Zeolitic-imidazolate-framework filled hierarchical porous nanofiber membrane for air cleaning
Zeolitic-imidazolate-framework filled hierarchical porous nanofiber membrane for air cleaning
复制标题
用于空气净化的沸石-咪唑酯骨架填充分级多孔纳米纤维膜
DOI：
10.1016/j.memsci.2019.117467
复制
发表时间：
2020-01-15
影响因子：
9.5
通讯作者：
Xing, Weihong
中科院分区：
文献类型：
--
作者：
Hu, Min;Yin, Linghui;Xing, Weihong
颗粒物（PM）和化学气态污染物（SO2、NOx、VOCs）对环境的严重影响已成为全球性的大气问题。寻求一种既能有效去除颗粒物又能有效去除其他污染物的方法是迫切的，也是一个挑战。本文中，我们介绍了一种沸石咪唑骨架（ZIF-67）捕获聚苯乙烯多级多孔膜（ZIF-67/PS HPNFM），用于PM和SO2的过滤。通过控制分级多孔结构，我们实现了具有显著低阻力的高效和多功能的空气净化膜。由纳米纤维交织的大孔提供1489 m（3）m（-2）h（-1）kPa（-1）的高气体渗透性，这确保了91 Pa的低压降。同时，填充的ZIF-67增强了PM捕获，使得ZIF-67/PS HPNFM显示出99.921%的非常高的PM（< 0.3 μ m）去除效率。每个微孔中的中孔提供了将SO2引导至ZIF-67的气体渗透通道。此外，来自ZIF-67的微孔显著提高了表面积（236 m2 g-1）和孔隙率（0.259 cm 3 g-1），这导致在室温和55%湿度下良好的SO2吸附容量（1362 mg g-1）。多功能多级孔结构膜为协同去除多种空气污染物提供了新的思路。
Severe environmental impact caused by particulate matters (PM) and chemical gaseous pollutants (SO2, NOx, VOCs) has become a global atmospheric issue. Seeking an effective way for both PM removal and other pollutants is urgent and remains a challenge. Herein, we introduced a zeolitic imidazolate framework (ZIF-67) trapin polystyrene hierarchical porous nanofiber membrane (ZIF-67/PS HPNFM) for both PM and SO2 filtration. By controlling the hierarchical porous structure we achieve highly-effective and multi-functional air cleaning membrane that has remarkably low resistance. The macropores interwoven by nanofibers offer high gas permeance of 1489 m(3) m(-2) h(-1) kPa(-1) which ensure a low pressure drop of 91 Pa. Meanwhile, the filled ZIF-67 enhanced the PM capture so that the ZIF-67/PS HPNFM showed a very high PM (< 0.3 mu m) removal efficiency of 99.921%. The mesopores in each nanofiber provided the gas permeating channels that direct SO2 to ZIF-67. Further, the micropores from ZIF-67 dramatically enhanced the surface area (236 m(2) g(-1)) and porosity (0.259 cm(3) g(-1)) which resulted in a good SO2 adsorption capacity (1362 mg g(-1)) at room temperature and humidity of 55%. The hierarchical porous structure membrane with multifunction provides a new concept for synergistic removal of various air contaminants.