Preparation and modification of an embossed nanofibrous materials for robust filtration performance of PM0.2 removal

This work develops an embossed nanofiber membranes (ENMs) using 3D patterns for use in air mask filtration and compares this structure with a planar nanofibrous materials (PNMs). The embossed nanofiber membrane (ENM) was prepared using a combination of 3D printing and electrospinning technologies to increase the surface area of the ENM compared to that of planar structures. The surface area of the ENM was three times higher (66 m3 g−1) than that of the PNM (23 m3 g−1). The embossing structure depended on hole size and height of the grid in the 3D pattern. The pore size of the nanofiber membranes (NMs) was controlled to 0.2 μm to enable robust filtration of ultrafine airborne particle and smog pollutants. The polyamide 6 ENM achieved excellent filtration efficiency via corona surface ionic modification with (single bondCH2CHCONH2+) or anion (single bondNHCH2COO−). Ion-modification generated an electrostatic attraction or van der Waals force/repulsive force between pollutant particles and the NM surface. The dynamic particle barrier efficiency of ionic ENMs was evaluated by dynamic particle removal efficiency (%), penetration (%), resistance (mmH2O), and air permeability (m3/m2/min) tests. Well-developed pore structures and large surface area of the NM were enhanced by the embossed structure compared to that of PNM.

这项工作开发了一种3D图案的浮雕纳米纤维膜（ENM），用于空气掩模过滤，并将这种结构（EMM）与平面纳米纤维材料（PNM）进行了比较。压花纳米纤维膜（ENM）是使用3D打印和静电纺丝技术相结合制备的，与平面结构相比，可以增加ENM的表面积。 ENM的表面积（66 m3 g-1）是PNM（23 m3 g-1）的三倍。压纹结构取决于3D图案中孔的尺寸和网格的高度。纳米纤维膜（NMs）的孔径控制在0.2μm，从而能够可靠地过滤超细的空气传播颗粒和烟雾污染物。聚酰胺6 ENM通过使用（单键CH2CHCONH2 +）或阴离子（单键NHCH2COO-）进行电晕表面离子改性获得了出色的过滤效率。离子改性在污染物颗粒和NM表面之间产生静电吸引或范德华力/排斥力。通过动态粒子去除效率（％），渗透率（％），电阻（mmH2O）和透气性（m3 / m2 / min）测试评估了离子ENM的动态粒子屏障效率。与PNM相比，浮雕结构增强了NM的发达孔结构和大表面积。

Published: 2021

Journal ：JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY

Impact Factor：5.519

Paper link: https://www.sciencedirect.com/science/article/abs/pii/S1226086X20304469