Hierarchical Metal-Organic Framework-Assembled Membrane Filter for Efficient Removal of Particulate Matter

ACS Applied Materials & Interfaces
Won-Tae KooIl-Doo Kim

Abstract

Here, we propose heterogeneous nucleation-assisted hierarchical growth of metal-organic frameworks (MOFs) for efficient particulate matter (PM) removal. The assembly of two-dimensional (2D) Zn-based zeolite imidazole frameworks (2D-ZIF-L) in deionized water over a period of time produced hierarchical ZIF-L (H-ZIF-L) on hydrophilic substrates. During the assembly, the second nucleation and growth of ZIF-L occurred on the surface of the first ZIF-L, leading to the formation of flowerlike H-ZIF-L on the substrate. The flowerlike H-ZIF-L was easily synthesized on various substrates, namely, glass, polyurethane three-dimensional foam, nylon microfibers, and nonwoven fabrics. We demonstrated H-ZIF-L-assembled polypropylene microfibers as a washable membrane filter with highly efficient PM removal property (92.5 ± 0.8% for PM2.5 and 99.5 ± 0.2% for PM10), low pressure drop (10.5 Pa at 25 L min-1), long-term stability, and superior recyclability. These outstanding particle filtering properties are mainly attributed to the unique structure of the 2D-shaped H-ZIF-L, which is tightly anchored on individual fibers comprising the membrane.

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Citations

Aug 25, 2020·Research : a Science Partner Journal·Ming Hui ChuaXian Jun Loh
Oct 21, 2020·Nature Reviews. Materials·Zhongmin TangWei Tao
Oct 30, 2019·ACS Applied Materials & Interfaces·Baixian WangJihong Yu
Mar 17, 2020·ACS Applied Materials & Interfaces·Sang Joon LeeSung Ho Park

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