Metal-coordinated sub-10 nm membranes for water purification

You, Xinda; Wu, Hong; Zhang, Runnan; Su, Yanlei; Cao, Li; Yu, Qianqian; Yuan, Jinqiu; Xiao, Ke; He, Mingrui; Jiang, Zhongyi

doi:10.1038/s41467-019-12100-0

Cited by 119 publications

(83 citation statements)

References 38 publications

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“…Nevertheless, because of the broad pore size distribution and the small hydration radii of Cl − , the ion rejection rates for MgCl 2 and NaCl were relatively low. The separation mechanism of the membranes was dominated by a size-sieving/Donnan exclusion collaborative effect (46). The surface of the pDA/TpPa(W/E)-COF membrane was negatively charged; therefore, the Donnan repulsion effect for SO 4 2− was stronger than that for Cl − , and the hydration radius of Cl − was smaller than that of SO 4 2− (47).…”

Section: Resultsmentioning

confidence: 99%

Molecularly soldered covalent organic frameworks for ultrafast precision sieving

et al. 2021

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The weak interlamellar interaction of covalent organic framework (COF) nanocrystals inhibit the construction of highly efficient ion/molecular sieving membranes owing to the inferior contaminant selectivity induced by defects in stacked COF membranes and stability issues. Here, a facile in situ molecularly soldered strategy was developed to fabricate defect-free ultrathin COF membranes with precise sieving abilities using the typical chemical environment for COF condensation polymerization and dopamine self-polymerization. The experimental data and density functional theory simulations proved that the reactive oxygen species generated during dopamine polymerization catalyze the nucleophilic reactions of the COF, thus facilitating the counter-diffusion growth of thin COF layers. Notably, dopamine can eliminate the defects in the stacked COF by soldering the COF crystals, fortifying the mechanical properties of the ultrathin COF membranes. The COF membranes exhibited ultrafast precision sieving for molecular separation and ion removal in both aqueous and organic solvents, which surpasses that of state-of-the-art membranes.

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Section: Resultsmentioning

confidence: 99%

Molecularly soldered covalent organic frameworks for ultrafast precision sieving

et al. 2021

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“…Further issues related to water are the behaviour of oil films [3], the synthesis of nano-materials for medical applications [4,5], the behaviour of two-dimensional materials [6], and the behaviour of colloidal suspensions [7,8]. The functional mechanism of membranes [9,10] is also a relevant class. The description of all these systems requires good knowledge of the dielectric function of water on the real frequency axis as well as, for calculation of van der Waals interactions, imaginary frequencies.…”

Section: Introductionmentioning

confidence: 99%

Full-Spectrum High-Resolution Modeling of the Dielectric Function of Water

et al. 2020

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In view of the vital role of water in chemical and physical processes, an exact knowledge of its dielectric function over a large frequency range is important. In this article we report on currently available measurements of the dielectric function of water at room temperature (25 • C) across the full electromagnetic spectrum: microwave, IR, UV and X-ray (up to 100 eV). We provide parameterisations of the complex dielectric function of water with two Debye (microwave) oscillators and high resolution of IR and UV/X-ray oscillators. We also report dielectric parameters for ice-cold water with a microwave/IR spectrum measured at 0.4 • C, while taking the UV spectrum from 25 • C (assuming negligible temperature dependence in UV). We illustrate the consequences of the model via calculations of van der Waals interactions of gas molecules near water surfaces, and an assessment of the thickness of water films on ice and ice films on water. In contrast to earlier models of ice-cold water, we predict that a micron-scale layer of ice is stabilised on a bulk water surface. Similarly, the van der Waals interaction promotes complete freezing rather than supporting a thin premelting layer of water on a bulk ice surface. Density-based extrapolation from warm to cold water of the dielectric function at imaginary frequencies is found to be satisfactory in the microwave but poor (40% error) at IR frequencies.

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“…Membrane-based separation offers a scalable, economically and environmentally friendly tool for numerous applications, e.g., biochemical and pharmaceutical processing, water purication, and wastewater treatment. [1][2][3][4][5] Although the interest in developing high-performance membranes has been growing from diverse inorganic, organic, and composite materials, [6][7][8][9][10][11][12][13] a longstanding goal in membrane technology is still to pursue an ideal membrane with a high permeance, good selectivity and strong fouling resistance.…”

Section: Introductionmentioning

confidence: 99%