Ultra-fine SiO2 nanofilament-based PMIA: A double network membrane for efficient filtration of PM particles

Alarming levels of particulate matter (PM) in air pose a serious health threat in several countries; therefore, there is a strong need for an economic and viable technology for air filtration. In this work, a facile and green approach is proposed to fabricate a double-network membrane for efficient filtration of fine PM particles. The membrane is composed of binary hierarchical structures, including scaffold poly(m-phenylene isophthalamide) (PMIA) nanofibers, and intertwine ultra-fine SiO2 nanofilaments on its surface. The presence of SiO2 nanofilaments notably changed the morphology, specific surface area and porosity of the pristine PMIA nanofibers without reducing the mechanical strength. The PM capture measurement demonstrates that the hybrid membrane exhibited a significantly better PM capture than the bare PMIA membrane, and the removal efficiencies of PM2.5 and PM10 were 97.33% and 98.48%, respectively.

空气中令人震惊的颗粒物（PM）水平在几个国家构成了严重的健康威胁； 因此，迫切需要一种经济可行的空气过滤技术。 在这项工作中，提出了一种简便而绿色的方法来制造双网膜，以有效过滤细颗粒PM。 该膜由二元分层结构组成，包括支架聚（间亚苯基间苯二甲酰胺）（PMIA）纳米纤维，以及在其表面缠绕超细SiO2纳米丝。 SiO2纳米丝的存在显着改变了原始PMIA纳米纤维的形态，比表面积和孔隙率，而没有降低机械强度。 PM捕获测量结果表明，杂化膜比裸PMIA膜表现出明显更好的PM捕获，并且PM2.5和PM10的去除效率分别为97.33％和98.48％。

Published: 2018

Journal ：SEPARATION AND PURIFICATION TECHNOLOGY

Impact Factor：6.195

Paper link: https://www.sciencedirect.com/science/article/abs/pii/S1383586617342946