College of Bioresources Chemical and Materials Engineering, Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, National Demonstration Center for Experimental Light Chemistry Engineering Education, Key Laboratory of Paper Based Functional Materials of China National Light Industry, Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science & Technology, Xi'an 710021, China.
College of Bioresources Chemical and Materials Engineering, Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, National Demonstration Center for Experimental Light Chemistry Engineering Education, Key Laboratory of Paper Based Functional Materials of China National Light Industry, Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science & Technology, Xi'an 710021, China.
J Hazard Mater. 2021 Jun 15;412:125260. doi: 10.1016/j.jhazmat.2021.125260. Epub 2021 Jan 29.
Air pollutions are extremely serious threats to human health and the functional hybrid filter is able to remove complicated pollutants with great potential. However, the stable structure design of hybrid filter to provide efficient filtration and adsorption performance for high temperature applications still remains a challenge. In this study, electrospun polyimide (PI) based hybrid filter was fabricated via multiple hydrogen bonding self-assembly for high-temperature air purification. In particular, Octa(amino-propylsilsesquioxane) (POSS-NH) was utilized as "bridge" for the surface activation of PI fiber, and then amino-functionalized Zeolitic Imidazolate Framework-8 (NH-ZIF-8) nanocrystals were anchored on the fiber surface through hydrogen bonding. On account of the synergistic effect of the interception effect of fibers and the electrostatic interaction of NH-ZIF-8 nanocrystals, the as-obtained PI-POSS@ZIF hybrid filter possessed excellent filtration performance with a high PM0.3 removal efficiency of 99.28% and a low pressure drop of 49.21 Pa at high temperature of 280 °C. Moreover, due to the massive micropore structure, rich open metal sites and functional groups of NH-ZIF-8, the hybrid filter exhibited prominent VOCs adsorption performance with adsorption capability of 89.95 mg/g for formaldehyde.
空气污染对人类健康构成了极大的威胁，而多功能混合过滤器具有去除复杂污染物的巨大潜力。然而，为高温应用提供高效过滤和吸附性能的混合过滤器的稳定结构设计仍然是一个挑战。在这项研究中，通过多重氢键自组装制备了用于高温空气净化的基于聚酰亚胺（PI）的电纺混合过滤器。特别地，八（氨丙基）倍半硅氧烷（POSS-NH）被用作 PI 纤维表面活化的“桥梁”，然后通过氢键将氨基功能化的沸石咪唑酯骨架-8（NH-ZIF-8）纳米晶体锚定在纤维表面上。由于纤维的拦截效应和 NH-ZIF-8 纳米晶体的静电相互作用的协同效应，所获得的 PI-POSS@ZIF 混合过滤器具有出色的过滤性能，在 280°C 的高温下，PM0.3 的去除效率高达 99.28%，压降仅为 49.21 Pa。此外，由于 NH-ZIF-8 的大量微孔结构、丰富的开放金属位和官能团，混合过滤器表现出突出的 VOCs 吸附性能，对甲醛的吸附能力为 89.95 mg/g。
