ACCURATE MOLECULAR SIEVING IN MONOLAYER METAL-ORGANIC FRAMEWORK MEMBRANES
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Membrane-based separations are crucial to replace energy-intensive separation processes; however, engineering chemically stable membranes with precise control over pore size remains challenging under harsh, industrially relevant conditions. Cross-linked polymeric membranes have demonstrated potential for organic solvent nanofiltration (OSN), owing to their chemical stability, high porosity, and permeability, but they often suffer from low selectivity due to difficulty in controlling the micro-void architectures. Here, we reported wafer-scale fabrication of ultra-thin cross-linked polyamide membranes with a metal-organic framework (MOF) monolayer as the selective layer. The ultrahigh porosity and crystallinity of the MOF enabled precise separation of molecules at the sub-nanometer scale. These MOF-polyamide bilayer membranes resulted in 2.5x higher selectivity and a fourfold increase in permeance compared to state-of-the-art OSN membranes.