Zeolitic-imidazolate-framework filled hierarchical porous nanofiber membrane for air cleaning

• DOI: 10.1016/j.memsci.2019.117467
• Publication Date: 2019-09-11T06:00:59Z
• Authors: Min Hu; Linghui Yin; Nicholas Low; Donghuan Ji; Yishui Liu; Jianfeng Yao; Zhaoxiang Zhong; Weihong Xing
• Keywords: 13. Climate action; 02 engineering and technology; 0210 nano-technology

Abstract 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) trap-in 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 m3 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 (