(a) Proposed capture mechanism of the MOF-based filter for air pollutants. Inset is the SEM image of the surface of the MOF/polymer composite fibre. (b) MOF filters based on various flexible substrates produced by a roll-to-roll hot-pressing method. (c–e) SEM images of the ZIF-8@plastic mesh achieved after seven layer-by-layer coating cycles. Reprinted with permission from Ref. [159
] and Ref. [156
]. Copyright 2016 and 2017, the American Chemical Society and WILEY-VCH.