Biomimetic construction of smart nanochannels in covalent organic framework membranes for efficient ion separation

Ren, Liang; Chen, Jianxin; Han, Jian; Liang, Jinsheng; Wu, Hong

doi:10.1016/j.cej.2024.148907

Cited by 13 publications

(3 citation statements)

References 53 publications

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“…After the charging process was completed, the peak of N–Li disappeared and the peak intensity of N–PF 6 − recovered. 46 Moreover, the ex situ FT-IR spectra also exhibit a similar reversible change (Fig. 3i).…”

Section: Resultsmentioning

confidence: 62%

“…Compared with the reactants (Pz and TAPP), the disappearance of the typical peak at 1678 cm −1 due to the CO vibration band of Pz and the typical peak at 3450–3300 cm −1 due to the N–H vibration band of TAPP further proves the accomplishment of the condensation reaction. 44 In addition, the –OH vibration band, which often appears at 3300–3100 cm −1 , 45,46 is not observed in the FTIR spectrum of TAPP-Pz-COF. In the solid-state 13 C cross-polarization magic-angle-spinning nuclear magnetic resonance ( 13 C MAS NMR) spectrum of TAPP-Pz-COF, the signal at 162.1 ppm is assigned to the imine bond (Fig.…”

Section: Resultsmentioning

confidence: 96%

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A bipolar-type covalent organic framework on carbon nanotubes with enhanced density of redox-active sites for high-performance lithium-ion batteries

Xu,

Liu,

Jin

et al. 2024

Energy Environ. Sci.

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Section: Resultsmentioning

confidence: 62%

Section: Resultsmentioning

confidence: 96%

A bipolar-type covalent organic framework on carbon nanotubes with enhanced density of redox-active sites for high-performance lithium-ion batteries

Xu,

Liu,

Jin

et al. 2024

Energy Environ. Sci.

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“…Specifically, the effect of electrostatic interaction is amplified due to the increased Bjerrum length and the decrease in the dielectric coefficient in nanoconfined spaces . These intriguing features have motivated scientists to design biomimetic nanochannels with comparable charge regulation to achieve both rapid and precision ion transportation, which is practically significant but technically challenging. ,, …”

mentioning

confidence: 99%

Ion-Selective Transport Promotion Enabled by Angstrom-Scale Nanochannels in Dendrimer-Assembled Polyamide Nanofilm for Efficient Electrodialysis

Wu,

Gan,

Lin

et al. 2024

Nano Lett.

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The ion permeability and selectivity of membranes are crucial in nanofluidic behavior, impacting industries ranging from traditional to advanced manufacturing. Herein, we demonstrate the engineering of ion-conductive membranes featuring angstrom-scale ion-transport channels by introducing ionic polyamidoamine (PAMAM) dendrimers for ion separation. The exterior quaternary ammonium-rich structure contributes to significant electrostatic charge exclusion due to enhanced local charge density; the interior protoplasmic channels of PAMAM dendrimer are assembled to provide additional degrees of free volume. This facilitates the monovalent ion transfer while maintaining continuity and efficient ion screening. The dendrimer-assembled hybrid membrane achieves high monovalent ion permeance of 2.81 mol m −2 h −1 (K + ), reaching excellent mono/multivalent selectivity up to 20.1 (K + /Mg 2+ ) and surpassing the permselectivities of state-of-the-art membranes. Both experimental results and simulating calculations suggest that the impressive ion selectivity arises from the significant disparity in transport energy barrier between mono/multivalent ions, induced by the "exterior− interior" synergistic effects of bifunctional membrane channels.

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Efficient Ion Screening Boosted by MOF/COF Bilayer Membrane Through Multiple Separation Mechanisms

Ma,

Liu,

et al. 2024

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Porous organic frameworks (POFs), including metal‐organic frameworks (MOFs) and covalent organic frameworks (COFs), have drawn attention as ion‐selective materials due to their well‐defined channels and functional sites. However, their individual limitations require novel approaches to maximize their potential. In this study, a hybrid bilayer membrane combining MOFs and COFs on a nylon substrate via consecutive liquid‐liquid interface polymerization is developed. This method forms robust chemical bonds between the MOF and COF layers, creating efficient ion transport channels. The integration of ZIF‐8 (MOF layer), which exhibits strong electrostatic repulsion against cations, with TpPa‐SO3H (COF layer), offering strong cation coordination, results in a synergistic effect that significantly enhances ion separation. The ZIF‐8/TpPa‐SO3H/nylon membrane achieved a Li+/Mg2+ separation ratio of 501, which is 400 times higher than the pristine ZIF‐8 membrane and 200 times higher than the TpPa‐SO3H membrane. This outstanding performance is due to the combined electrostatic repulsion of the MOF layer and functional coordination of the COF layer, enabling precise ion discrimination. The membrane's structural integrity and chemical stability further contribute to its superior ion separation efficiency, making it a promising candidate for large‐scale lithium extraction from salt lakes.

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Biomimetic construction of smart nanochannels in covalent organic framework membranes for efficient ion separation

Cited by 13 publications

References 53 publications

A bipolar-type covalent organic framework on carbon nanotubes with enhanced density of redox-active sites for high-performance lithium-ion batteries

A bipolar-type covalent organic framework on carbon nanotubes with enhanced density of redox-active sites for high-performance lithium-ion batteries

Ion-Selective Transport Promotion Enabled by Angstrom-Scale Nanochannels in Dendrimer-Assembled Polyamide Nanofilm for Efficient Electrodialysis

Efficient Ion Screening Boosted by MOF/COF Bilayer Membrane Through Multiple Separation Mechanisms

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