纳米纤维
膜
过滤(数学)
材料科学
化学工程
聚酰亚胺
空气过滤器
纳米技术
化学
入口
数学
生物化学
机械工程
统计
工程类
图层(电子)
作者
Yu Liu,Dan Wang,Guogang Xu,Li Qiao,Yong Li,Hongyu Gong,Lei Shi,Dongwei Li,Meng Gao,Guoran Liu,Jingjing Zhang,Wenhui Wei,Xingshuang Zhang,Xiu Liang
标识
DOI:10.3389/fchem.2021.810861
摘要
Air and water pollution poses a serious threat to public health and the ecological environment worldwide. Particulate matter (PM) is the major air pollutant, and its primary sources are processes that require high temperatures, such as fossil fuel combustion and vehicle exhaust. PM0.3 can penetrate and seriously harm the bronchi of the lungs, but it is difficult to remove PM0.3 due to its small size. Therefore, PM0.3 air filters that are highly efficient and resistant to high temperatures must be developed. Polyimide (PI) is an excellent polymer with a high temperature resistance and a good mechanical property. Air filters made from PI nanofibers have a high PM removal efficiency and a low air flow resistance. Herein, zeolitic imidazolate framework-8 (ZIF-8) was used to modify PI nanofibers to fabricate air filters with a high specific surface area and filtration efficiency. Compared with traditional PI membranes, the ZIF-8/PI multifunction nanofiber membranes achieved super-high filtration efficiency for ultrafine particles (PM0.3, 100%), and the pressure drop was only 63 Pa. The filtration mechanism of performance improvement caused by the introduction of ZIF-8/PI nanofiber membrane is explored. Moreover, the ZIF-8/PI nanofiber membranes exhibited excellent thermal stability (300 C) and efficient water-oil separation ability (99.85%).
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