Yang Yixin, Dong Jinghan, Wang Ran, Lin Zian, Cai Zongwei
Ministry of Education Key Laboratory of Analytical Science for Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China.
Ministry of Education Key Laboratory of Analytical Science for Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China.
J Hazard Mater. 2023 Oct 5;459:132149. doi: 10.1016/j.jhazmat.2023.132149. Epub 2023 Jul 24.
Oil contamination and industrial organic pollutants emission have been a serious problem affecting the ecological and residential environment. Membrane-based separation shows great application prospect due to its low-cost, environmental-friendly and easy operation. Therefore, the development of efficient oil-water separation membranes is highly desirable. Herein, a fabric filter with superwettability was prepared by coating urchin-like fluorinated covalent organic frameworks (COFs) on fabric, which was well utilized in filtering immiscible oil-water mixture and surfactant-stabilized water-in-oil emulsion driven only by gravity for the first time. The as-prepared COF fabric filter (defined as fabric@u-FCOF) possessed many outstanding properties, including superhydrophobicity with the water contact angle of approximately 151.6°, satisfactory resistance for alkaline, acidic and saline environments, as well as superior mechanical durability under harsh conditions. Because of the super-micropore of fabric@u-FCOF and the nanopore in the COF coating, the obtained fabric@u-FCOF exhibited excellent performances in terms of separation efficiency and permeability, in which the oil flux was up to 16964 L·m·h and separation efficiency for the mixed o-dichlorobenzene/water was higher than 99.4%. In addition, the fabric@u-FCOF also showed excellent self-cleaning performance due to the micro/nano hierarchical structure of its surface. These excellent properties make it an ideal candidate for applications of oil/water separation and water purification.
油污污染和工业有机污染物排放一直是影响生态和居住环境的严重问题。基于膜的分离技术因其低成本、环境友好且操作简便而展现出巨大的应用前景。因此，开发高效的油水分离膜非常必要。在此，通过在织物上涂覆海胆状氟化共价有机框架（COF）制备了具有超润湿性的织物过滤器，该过滤器首次在仅靠重力驱动的情况下，成功用于过滤不互溶的油水混合物和表面活性剂稳定的油包水乳液。所制备的COF织物过滤器（定义为织物@u-FCOF）具有许多优异性能，包括水接触角约为151.6°的超疏水性、对碱性、酸性和盐环境的良好耐受性，以及在苛刻条件下的卓越机械耐久性。由于织物@u-FCOF的超微孔和COF涂层中的纳米孔，所得织物@u-FCOF在分离效率和渗透率方面表现出色，其中油通量高达16964 L·m·h，对邻二氯苯/水混合物的分离效率高于99.4%。此外，由于其表面的微/纳分级结构，织物@u-FCOF还表现出优异的自清洁性能。这些优异性能使其成为油水分离和水净化应用的理想候选材料。
