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How to develop a nanofiber air filter with long-lasting antibacterial properties

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High filtration performance and antibacterial property have been the main concerns of air filters. In this work, the silver nanoparticles (AgNPs) were produced by liquid phase reduction method and were added into polyvinylidene fluoride (PVDF) solutions at a ratio of 0.2%, 0.4%, 0.6%, 0.8%, and 1% for electrospinning. Nanofibers with the tree-like structure were fabricated by controlling the processing parameters. Therefore, a tree-like AgNPs/PVDF nanofiber membrane containing AgNPs was successfully developed. The AgNPs solutions were analyzed by UV-vis absorption spectrum to determine the size of AgNPs, and the nanofiber membranes were also evaluated in terms of morphology, structure, hydrophobic property, filtration performance, and antibacterial property. The results showed that the size of AgNPs was approximately 10 nm, the average diameters of branchlike fibers and stem-like fibers were about 30.8 nm and between 90 nm with 140 nm, respectively. The addition of AgNPs did not change the hydrophobic property of the PVDF nanofiber membrane; the filtration efficiency of AgNPs/PVDF nanofiber membrane was 99.95-99.97% and the lowest pressure drop was 137.5 Pa; the bacterial reduction rates (BR) value against for S. aureus and E. roll were kept at a level of higher than 99.6% after exposure to sunlight for two weeks. Therefore, a kind of air filter with high filtration performance and durable antibacterial property was successfully developed by adding AgNPs and by creating tree-like structure fibers.

       高过滤性能和抗菌性能一直是空气过滤器的主要关注点。在这项工作中,通过液相还原法制备银纳米颗粒(AgNPs),并以0.2%,0.4%,0.6%,0.8%和1%的比例将其添加到聚偏二氟乙烯(PVDF)溶液中进行静电纺丝。通过控制工艺参数,制备出具有树状结构的纳米纤维。因此,成功开发了包含AgNPs的树状AgNPs / PVDF纳米纤维膜。通过紫外可见吸收光谱分析AgNPs溶液,以确定AgNPs的大小,并对纳米纤维膜的形态、结构、疏水性、过滤性能和抗菌性进行评估。结果表明,AgNPs的大小约为10 nm,分支状纤维和茎状纤维的平均直径分别约为30.8 nm和90 nm至140 nm。 AgNPs的添加不会改变PVDF纳米纤维膜的疏水性。 AgNPs / PVDF纳米纤维膜的过滤效率为99.95-99.97%,最低压降为137.5 Pa;暴露于阳光下两周后,金黄色葡萄球菌和大肠埃希氏菌的细菌减少率(BR)值保持在高于99.6%的水平。因此,通过添加AgNPs并制造树状结构纤维,成功地开发了一种具有高过滤性能和持久抗菌性能的空气过滤器。


Development of tree-like nanofibrous air filter with durable antibacterial property


Published: 2021

Journal :SEPARATION AND PURIFICATION TECHNOLOGY

Impact Factor:6.195

Paper link:https://www.sciencedirect.com/science/article/abs/pii/S1383586620326083


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