结构相结合，赋予了其优异的水下超疏油性。值得注意的是，即使在高盐度海水中浸泡 30 天后，CS/NFC 气凝胶仍保持其水下超疏油性。此外，所制备的气凝胶能够高效（>99%）和出色地（至少 40 次分离循环）分离各种油/海水混合物。这些优异的性能结合其简单的制造工艺，使其成为海洋环境中油水分离的一种很有前途的候选材料。
