Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
Int J Biol Macromol. 2020 Dec 15;165(Pt B):1869-1880. doi: 10.1016/j.ijbiomac.2020.10.068. Epub 2020 Oct 18.
Hydrophobic/oleophilic absorbents have been largely studied and used in recovering spilled oil. However, they still suffer from several drawbacks and two of them are poor biocompatibility and hard to thoroughly rinse. In order to address these problems, here a hydrophobic magnetic chitosan-based aerogel is fabricated via electrostatic interactions between chitosan (CS), itaconic acid (IA) and FeO nanoparticles and dip-coating in ethanol solution of Candelilla wax (CW). Due to the interconnected porous structure of chitosan-based aerogel, the magnetism of FeO nanoparticles and the hydrophobicity of CW, the prepared aerogel exhibits high absorption capacities (from 17.7 to 43.8 g/g) towards various types of organic liquids, excellent magnetic controllability with saturation magnetization of 15.93 emu/g and good water repellency with water contact angle (WCA) of 147.9°. In addition, the aerogel can also continuously separate immiscible oil/water mixtures and water-in-oil emulsions as the form of filter. More significantly, the absorbed organic liquids can be completely recovered by simply placing the aerogel in water solution of IA at 75 °C, which can avoid cleaning agent consumption. As a consequence, this renewable, biodegradable and eco-friendly oil scavenger presents a bright prospect in practical applications.
疏油/亲油吸收剂在回收溢油方面已得到广泛研究和应用。然而，它们仍然存在一些缺点，其中两个缺点是生物相容性差和难以彻底冲洗。为了解决这些问题，我们通过静电相互作用制备了一种基于壳聚糖的疏水性磁性气凝胶，壳聚糖（CS）、衣康酸（IA）和 FeO 纳米粒子，然后在乙醇溶液中的 Candelilla 蜡（CW）中进行浸涂。由于壳聚糖基气凝胶的互连多孔结构、FeO 纳米粒子的磁性和 CW 的疏水性，所制备的气凝胶对各种类型的有机液体表现出高吸收能力（从 17.7 到 43.8 g/g），具有 15.93 emu/g 的饱和磁化强度的优异磁可控性和 147.9°的良好疏水性。此外，气凝胶还可以连续分离不混溶的油/水混合物和油包水乳状液。更重要的是，通过将气凝胶简单地置于 75°C 的 IA 水溶液中，可以完全回收吸收的有机液体，从而避免了清洁剂的消耗。因此，这种可再生、可生物降解和环保的吸油剂在实际应用中具有广阔的前景。
