Patterned nanofiber air filters with high optical transparency, robust mechanical strength, and effective PM(2.5)capture capability

PM2.5, due to its small particle size, strong activity, ease of the attachment of toxic substances and long residence time in the atmosphere, has a great impact on human health and daily production. In this work, we have presented patterned nanofiber air filters with high optical transparency, robust mechanical strength and effective PM(2.5)capture capability. Here, to fabricate a transparency air filter by a facile electrospinning method, we chose three kinds of patterned wire meshes with micro-structures as negative receiver substrates and directly electrospun polymer fibers onto the supporting meshes. Compared with randomly oriented nanofibers (named "RO NFs" in this paper) and commercially available facemasks, the patterned air filters showed great mechanical properties, and the water contact angles on their surfaces were about 122-143 degrees (the water contact angle for RO NFs was 81 degrees). In addition, the patterned nanofibers exhibited high porosity (>80%), and their mean pore size was about 0.5838-0.8686 mu m (the mean pore size of RO NFs was 0.4374 mu m). The results indicate that the transparent patterned air filters have the best PM(2.5)filtration efficiency of 99.99% at a high transmittance of similar to 69% under simulated haze pollution.

PM2.5由于其颗粒小、活性强、容易附着有毒物质和在大气中的居住时间长等原因，对人体健康和日常生产产生了很大影响。在这项工作中，我们提出了具有高光学透明度、强健的机械强度和有效的PM（2.5）捕获能力的纳米纤维空气过滤器图案。在这里，为了通过简便的静电纺丝方法制造透明空气过滤器，我们选择了三种具有微结构的图案线网作为负接收器基材，并将电纺聚合物纤维直接固定在支撑网上。与随机定向纳米纤维（本文中命名为"RO NFs"）和市售面罩相比，图案空气滤清器显示出极强的机械性能，其表面的水接触角度约为122-143度（RO NFs的水接触角为81度）。此外，图案纳米纤维表现出高孔隙度（>80%），其平均孔径约为0.5838-0.8686亩（RO NF的平均毛孔尺寸为0.4374亩）。结果表明，透明图案空气过滤器在模拟雾霾污染下的传输效率最高，为99.99%，PM（2.5）过滤效率最高，接近69%。  

Published: 2020

Journal ：RSC Advances

Impact Factor：3.267

Paper link: https://pubs.rsc.org/az/content/articlehtml/2020/ra/d0ra01967d