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. 2020 Sep 18;426:213544. doi: 10.1016/j.ccr.2020.213544

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Fig. 28 — (a) The proposed filtration mechanism of precursor (ZIF-8) concentration dependent PPC/ZIF8-9 membrane; the filtration efficiency and pressure drop as well as quality factor of the PPC/ZIF8-9 membrane with PM_2.5 after five consecutive filtration-wash-dry cycles (b-c); the filtration efficiency and pressure drop as well as quality factor of the PPC/ZIF8-9 membrane with PM_2.5 before and after membrane storage of 30 days (d-e). Adapted with permission from [229]. Copyright 2020 American Chemical Society.