Preparation and Properties of PVDF/Fe3O4 Nanofibers with Magnetic and Electret Effects and their Application in Air Filtration

With the aggravation of particulate matter (PM) pollution, critical requirements including intercepting the fine particles effectively and trapping biological pollutants have been proposed for the air filtration material. In this study, multilayer structured membranes with excellent air filtration performance and antibacterial ability were fabricated via sequential electrospinning. A novel N-halamine biopolymer, P(ADMH-NVF), was first synthesized via a free-radical copolymerization of N-Vinylformamide (NVF) and 3-allyl-5,5-dimethylhydantoin (ADMH), and combined with polyvinyl alcohol (PVA) as a middle layer (PVA/P(ADMH-NVF)). Polyvinyl alcohol/ chitosan electrospun membranes (PVA/CS) were then orderly assembled onto both sides of the (PVA/P(ADMH-NVF)) membranes to form multilayer membranes. In the filtration test, the multilayer electrospun nanofibrous membranes showed high filtration efficiencies of 99.3% for sodium chloride (NaCl) and 99.4% for Diisooctyl sebacate (DEHS) aerosol. In addition, the multilayer electrospun nanofibrous membranes hold a relatively low pressure drop of 183 Pa for NaCl and 238 Pa for DEHS aerosol, as well as a high tensile strength of 6.1 MPa. For the antibacterial test, the multilayer electrospun nanofibrous membranes exhibited excellent antibacterial abilities against both Gram-negative bacteria E. coli and Gram-positive bacteria S. aureus. It is expected that these multilayer electrospun nanofibrous membranes containing N-halamine will have wide application prospects in air filtration.

随着颗粒物（PM）污染的加剧，所以对于空气过滤材料的功能，包括有效地拦截细颗粒和捕获生物污染物。在这项研究中，通过顺序电纺丝制备了具有出色的空气过滤性能和抗菌能力的多层结构膜。新型N-卤胺生物聚合物P（ADMH-NVF）首先通过N-乙烯基甲酰胺（NVF）和3-烯丙基-5,5-二甲基乙内酰脲（ADMH）的自由基共聚反应合成，然后与聚乙烯醇（ PVA）作为中间层（PVA / P（ADMH-NVF））。然后将聚乙烯醇/壳聚糖电纺膜（PVA / CS）有序组装到（PVA / P（ADMH-NVF））膜的两侧，以形成多层膜。在过滤测试中，多层电纺纳米纤维膜对氯化钠（NaCl）和癸二酸二异辛酯（DEHS）气溶胶显示出99.3％的高过滤效率。另外，多层电纺纳米纤维膜具有相对低的压降（对于NaCl为183Pa，对于DEHS气雾剂为238Pa）以及6.1MPa的高拉伸强度。对于抗菌测试，多层电纺纳米纤维膜对革兰氏阴性细菌大肠杆菌和革兰氏阳性细菌金黄色葡萄球菌均表现出优异的抗菌能力。预期这些包含N-卤胺的多层电纺纳米纤维膜将在空气过滤中具有广阔的应用前景。

Published: 2020

Journal ：APPLIED SURFACE SCIENCE

Impact Factor：6.386

Paper link: https://www.sciencedirect.com/science/article/abs/pii/S0169433220307182