Flexible Multifunctional Porous Nanofibrous Membranes for High-Efficiency Air Filtration

Particulate matter (PM) discharged along with the rapid industrialization and urbanization hazardously threatens ecosystems and human health. Membrane-based filtration technology has been proved to be an effective approach to capture PM from the polluted air. However, the fabrication of filtration membranes with excellent reusability and antibacterial activity has rarely been reported. Herein, the flexible multifunctional porous nanofibrous membranes were fabricated by embedding Ag nanoparticles into the electrospun porous SiO2-TiO2 nanofibers via an impregnation method, which integrated the abilities of PM filtration and antibacterial performance. Compared with the reported air filters, the resultant membrane (Ag@STPNM) with high surface polarity and porous structure possessed the low density, high removal efficiency, and small pressure drop. For instance, the removal efficiency and the pressure drop of Ag@STPNM with a basis weight of only 3.9 g m(-2) for PM2.5 reached 98.84% and 59 Pa, respectively. In terms of the excellent thermal stability of Ag@STPNM, the adsorbed PM could be removed simply by a calcination process. The filtration performance of Ag@STPNM kept stable during five purification-regeneration cycles and the long-time filtration for 12 h, exhibiting excellent recyclability and durability. Furthermore, the embedded Ag nanoparticles could achieve the effective resistance to the breeding of bacteria on Ag@STPNM, giving the bacteriostatic rate of 95.8%. Therefore, Ag@STPNM holds promising potentials as a highly efficient, reusable, and antibacterial air filter in the practical purification of the indoor environment or personal air.

随着快速工业化和城市化进程而排放的颗粒物（PM）威胁着生态系统和人类健康。基于膜的过滤技术已被证明是从污染空气中捕获PM的有效方法。但是，几乎没有报道过制造具有优异的可重复使用性和抗菌活性的滤膜。在此，通过将Ag纳米颗粒通过浸渍法嵌入到电纺多孔SiO 2 -TiO 2纳米纤维中来制造柔性多功能多孔纳米纤维膜，其整合了PM过滤的能力和抗菌性能。与报道的空气过滤器相比，所得的具有高表面极性和多孔结构的膜（Ag @ STPNM）具有低密度，高去除效率和小的压降。例如，基重仅为3.9 g m（-2）的Ag @ STPNM对PM2.5的去除效率和压降分别达到98.84％和59 Pa。就Ag @ STPNM的优异热稳定性而言，可以简单地通过煅烧工艺除去吸附的PM。 Ag @ STPNM的过滤性能在五个纯化-再生循环中保持稳定，并且经过12小时的长时间过滤，具有出色的可回收性和耐用性。此外，包埋的Ag纳米颗粒可以有效抵抗Ag @ STPNM上细菌的繁殖，抑菌率为95.8％。因此，Ag @ STPNM作为一种高效，可重复使用的抗菌空气过滤器，在室内环境或个人空气的实际净化中具有广阔的发展潜力。

Published: 2019

Journal ：ACS APPLIED MATERIALS & INTERFACES

Impact Factor：9.002

Paper link: https://pubs.acs.org/doi/abs/10.1021/acsami.9b17205