Nanoporous PLA/(Chitosan Nanoparticle) Composite Fibrous Membranes with Excellent Air Filtration and Antibacterial Performance

Particulate matter (PM) pollution, which usually carries viruses and bacteria, has drawn considerable attention as a major threat to public health. In this present study, an environment-friendly antibacterial Poly(lactic acid)(PLA)/chitosan composite air filter was fabricated using the one-step electrospinning technique. The composite PLA/chitosan fibres show a highly porous structure, in which chitosan nanoparticles (NPs) were found to be uniformly distributed throughout the entire fibre. The morphologies, through-pore size and distribution, air filtration and anti-microbial properties of these filter media were studied. The results showed that it was not the chitosan content but instead the concentration of the spinning solutions that had the greatest effect on the morphologies of the porous fibres. The relative humidity influenced the nanometre-scale pores on the surface of PLA/chitosan fibres. The PLA/chitosan fibrous membranes with a chitosan to PLA mass ratio of 2.5:8 exhibited a high filtration efficiency of 98.99% and a relatively low pressure drop (147.60 Pa) when the air flow rate was 14 cm/s, while these also had high antibacterial activity of 99.4% and 99.5% against Escherichia coli and Staphylococcus aureus, respectively. It took 33 min for the PM2.5 concentration to decrease to 0 mu g/m(3) from 999 mu g/m(3) using the PLA/chitosan fibrous membranes, which demonstrates obviously effective air purification performance.

通常携带病毒和细菌的颗粒物（PM）污染已成为引起公众健康的主要威胁，受到了广泛的关注。在本研究中，采用一步静电纺丝技术制备了一种环保型抗菌聚乳酸（PLA）/壳聚糖复合空气滤清器。 PLA /壳聚糖复合纤维显示出高度多孔的结构，其中发现壳聚糖纳米颗粒（NPs）均匀分布在整个纤维中。研究了这些过滤介质的形态，通孔尺寸和分布，空气过滤和抗菌性能。结果表明，不是壳聚糖含量，而是纺丝溶液的浓度对多孔纤维的形态影响最大。相对湿度影响PLA /壳聚糖纤维表面的纳米级孔。壳聚糖与PLA的质量比为2.5：8的PLA /壳聚糖纤维膜在空气流速为14 cm / s时显示出98.99％的高过滤效率和相对较低的压降（147.60 Pa），而它们也具有对大肠杆菌和金黄色葡萄球菌的高抗菌活性分别为99.4％和99.5％。使用PLA /壳聚糖纤维膜，PM2.5浓度从999μg / m（3）花费了33分钟降低到0μg / m（3），表现出明显的有效空气净化性能。

Published: 2018

Journal ：CARBOHYDRATE POLYMERS

Impact Factor：7.641

Paper link: https://www.mdpi.com/2073-4360/10/10/1085