Eliminating lattice defects in metal–organic framework molecular-sieving membranes

Enhancing Nanofiltration Selectivity of Metal–Organic Framework Membranes via a Confined Interfacial Polymerization Strategy

“…14,15 Liu et al reported the elimination of lattice defects in MOF membranes based on a high-probability theoretical coordination strategy to achieve efficient molecular sieving. 16 Compared with these effective but intricate methods, the construction of lamellar membranes using 2D MOF nanosheets can be more facile and convenient to obtain tailored membrane permeability and selectivity. 17−22 The synergetic effect of van der Waals forces and electrostatic interactions between the adjacent MOF nanosheets can bring about sturdy transport channels that could separate molecules efficiently through the adsorption and sieving effect.…”

“…The precise control of the microstructure of MOF membranes is the key and difficulty to attaining satisfactory separation performance. For example, Dong et al developed high-performance pervaporation MOF membranes for desalination by the delicate regulation of intercrystalline and intracrystalline defects of MOFs. , Liu et al reported the elimination of lattice defects in MOF membranes based on a high-probability theoretical coordination strategy to achieve efficient molecular sieving . Compared with these effective but intricate methods, the construction of lamellar membranes using 2D MOF nanosheets can be more facile and convenient to obtain tailored membrane permeability and selectivity. − The synergetic effect of van der Waals forces and electrostatic interactions between the adjacent MOF nanosheets can bring about sturdy transport channels that could separate molecules efficiently through the adsorption and sieving effect.…”

Recent advancements in supramolecular macrocycles for two-dimensional membranes for separations

“…[34][35][36][37] In contrast, MOF-based membranes often separate ions or molecules based on their intrinsic pores. [38][39][40] Accordingly, the face-to-face stacking of 2D nanosheets (e.g., GO) may create an interlayer channel that is too small, thereby reducing the transmission rate. The separation of molecules or ions by a 2D membrane sieve, such as a MOF membrane, usually requires functionalization in their inherent pores to improve selectivity.…”

Solid-solvent processing of ultrathin, highly loaded mixed-matrix membrane for gas separation

“…Despite their dominance in the market, polymeric membranes generally do not possess regular and continuous subnanometer channels, leading to an inherent trade-off between permeability and selectivity ( 3 ). Nanoporous crystalline materials, represented by zeolites and metal-organic frameworks (MOFs), can address this challenge by providing excellent permeability and selectivity through their well-defined pore systems ( 4 – 6 ). With existing pure crystalline membranes, it remains difficult to control intergranular defects and maintain their processability toward large-scale implementation ( 7 ).…”