To deal with the drinking water safety caused by fluoride, a novel carboxylated polyacrylonitrile nanofibrous membrane (C-PAN NFM) is designed and fabricated massively for the first time by adopting synchronously biaxial stretching and carboxylation. The C-PAN NFM is composed of the layered stack structure by cross-linked nanofibers. Due to its high specific surface area, excellent hydrophilicity, a large amount of carboxyl and amine groups, C-PAN NFM owns high fluoride adsorption capacity and outstanding selectivity. Both the carboxylation and acid treatment of C-PAN NFM improved the fluoride adsorption capacity remarkably. Specifically, C-PAN NFM shows excellent reusability without secondary pollution. The fluoride adsorption behavior of C-PAN NFM is dominated by chemical adsorption, and the adsorption mechanism is mainly driven by hydrogen bonding and ion exchange. The mass-produced C-PAN NFM is a novel polyacrylonitrile-based porous membrane that shows a great application potential for fluoride removal with good efficiency and recyclability.

为了解决氟化物引起的饮用水安全问题，首次采用同步双轴拉伸和羧化技术，首次大规模设计并制造了一种新型的羧化聚丙烯腈纳米纤维膜（C-PAN NFM）。C-PAN NFM由交联的纳米纤维组成的叠层结构组成。由于其高的比表面积，出色的亲水性，大量的羧基和胺基，C-PAN NFM具有高的氟化物吸附能力和出色的选择性。C-PAN NFM的羧化和酸处理均显着提高了氟化物的吸附能力。具体而言，C-PAN NFM显示出极好的可重复使用性，而没有二次污染。C-PAN NFM的氟化物吸附行为受化学吸附的支配，吸附机理主要由氢键和离子交换驱动。大量生产的C-PAN NFM是一种新型的基于聚丙烯腈的多孔膜，具有很高的效率和可回收性，在氟化物去除方面具有巨大的应用潜力。