Freestanding Metal Organic Framework‐Based Multifunctional Membranes Fabricated via Pseudomorphic Replication toward Liquid‐ and Gas‐Hazards Abatement

Metal organic framework (MOF)‐based adsorptive membranes are attractive materials in high flux separation and/or in abatement of hazardous materials. However, fabrication of continuous MOF membrane with ultra‐high loading and anti‐solvent property is a challenging task. Here, the authors report a coordination replication synthetic approach via a morphological replacement procedure that employs pre‐shaped Al2O3 microfiltration membrane to produce freestanding MOF multifunctional membrane (FMMMs). The authors achieve precise control of crystal size, morphology, and orientation on the FMMMs. Moreover, the intrinsic porous structure inherited from Al2O3 pre‐fabricated membrane and newly introduced MOF active sites synergistically contribute to a great rejection (99%) of organic dyes from organic solvent with a permeability over 175 L m−2 h−1 bar−1. Furthermore, the as‐synthesized FMMMs enable heterogeneous HCHO catalytic oxidation and extremely rapid 2‐chloroethyl ethyl sulfide (CEES) detoxification. This work opens the way to design high‐performance FMMMs from pre‐shaped membranes for various applications. Al‐based freestanding metal‐organic frameworks (MOFs) multifunctional membranes (FMMMs) are produced via coordination replication approach. The obtained FMMMs show excellent performances, including good mechanical strength, high flux and selectivity, great organic solvent stability and reproducibility. Notably, this synthetic approach can be extended to other alumina‐based MOFs, indicating its promising practical implementation and versatility against both liquid‐ and gas‐ phase chemical hazards.