Aqueous Two-Phase Interfacial Assembly of COF Membranes for Water Desalination

Nano-Micro Letters, Journal Year: 2022, Volume and Issue: 14(1)

Published: Nov. 9, 2022

Aqueous two-phase system features with ultralow interfacial tension and thick region, affording unique confined space for membrane assembly. Here, the first time, an aqueous assembly method is proposed to fabricate covalent organic framework (COF) membranes. The solution containing polyethylene glycol dextran undergoes segregated phase separation into two water-rich phases. By respectively distributing aldehyde amine monomers phases, a series of COF membranes are fabricated at water-water interface. resultant exhibit high NaCl rejection 93.0-93.6% water permeance reaching 1.7-3.7 L m-2 h-1 bar-1, superior most desalination Interestingly, found have pronounced effect on structures. appropriate range (0.1-1.0 mN m-1) leads tight intact Furthermore, extended fabrication other metal-organic polymer This work exploitation fabricating in all-aqueous system, confering green generic advanced manufacturing.

Language: Английский

---

3D covalent organic framework membrane with fast and selective ion transport

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Sept. 22, 2023

3D ionic covalent organic framework (COF) membranes, which are envisioned to be able break the trade-off between ion conductivity and selectivity, waiting for exploitation. Herein, we report fabrication of a sulfonic acid-functionalized COF membrane (3D SCOF) efficient selective transport, using dual acid-mediated interfacial polymerization strategy. The SCOF membranes possess highly interconnected transport channels, ultramicroporous pore sizes (0.97 nm), abundant sulfonate groups (with high exchange capacity 4.1 mmol g-1), leading proton 843 mS cm-1 at 90 °C. When utilized in osmotic energy conversion, power density 21.2 W m-2, remarkable selectivity 0.976 thus an exceptional conversion efficiency 45.3% simultaneously achieved. This work provides alternative approach promotes applications COFs separation.

Language: Английский

---

Selective Ion Transport in Two‐Dimensional Lamellar Nanochannel Membranes

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(19)

Published: Jan. 31, 2023

Precise and ultrafast ion sieving is highly desirable for many applications in environment-, energy-, resource-related fields. The development of a permselective lamellar membrane constructed from parallel stacked two-dimensional (2D) nanosheets opened new avenue the next-generation separation technology because unprecedented diversity designable interior nanochannels. In this Review, we first discuss construction homo- heterolaminar nanoarchitectures starting materials to emerging preparation strategies. We then explore property-performance relationships, with particular emphasis on effects physical structural features, chemical properties, external environment stimuli transport behavior under nanoconfinement. also present existing potential 2D membranes desalination, recovery, energy conversion. Finally, challenges outline research directions promising field.

Language: Английский

---

Ionic Covalent Organic Framework-Based Membranes for Selective and Highly Permeable Molecular Sieving

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(4), P. 2313 - 2318

Published: Jan. 17, 2024

Two-dimensional covalent organic frameworks (COFs) with uniform pores and large surface areas are ideal candidates for constructing advanced molecular sieving membranes. However, a fabrication strategy to synthesize free-standing COF membrane high permselectivity has not been fully explored yet. Herein, we prepared TpPa-SO3H vertically aligned one-dimensional nanochannels. The introduction of the sulfonic acid groups on provides abundant negative charge sites in its pore wall, which achieve water flux an excellent performance toward water-soluble drugs dyes different charges sizes. Furthermore, exhibited long-term stability, fouling resistance, recyclability rejection performance. We envisage that this work new insights into effect ionic ligands design broad range membranes separation applications.

Language: Английский

---

Pore-in-Pore Engineering in a Covalent Organic Framework Membrane for Gas Separation

ACS Nano, Journal Year: 2023, Volume and Issue: 17(8), P. 7584 - 7594

Published: April 7, 2023

Covalent organic framework (COF) membranes have emerged as a promising candidate for energy-efficient separations, but the angstrom-precision control of channel size in subnanometer region remains challenge that has so far restricted their potential gas separation. Herein, we report an ultramicropore-in-nanopore concept engineering matreshka-like pore-channels inside COF membrane. In this concept, α-cyclodextrin (α-CD) is situ encapsulated during interfacial polymerization which presumably results linear assembly (LA) α-CDs 1D nanochannels COF. The LA-α-CD-in-TpPa-1 membrane shows high H2 permeance (∼3000 GPU) together with enhanced selectivity (>30) over CO2 and CH4 due to formation fast selective H2-transport pathways. overall performance H2/CO2 H2/CH4 separation transcends Robeson upper bounds ranks among most powerful H2-selective membranes. versatility strategy demonstrated by synthesizing different types LA-α-CD-in-COF

Language: Английский

---

Effect of interfacial polymerization monomer design on the performance and structure of thin film composite nanofiltration and reverse osmosis membranes: A review

Separation and Purification Technology, Journal Year: 2023, Volume and Issue: 330, P. 125282 - 125282

Published: Oct. 4, 2023

Language: Английский

---

Charging modulation of the pyridine nitrogen of covalent organic frameworks for promoting oxygen reduction reaction

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Feb. 29, 2024

Abstract Covalent organic frameworks (COFs) are ideal templates for constructing metal-free catalysts the oxygen reduction reaction due to their highly tuneable skeletons and controllable porous channels. However, development of active sites within COFs remains challenging limited electron-transfer capabilities weak binding affinities intermediates. Herein, we constructed catalytic centres by modulating electronic states pyridine nitrogen atoms incorporated into COFs. By incorporating different units (such as pyridine, ionic imidazole units), tuned various properties including dipole moments, reductive ability, hydrophilicity, towards Notably, COF ( im -PY-BPY-COF) exhibited greater activity than neutral (PY-BPY-COF) ion -PY-BPY-COF). Specifically, -PY-BPY-COF demonstrated a half-wave potential 0.80 V in 0.1 M KOH, outperforming other Theoretical calculations situ synchrotron radiation Fourier transform infrared spectroscopy confirmed that carbon rings improved facilitating intermediate OOH* promoting desorption OH*. This study provides new insights design metal-like catalysts.

Language: Английский

---

[2,1,3]-Benzothiadiazole-Spaced Co-Porphyrin-Based Covalent Organic Frameworks for O₂ Reduction

ACS Nano, Journal Year: 2023, Volume and Issue: 17(4), P. 3492 - 3505

Published: Feb. 8, 2023

Designing N-coordinated porous single-atom catalysts (SACs) for the oxygen reduction reaction (ORR) is a promising approach to achieve enhanced energy conversion due maximized atom utilization and higher activity. Here, we report two Co(II)-porphyrin/ [2,1,3]-benzothiadiazole (BTD)-based covalent organic frameworks (COFs; Co@rhm-PorBTD Co@sql-PorBTD), which are efficient SAC systems O2 electrocatalysis (ORR). Experimental results demonstrate that these COFs outperform mass activity (at 0.85 V) of commercial Pt/C (20%) by 5.8 times (Co@rhm-PorBTD) 1.3 (Co@sql-PorBTD), respectively. The specific activities Co@sql-PorBTD were found be 10 2.5 larger than Pt/C, These also exhibit power density recycling stability in Zn-air batteries compared with Pt/C-based air cathode. A theoretical analysis demonstrates combination Co-porphyrin different BTD ligands affords crystalline electrocatalysts having d-band center positions, leads reactivity differences toward alkaline ORR. strategy, design, electrochemical performance offer pyrolysis-free bottom-up avoids creation random atomic sites, significant metal aggregation, or unpredictable structural features.

Language: Английский

---

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

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 482, P. 148907 - 148907

Published: Jan. 21, 2024

Language: Английский

---

Ultrathin Composite Separator Based on Lithiated COF Nanosheet for High Stability Lithium Metal Batteries

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(24)

Published: Feb. 21, 2024

Abstract Lithium metal is considered as the ultimate anode material for high‐energy‐density rechargeable batteries. However, lithium batteries (LMBs) with commercial separators still face some challenges such low cycling efficiency and uncontrollable Li dendrite growth, which seriously hampers commercialization of LMBs. In this study, a novel kind ultrathin (6.2 µm) multifunctional composite separator (TpPa‐SO 3 Li@PE) designed prepared via coating lithiated covalent organic framework nanosheet Li) on surface polyethylene (PE). TpPa‐SO Li@PE integrates features nanochannel arrays abundant immobilized anionic sites, leading to efficient + conduction homogeneous flow. As result, exhibits excellent conductivity (0.96 mS cm −1 ) transference number (0.83) at room temperature, Li/Li symmetric cell using possesses highly stable plating/striping (over 2600 h) high current density (5 mA −2 ). Moreover, Li/LiFePO 4 full cells show performance (high capacity retention 94.9% after 300 cycles 1 C) superior rate specific 113.6 mAh g 5 C).

Language: Английский

---