Hydrophilicity gradient in covalent organic frameworks for membrane distillation

Two‐Dimensional Metal‐Organic Frameworks and Covalent Organic Frameworks

“…[ 106 ] Recently, Wang et al . [ 107 ] reported a method of using engineering defects in COF membranes to prepare membrane distillation membranes composed of channels with hydrophilicity gradient and pore size gradient by removing imine bonds. In addition to the anti‐pollution and anti‐wetting capabilities of the COF membrane on the support, under the conditions of an absolute pressure of 16 kPa and a feed temperature of 85 °C, the water flux could reach 600 L·m –2 ·h –1 , which was three times that of the most advanced membrane distillation membrane used for seawater desalination.…”

“…(e) Atomic force microscopy image and cross‐sectional scanning electron microscopy image of COF DT ‐E18 film. [ 107 ] Copyright 2021, Springer Nature.…”

Solvent‐Influenced Fragmentations in Free‐Standing Three‐Dimensional Covalent Organic Framework Membranes for Hydrophobicity Switching

“…In this regard, a simple and one‐step facile method to tune the hydrophobicity of membrane is fundamentally attractive and highly useful for technology transfer. Recently, a reversible covalent bonding strategy has been adopted for constructing a hydrophilic‐hydrophobic gradient 2D‐COF thin‐film membrane for distillation‐based desalination of water, which shows the staggering importance of such research [7] …”

Racemic Porous Organic Cage Crystal with Selective Gas Adsorption Behaviors

“…[1] Therefore, different approaches have been developed to generate diverse porous crystalline materials such as zeolites, [1,3,[7][8][9] metal-organic frameworks (MOFs), [10][11][12][13][14][15][16][17][18][19] and covalent organic frameworks (COFs). [20][21][22][23] In particular, zeolites with uniform micropores can be regarded as a kind of aluminosilicates, playing a very important role in the practical applications including catalysis, separation and ion exchange. [1] MOFs and COFs with high surface areas and flexible structure tailorability seem to possess advantages over zeolites not only in the traditional applications perspectives, but also in the fields of photoelectronics and semiconductors.…”

“…[1] MOFs and COFs with high surface areas and flexible structure tailorability seem to possess advantages over zeolites not only in the traditional applications perspectives, but also in the fields of photoelectronics and semiconductors. [10][11][12][13][14][15][16][17][18][19][20][21][22][23] However, to date, the synthesis challenge has been still encountered yet to obtain desired porous materials with controllable size, shape and uniformity of the porosity.…”