Computational design of 2D functional covalent–organic framework membranes for water desalination

Zhang, Kang; He, Zhongshi; Gupta, Krishna M.; Jiang, Jianwen

doi:10.1039/c7ew00074j

Cited by 71 publications

(85 citation statements)

References 38 publications

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“…Meanwhile, 400 nm–5 μm films were prepared by drop‐casting suspensions of equivalent concentrations (Figure A, Figure S12). Such fine control of film thickness has not been achieved by interfacial polymerization or solvothermal synthetic methods, thus making this approach ideal for fabricating membranes for chemical‐separation applications, where the film thickness and pore size define the performance of the material …”

Section: Resultsmentioning

confidence: 99%

Acid Exfoliation of Imine‐linked Covalent Organic Frameworks Enables Solution Processing into Crystalline Thin Films

et al. 2020

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Covalent organic frameworks (COFs) are highly modular porous crystalline polymers that are of interest for applications such as charge‐storage devices, nanofiltration membranes, and optoelectronic devices. COFs are typically synthesized as microcrystalline powders, which limits their performance in these applications, and their limited solubility precludes large‐scale processing into more useful morphologies and devices. We report a general, scalable method to exfoliate two‐dimensional imine‐linked COF powders by temporarily protonating their linkages. The resulting suspensions were cast into continuous crystalline COF films up to 10 cm in diameter, with thicknesses ranging from 50 nm to 20 μm depending on the suspension composition, concentration, and casting protocol. Furthermore, we demonstrate that the film fabrication process proceeds through a partial depolymerization/repolymerization mechanism, providing mechanically robust films that can be easily separated from their substrates.

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Section: Resultsmentioning

confidence: 99%

Acid Exfoliation of Imine‐linked Covalent Organic Frameworks Enables Solution Processing into Crystalline Thin Films

et al. 2020

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“…[254] Zhang et al computationally designed a series of 2D functional TpPa-1 COF and found that hydrophilic functional groups are essential in improving water permeance with an over 98% salt rejection. [255] To promote the sieving effects and mechanical strength of COF membranes, 1D cellulose nanofibers (CNFs) were integrated into the membrane (Figure 12c). [247] The pore size (0.45-1.0 nm) that rendered membrane precise molecular sieving ability was obtained.…”

Section: Desalinationmentioning

confidence: 99%

Emerging Functional Porous Polymeric and Carbonaceous Materials for Environmental Treatment and Energy Storage

Zheng

Lin

Zhang

et al. 2019

Adv Funct Materials

200

118

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The demand for practical and cost-effective environmental treatment and energy storage materials is exploding. Porous polymeric and carbonaceous materials have attracted tremendous interest on account of their welldeveloped porosity and tunable surface chemistry. Functionalization of pore structures further enhances their properties for environmental treatment and energy storage. Herein, the procedures for functionalization of porous structures are introduced, including predesign and postsynthetic strategies. Subsequently, the important advancements of emerging porous polymers for environmental treatment in sorption (e.g., organic micropollutant adsorption, heavy metal ion removal, radionuclide extraction, and oil absorption) and membrane separation (e.g., aqueous micropollutant separation, organic solvent nanofiltration, desalination and pervaporation), as well as for energy storage ranging from the electrodes and separators of batteries to supercapacitor electrodes are highlighted. Moreover, given the combined merits of high intrinsic conductivity, porosity, and physicochemical stability, novel polymer-based porous carbons for energy storage are also highlighted. Key functionalization chemistry for each application is discussed and an in-depth understanding of the structure-property relationships of these functional porous materials is provided. Finally, the challenges and perspectives of emerging functional porous polymeric and carbonaceous materials for environmental treatment and energy storage are proposed.

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“…Such fine control of film thickness has not been achieved by interfacial polymerization or solvothermal synthetic methods, [11,18,24] thus making this approach ideal for fabricating membranes for chemical-separation applications,w here the film thickness and pore size define the performance of the material. [44][45][46] Crystalline films were fabricated from two additional imine-linked COF powders (TAPB-PDACOF,Methyl COF, Schemes S2, S3), thereby establishing the generality of the method. In each case,the pristine COF powder was exfoliated through stirring and sonication in the presence of TFA.…”

Section: Resultsmentioning

confidence: 99%

Acid Exfoliation of Imine-linked Covalent Organic Frameworks Enables Solution Processing into Crystalline Thin Films

Burke¹,

Sun²,

Castano³

et al. 2019

Preprint

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Covalent organic frameworks (COFs) are highly modular porous crystalline polymers that are of interest for applications such as charge-storage devices,n anofiltration membranes,a nd optoelectronic devices.C OFs are typically synthesized as microcrystalline powders,w hichl imits their performance in these applications,a nd their limited solubility precludes large-scale processing into more useful morphologies and devices.W er eport ag eneral, scalable method to exfoliate two-dimensional imine-linked COF powders by temporarily protonating their linkages.T he resulting suspensions were cast into continuous crystalline COF films up to 10 cm in diameter,w ith thicknesses ranging from 50 nm to 20 mmd epending on the suspension composition, concentration, and casting protocol. Furthermore,w ed emonstrate that the film fabrication process proceeds through ap artial depolymerization/repolymerization mechanism, providing mechanically robust films that can be easily separated from their substrates.

show abstract

Computational design of 2D functional covalent–organic framework membranes for water desalination

Abstract: A computational study is reported for water desalination through 2D covalent–organic framework membranes.

Cited by 71 publications

References 38 publications

Acid Exfoliation of Imine‐linked Covalent Organic Frameworks Enables Solution Processing into Crystalline Thin Films

Acid Exfoliation of Imine‐linked Covalent Organic Frameworks Enables Solution Processing into Crystalline Thin Films

Emerging Functional Porous Polymeric and Carbonaceous Materials for Environmental Treatment and Energy Storage

Acid Exfoliation of Imine-linked Covalent Organic Frameworks Enables Solution Processing into Crystalline Thin Films

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