2023
DOI: 10.1002/smll.202303757
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Continuous Covalent Organic Frameworks Membranes: From Preparation Strategies to Applications

Abstract: Covalent organic frameworks (COFs) are porous crystalline polymeric materials formed by the covalent bonding of organic units. The abundant organic units library gives the COFs species diversity, easily tuned pore channels, and pore sizes. In addition, the periodic arrangement of organic units endows COFs regular and highly connected pore channels, which has led to the rapid development of COFs in membrane separations. Continuous defect‐free and high crystallinity of COF membranes is the key to their applicati… Show more

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Cited by 30 publications
(17 citation statements)
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References 200 publications
(220 reference statements)
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“…Additionally, their excellent thermal/chemical stability endows them with the quintessential characteristics of ideal filler materials. [26] COF MMMs are often fabricated via the integration of pre-synthesized COFs into porous polymer matrices, creating additional pores to maintain or enhance the water flux while simultaneously enhancing the separation/ removal of smaller molecules through enhanced adsorptive/ selective intermolecular interactions resulting from the in-creased surface area coverage of desired functionalities introduced through these fillers. [21,31,32] On the other hand, COF-based TFC membranes have also been widely adopted for water treatment.…”
Section: Fabrication Methods Of Cof Composite Membranesmentioning
confidence: 99%
See 1 more Smart Citation
“…Additionally, their excellent thermal/chemical stability endows them with the quintessential characteristics of ideal filler materials. [26] COF MMMs are often fabricated via the integration of pre-synthesized COFs into porous polymer matrices, creating additional pores to maintain or enhance the water flux while simultaneously enhancing the separation/ removal of smaller molecules through enhanced adsorptive/ selective intermolecular interactions resulting from the in-creased surface area coverage of desired functionalities introduced through these fillers. [21,31,32] On the other hand, COF-based TFC membranes have also been widely adopted for water treatment.…”
Section: Fabrication Methods Of Cof Composite Membranesmentioning
confidence: 99%
“…[15,23,24] Consequently, membrane separation has emerged as a growing application field for COFs in water treatment. [25][26][27][28] Not surprisingly, the number of publications on COF membranes has increased exponentially over the past few years, indicating a consensus regarding the utilization of COFs for the fabrication of membranes. [29] Recent studies have focused on synthetic methodologies and separation applications of COF membranes.…”
Section: Introductionmentioning
confidence: 99%
“…They are crystalline, nanoporous 2D materials characterized by pore dimensions typically falling within the range of 0.5 to 4.7 nm. 76 These frameworks are constructed through the covalent bonding of organic linkers, a feature that allows for precise adjustment of pore sizes. This adjustment can be achieved by employing organic linkers of varying lengths or by introducing functional groups to these organic linkers.…”
Section: Performance Metrics Of 2d Laminated Membranesmentioning
confidence: 99%
“…Polysulfone is one of the most prevalent polymers for membrane casting due to its outstanding mechanical, high thermal, and excellent chemical stability with relatively low cost and suitable flux. It is hydrophobic, but hydrophilicity can be enhanced by adding inorganic filler into a membrane with a wide aperture adjustment range. , Poly­(vinylpyrrolidone) (PVP) is a nonconducting, biocompatible, and nontoxic polymer with an excellent performing agent and is known as one of the most used membrane additives. It is soluble in polar solvents with good adhesion and applied as a morphology controller. ,, It also enhanced the viscosity of the casting solution and leached out into the water during membrane synthesis . Due to being hydrophilic, it enhances the antifouling properties of polymer membranes. , Due to its good performance, epichlorohydrin (ECH) is a cationic water-soluble additive that provides permanent wet strength in alkaline conditions.…”
Section: Introductionmentioning
confidence: 99%