Polyamide Covalent Organic Framework Membranes for Molecular Sieving

Lu, Ya; Zhou, Zhi-Bei; Qi, Qiao-Yan; Yao, Jin; Zhao, Xin

doi:10.1021/acsami.2c07753

Cited by 22 publications

(20 citation statements)

References 45 publications

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“…The nanoindentation technique was employed to analyze the nanomechanical properties of these COF membranes. 56 As depicted in Figure 5d, all of the load−depth (P−h) curves…”

Section: ■ Results and Discussionmentioning

confidence: 94%

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Covalent Organic Framework Membrane with Angstrom Discrimination in Pore Size for Highly Permselective Ionic Liquid Nanofiltration

Gao,

Guo,

Wan

et al. 2023

ACS Sustainable Chem. Eng.

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Recycling water-soluble ionic liquids (ILs) from dilute aqueous solutions using nanofiltration membranes has garnered substantial attention due to the potential environmental impact and relatively high cost associated with ILs, which limit sustainable development. However, conventional polyamide nanofiltration membranes exhibit less attractive separation performance, limiting their widespread adoption. In this study, we present, for the first time, a series of covalent organic framework (COF) membranes designed with angstrom-level pore size discrimination and highly tunable charge distribution on the membrane surface for the nanofiltration of water-soluble IL at a concentration of 0.05 mol L −1 . These COF membranes demonstrate exceptional IL rejection rates (>90%) and outstanding cycling stability by combining precisely controlled pore size and a negatively charged membrane surface. Mechanistic studies reveal that angstromlevel pore size discrimination enhances the molecular sieve process, and the tunable surface charge distribution enhances electrostatic repulsion. Furthermore, the remarkable nanomechanical properties of the COF membranes ensure their durability. This work underscores the feasibility of engineering the pore size and charge properties of COF membranes at the molecular level to achieve high-performance IL nanofiltration.

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“…The nanoindentation technique was employed to analyze the nanomechanical properties of these COF membranes. 56 As depicted in Figure 5d, all of the load−depth (P−h) curves…”

Section: ■ Results and Discussionmentioning

confidence: 94%

“…The nanoindentation technique was employed to analyze the nanomechanical properties of these COF membranes . As depicted in Figure d, all of the load–depth ( P – h ) curves exhibit no noticeable discontinuities with increasing load, suggesting the absence of local plastic deformation during testing.…”

Section: Resultsmentioning

confidence: 99%

Covalent Organic Framework Membrane with Angstrom Discrimination in Pore Size for Highly Permselective Ionic Liquid Nanofiltration

Gao,

Guo,

Wan

et al. 2023

ACS Sustainable Chem. Eng.

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“…Synthetic polyamide is used to create nylon membranes. 100 Although, there is a range of pore widths that can successfully catch MPs, they vary in size. For the purpose of removing MPs from water samples, nylon membranes are utilized.…”

Section: Membrane Filtration Techniques For Mps Extractionmentioning

confidence: 99%

A Critical Review on Current Challenges in the Analysis of Microplastics in Food Samples

Bhavsar,

Dongare,

Shimada

et al. 2023

ACS Food Sci. Technol.

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This Review critically focuses on the current challenges in analyzing microplastics (MPs) in solid and liquid samples, particularly in food products with the greatest potential for MPs contamination. Our literature review revealed that many researchers have used mild to harsh chemical solutions for the digestion of interfering matrixes during the extraction of MPs from several types of food samples. Polyethylene, polystyrene, poly(ethylene terephthalate), and polypropylene are the four main types of polymers found in food. MPs identification techniques such as FT-IR, SEM, and Raman spectroscopy are also discussed in detail. This Review narrows the gap in selecting a suitable membrane for the extraction and identification of MPs from various types of food matrixes. The present review generalizes the combination of techniques that are better suited for the detection of MPs in food and provides awareness of the presence of MPs in food samples and their toxicities.

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“…According to previous reports, several reaction types have been successfully applied to the interfacial synthesis of 2D COFs or 2D polymer films, such as Schiff base condensation, azide-alkyne cycloadditions, Glaser-Hay coupling reactions, [2 + 2] photocycloaddition, and so on [ 48 , 49 , 50 , 51 ]. Dichtel’s groups reported the interfacial polymerization of monomers capable of forming imine-linked 2D COF films at liquid/liquid interfaces.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Synthesis of an Ultrathin Two-Dimensional Polymer Film via [2 + 2] Photocycloaddition

et al. 2023

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A carbon–carbon-linked, ultrathin, two-dimensional (2D) polymer film was prepared at the air/water interface through photochemically triggered [2 + 2] cycloaddition. The preorganization of the monomers on the water surface and the subsequent photo-polymerization led to the successful preparation of the ultrathin 2D polymer film. The obtained film is continuous, free standing, and has a large area (over 50 μm2). Transmission electron microscopy (TEM) and atomic force microscopy (AFM) give clear evidence of the ultrathin film morphology. Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) indicate successful photo-induced [2 + 2] polymerization.

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Polyamide Covalent Organic Framework Membranes for Molecular Sieving

Cited by 22 publications

References 45 publications

Covalent Organic Framework Membrane with Angstrom Discrimination in Pore Size for Highly Permselective Ionic Liquid Nanofiltration

Covalent Organic Framework Membrane with Angstrom Discrimination in Pore Size for Highly Permselective Ionic Liquid Nanofiltration

A Critical Review on Current Challenges in the Analysis of Microplastics in Food Samples

Interfacial Synthesis of an Ultrathin Two-Dimensional Polymer Film via [2 + 2] Photocycloaddition

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