National Synchrotron Radiation Lab, Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film, CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei 230026, China; National Co-Innovation Center for Nuclear Waste Disposal and Environmental Safety, Southwest University of Science and Technology, Mianyang 621010, China.
National Synchrotron Radiation Lab, Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film, CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei 230026, China.
J Hazard Mater. 2021 Jun 5;411:125113. doi: 10.1016/j.jhazmat.2021.125113. Epub 2021 Jan 15.
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.
为了解决饮用水安全中的氟化物问题，首次采用同步双向拉伸和羧化法大规模设计并制备了一种新型的羧基化聚丙烯腈纳米纤维膜（C-PAN NFM）。C-PAN NFM 由交联纳米纤维的层状堆叠结构组成。由于其比表面积高、亲水性好、大量的羧基和胺基，C-PAN NFM 具有高氟吸附容量和优异的选择性。C-PAN NFM 的羧化和酸处理都显著提高了其氟化物吸附容量。具体来说，C-PAN NFM 具有优异的可重复使用性，没有二次污染。C-PAN NFM 的氟化物吸附行为主要是化学吸附，吸附机制主要由氢键和离子交换驱动。大规模生产的 C-PAN NFM 是一种新型的基于聚丙烯腈的多孔膜，具有良好的效率和可回收性，在去除氟化物方面具有很大的应用潜力。
