Li Xiaoqi, Wang Na, Fan Gang, Yu Jianyong, Gao Jing, Sun Gang, Ding Bin
Key Laboratory of Textile Science & Technology, Ministry of Education, College of Textiles, Donghua University, Shanghai 201620, China.
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
J Colloid Interface Sci. 2015 Feb 1;439:12-20. doi: 10.1016/j.jcis.2014.10.014. Epub 2014 Oct 18.
Development of technologies for air filtration and purification is critical to meet the global challenges of threatened human health and accelerated greenhouse effect, especially for point-of-use applications. Here, we report a novel electreted polyetherimide-silica (PEI-SiO2) fibrous membrane by a single-step strategy to achieve effective filtration of fine particles. The hierarchical structured PEI-SiO2 membranes were endowed with promising superhydrophobicity with a water contact angle of 152°, allowing their better self-cleaning performance compared with commercial polypropylene (PP) filter media. Morphology, electric charge property, porous structure, and filtration performance could be regulated by tuning the type and concentration of electrets as well as the solution properties. Furthermore, unlike the commercial PP-based filter media, the as-prepared membranes can be treated at 200°C for 30min without sacrificing filtration efficiency (99.992%) and pressure drop (61Pa) owing to the combined contribution of polarization and space charges. We anticipate that this promising electreted fibrous medium will act as a core part of numerous air filtration systems, including ultra-low penetration air filters, clean room, respirator, and protective clothing.
开发空气过滤和净化技术对于应对威胁人类健康和加速温室效应的全球挑战至关重要，特别是对于使用点应用而言。在此，我们报告了一种通过单步策略制备的新型驻极体聚醚酰亚胺 - 二氧化硅（PEI-SiO₂）纤维膜，以实现对细颗粒的有效过滤。具有分级结构的PEI-SiO₂膜具有152°的水接触角，具有良好的超疏水性，与商业聚丙烯（PP）过滤介质相比，具有更好的自清洁性能。通过调节驻极体的类型和浓度以及溶液性质，可以调控膜的形态、电荷性质、多孔结构和过滤性能。此外，与商业PP基过滤介质不同，由于极化和空间电荷的共同作用，所制备的膜在200°C下处理30分钟后，过滤效率（99.992%）和压降（61Pa）不会受到影响。我们预计这种有前景的驻极体纤维介质将成为众多空气过滤系统的核心部件，包括超低渗透空气过滤器、洁净室、呼吸器和防护服。
