Xu Hao, Zhang Zhong, Jiang Wei, Fang Xinrui, Xia Zhigang, Niu Haitao, Zhou Hua
Laboratory for Manufacturing Low Carbon and Functionalized Textiles in the Universities of Shandong Province/State Key Laboratory for Bio-Fibers and Eco-Textiles, College of Textiles & Clothing, Qingdao University, Qingdao 266071, China; Collaborative Innovation Center for Eco-textiles of Shandong Province and the Ministry of Education Collaborative, Qingdao University, Qingdao 266071, China.
Laboratory for Manufacturing Low Carbon and Functionalized Textiles in the Universities of Shandong Province/State Key Laboratory for Bio-Fibers and Eco-Textiles, College of Textiles & Clothing, Qingdao University, Qingdao 266071, China.
Carbohydr Polym. 2024 Apr 15;330:121774. doi: 10.1016/j.carbpol.2023.121774. Epub 2024 Jan 5.
Aerogels are of a popular choice for oil-water separation and water purification due to their attractive properties, such as lightweight, large surface area, and high porosity. Developing robust aerogels with multifunctional characteristics is highly desirable but remains challenging nowadays. Herein, we develop a facile one-pot condensation strategy for the fabrication of superhydrophilic-oleophobic (SHI-OP) composite aerogels using cellulose nanofibers (CNF), 3-glycidy-loxypropyl trimethoxysilane (GPTMS), polyethyleneimine (PEI) and fluorine-contained compound (FS-60). The resulted aerogels exhibit a directional lamellar structure with interconnected macropores, super-lightweight with high porosity of 98.30 % and low density of 0.0256 g·cm. Also, the aerogels are mechanically durable against repeated compression. Meanwhile, the amphibious SHI-OP feature of the composite aerogels in both air and water states enables them to not only absorb trace amount of water from contaminated oils, but also separate oil-water mixtures with separation efficiency of over 99 % and high permeation flux of over 9060 L/m·h. Moreover, the aerogels also show excellent dye adsorption capability and reusability toward anionic dyes with a maximum adsorption capacity of 1245.68 mg/g. Such robust and multifunctional aerogels with special surface wettability provide good opportunity for liquid purification and dye-containing wastewater treatment.
气凝胶因其具有诸如轻质、大表面积和高孔隙率等吸引人的特性，成为油水分离和水净化的热门选择。开发具有多功能特性的坚固气凝胶是非常可取的，但目前仍然具有挑战性。在此，我们开发了一种简便的一锅缩合策略，用于使用纤维素纳米纤维（CNF）、3-缩水甘油氧基丙基三甲氧基硅烷（GPTMS）、聚乙烯亚胺（PEI）和含氟化合物（FS-60）制备超亲水-疏油（SHI-OP）复合气凝胶。所得气凝胶呈现出具有相互连接的大孔的定向层状结构，超轻质，孔隙率高达98.30%，密度低至0.0256 g·cm 。此外，气凝胶在反复压缩下具有机械耐久性。同时，复合气凝胶在空气和水状态下的两栖SHI-OP特性使其不仅能够从受污染的油中吸收微量水分，还能分离油水混合物，分离效率超过99%，渗透通量高达9060 L/m·h以上。此外，气凝胶对阴离子染料还表现出优异的吸附能力和可重复使用性，最大吸附容量为1245.68 mg/g。这种具有特殊表面润湿性的坚固且多功能的气凝胶为液体净化和含染料废水处理提供了良好的机会。
