Self-assembled hierarchical heterogeneous MXene/COF membranes for efficient dye separations

Lithium Pyrene Squarate Covalent Organic Frameworks for Efficient Lithium and Magnesium Separation from Salt Water

“…The adsorption properties of COFs have made them promising materials for gas separation and molecular separation in liquids . Most COFs have intrinsic pore sizes in the range of 1–3 nm, which makes them suitable for dye separation applications. − Applying the tenets learned from dye separation technology and considering the tunable nature of the pore size, the foundation for using COF membranes for the removal of specific ions from water has been established. Therefore, COFs have potential as primary components for membranes for desalination. − Although membrane technology using COFs or MOFs has already shown great success in separating Mg 2+ /Li + mixtures, − big challenge remains for the removal of small traces of Mg 2+ in the resulting mixture of Mg 2+ /Li + from initial separations.…”

Recent advances of pure/independent covalent organic framework membrane materials: preparation, properties and separation applications

“…66–68 Commonly, pre-synthesized COF powder is dispersed uniformly in water or solvent by ultrasonication, and then stacked on the substrate by vacuum filtration or dip-coating, followed by drying to prepare a continuous COF membrane. 21,25,69 In the preparation method of COF membranes, the layer by layer method is often coupled with solvothermal or interfacial polymerization methods, where COF powder or COF nanosheets exfoliated from COF powder are layer stacked on a substrate by vacuum-assisted methods.…”

Covalent Organic Frameworks: The Rising‐Star Platforms for the Design of CO2 Separation Membranes

“…[124][125][126] Ma's group fabricated a composite separation membrane via electrostatic self-assembly of positively charged COF and MXene nanosheets through charge interaction, followed by vacuum-assisted suction filtration onto mixed cellulose ester membrane for preparing MXene/COF composite membranes (Figure 8c). [127] However, it is challenging to improve the separation capability of COF membranes with various restacking while keeping the thickness constant. If it can be achieved, it can be applied to the large-scale tuning of separation performance to meet practical requirement.…”

“…Reproduced with permission. [127] Copyright 2022, Elsevier B.V. d) I) Illustrative scheme of the preparation of ultrathin COF membranes with different microstructure controls using room-temperature or heating-driven assembly and II) the effect of GO nanosheets amount when keeping CTF-BTD amount as 0.2 mg. Reproduced with permission. [128] Copyright 2021, Elsevier B.V. [134] Copyright 2019 Elsevier B.V. b) Schematic illustration of the preparation of COF-300 fillers and the fabrication of COF-300/6FDA-DAM MMMs for CO 2 /CH 4 separation.…”