Yoo Dong Kyu, Woo Ho Chul, Jhung Sung Hwa
Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu, 41566, Republic of Korea.
ACS Appl Mater Interfaces. 2021 May 19;13(19):23092-23102. doi: 10.1021/acsami.1c02290. Epub 2021 May 10.
The elimination of particulate matters (PMs) from the air is very important for our sustainability. In this study, highly porous metal-organic frameworks (MOFs) like MIL-101 and UiO-67 were first modified, coated onto cotton, and applied in PM removal via filtration. Ionic salts (ISs) like CaCl and LiCl, after loading onto the MOFs, remarkably increased the PM removal efficiency. For example, CaCl(20)@MIL-101/cotton shows 5.7 times the quality factor (QF, which is the most important parameter in filtration) of that of bare cotton and has the most competitive performances in PM removal (with the highest QF of 0.085 Pa) compared to any filter modified with porous materials or commercial filters. The noticeable performances of ISs@MOFs can be explained by the contribution of charge separation (that is effective for electrostatic interactions with PMs) of ISs and the high porosity of MOFs. Moreover, how MOFs with small pores of a few nanometers or less can remove large PMs with sizes in the micron range could be explained. Finally, loading ISs onto highly porous materials can be a promising strategy to improve the performances of filters to remove PMs from the air.
从空气中去除颗粒物（PMs）对我们的可持续发展非常重要。在本研究中，首先对MIL-101和UiO-67等高度多孔的金属有机框架（MOFs）进行改性，涂覆在棉花上，并通过过滤应用于PM去除。负载在MOFs上的氯化钙（CaCl）和氯化锂（LiCl）等离子盐显著提高了PM去除效率。例如，CaCl(20)@MIL-101/棉花的品质因数（QF，是过滤中最重要的参数）是纯棉的5.7倍，与任何用多孔材料改性的过滤器或商业过滤器相比，在PM去除方面具有最具竞争力的性能（最高QF为0.085 Pa）。ISs@MOFs的显著性能可以通过ISs的电荷分离贡献（对与PMs的静电相互作用有效）和MOFs的高孔隙率来解释。此外，还可以解释具有几纳米或更小的小孔的MOFs如何去除微米范围内尺寸的大PMs。最后，将ISs负载到高度多孔材料上可能是一种提高过滤器从空气中去除PMs性能的有前途的策略。
