Carbon Capture Science & Technology
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2023
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IF 0
Wufeng Wu,Jiang Fan,Dongyue Wang,Yali Zhao,Xinglei Zhao,Yanying Wei
MOF membranes exhibit impressive performance in gas separation due to their large surface area, controllable pore size and unique affinity. Here, the ultrathin UiO-66-NH 2 polycrystalline membranes with thickness of ∼320 nm are successfully prepared within 1 h using a combination of ultrasound-assisted and microwave synthesis strategies. During the reaction, high-density small MOF nuclei are produced by sodium formate ultrasound-assisted, which act as sufficient nucleation sites for heterogeneous nucleation during membrane growth, aiming for development of a continuous MOF membrane on the porous substrate. The obtained UiO-66-NH 2 membrane shows an ideal CO 2 /CH 4 selectivity of 40 due to the enhanced the interaction between CO 2 molecules and the membrane. Moreover, the narrowed pore structure further hinders the diffusion of larger-sized molecules owing to -NH 2 occupying the pore channels, resulting in elevated CO 2 /CH 4 selectivity. Compared to many other MOF membranes, the UiO-66-NH 2 polycrystalline membranes exhibit a well balance of gas permeance and CO 2 /CH 4 selectivity, which presents a new route for CO 2 capture.
研究领域:
材料科学
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化学工程
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环境科学
✓ 已验证
DOI
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Yutao Liu,Mingang Zhao,Yanxiong Ren,Hong Wu,Juntao Lu,Yunchuan Pu,Jianyu Wang,Xu Liang,Guangwei He,Zhongyi Jiang
Metal organic framework (MOF) membranes have exhibited great potential for efficient gas separation owing to their excellent chemical and structural tunability. To realize CO 2 separation from flue gas, linker modification or exchange is generally required to functionalize MOF membranes. However, the reported linker-exchanged polycrystalline MOF membranes have not yet achieved attractive CO 2 separation performance due to the sacrificed permeance of the overly reduced pore apertures when employing bulky linkers. Herein, we report a 3-amino-1,2,4-triazole (Atz)-exchanged polycrystalline ZIF-8 membrane (Atz-ZIF-8) with Atz molar ratios ranging from 3% to 29% which shows an excellent CO 2 /N 2 separation performance that significantly surpasses that of other linker-exchanged ZIF-8 membranes. The as-synthesized Atz-ZIF-8 membranes possess additional uncoordinated amines for CO 2 -preferential adsorption, resulting in an excellent CO 2 /N 2 selectivity of 29. What's more, the size and configuration of Atz is similar to 2-methylimidazole (2-mIm), so the window size of Atz-ZIF-8 membranes is not significantly reduced, and thus high CO 2 permeance (690 GPU) is achieved. Considering the superior performance and accessible manufacturing process, we conclude that our work could provide guidelines on designing advanced linker-exchanged ZIF-8 based polycrystalline membranes towards post-combustion carbon capture.
研究领域:
材料科学
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
·
IF 9
Hammad Saulat,Weiquan Feng,Zhongzhuang Hu,Mengxing He,Jinming Lu,Yan Zhang,Jianhua Yang,Cheng He
Separation of butane isomers holds substantial importance across various industrial sectors due to their divergent chemical characteristics and pervasive applications. Their efficient separation into high-purity iso-butane (i-C 4 ) and normal butane (n-C 4 ) allows their optimal utilization while maximizing economic benefit and minimizing waste, though their separation presents significant challenges due to their similar physicochemical properties and energy-intensive separation requirements. Polycrystalline zeolite-based membrane separation processes emerge as an energy-efficient approach for separating butane isomers by reducing the total operating energy consumption as compared to the conventional distillation process. However, the fabrication cost of polycrystalline zeolite membranes is high, predominantly dictated by the production cost of the support (≈ 50-70 %) rather than the polycrystalline zeolite layer. Herein, we report the fabrication of polycrystalline MFI membranes on inexpensive coarse macroporous α-Al 2 O 3 tube supports (symmetrical supports) with an average pore size in the range of 2 ∼ 3μm for separating butane isomers. Macroporous α-Al 2 O 3 tube supports are coated with single (sheet-like MFI crystals) and dual (sheet-like MFI crystals + MFI crystals) seed layers to achieve the desired separation performances. For coating a single seed layer, MFI nanocrystals were employed as precursors for synthesizing sheet-like MFI crystals with a high aspect ratio as compared to the conventional MFI crystals. Taking advantage of the high aspect ratio of sheet-like MFI crystals, single seed layer was fabricated on coarse macroporous α-Al 2 O 3 tube support, eliminating the time-intensive steps to reduce the support pore size and reducing the problem of pore plugging. Subsequently, a dual seed layer (sheet-like MFI crystals + MFI crystals) was also created by hot dip coating the MFI crystals on the surface of a single seed layer with the aim of fabricating a more compact, continuous, and molecular sieving polycrystalline MFI membrane with enhanced separation performance for the separation butane isomers. After hydrothermal crystallization, polycrystalline MFI membrane (M-2) fabricated on a single seed layer exhibits a separation factor and n-butane permeance of 33.80 and 2.00x10 -7 mol/m 2 .Pa.s, respectively. In contrast, the polycrystalline MFI membrane (D-3) formed on a dual seed layer demonstrates a separation factor and n-butane permanence of 40.60 and 1.47x10 -7 mol/m 2 .Pa.s, respectively. Both these membranes demonstrate good stability and reproducibility. Fabrication of polycrystalline MFI membranes on inexpensive coarse macroporous tube supports is a crucial advancement in reducing fabrication costs and facilitating industrial implementation. However, substantial potential remains for further scaling up and enhancing the separation performance of current polycrystalline MFI membranes.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Cell Reports Physical Science
·
2024
·
IF 7.9
Haiyang Wu,Yang Li,Langyuan Wu,Zhiwei Li,Yimin Xing,Dewei Xiao,Zengjie Fan,Xiaogang Zhang
Zinc-ion batteries (ZIBs) have faced persistent challenges related to dendrite growth and the hydrogen evolution reaction (HER). Herein, a metal-organic framework (MOF) polycrystalline membrane is introduced into the realm of ZIB research, motivated by the remarkable separation capabilities exhibited by MOF membranes. A MOF polycrystalline membrane is constructed on the Zn anode through liquid-phase epitaxial growth at room temperature. Aberration-corrected scanning transmission electron microscopy (AC-STEM) analysis unequivocally verifies the ingress of Zn 2+ into the MOF cavities, subsequently leading to the reconstitution of the solvation sheath. Profiting from the close contact between the membrane and the Zn anode, the Zn 2+ are reduced to Zn 0 directly in the cavities of the MOF after entering. This behavior effectively regulates the deposition trajectory of Zn 2+ and eliminates the potential for secondary solvation. Leveraging the efficient separation and ion-confinement capabilities of the MOF, the Zn anode incorporating the metal-azolate framework-4 (MAF-4) membrane demonstrates notable inhibition of the HER and suppression of dendrite formation.
研究领域:
材料科学
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电化学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Jianghai Long,Xiansong Shi,Zhe Zhang,Tong Ju,Qinghua Liu,Yong Wang
Crystalline covalent organic framework (COF) membranes with well-defined architectures are critical for sustainable separation technologies. However, conventional synthetic routes relying on straightforward monomer condensation often fall short in producing COF membranes with superior crystallographic order. Here, the ambient-condition synthesis of COF-LZU1 polycrystal monolayer membranes is reported via imine-exchange chemistry. By employing aniline as a monofunctional modulator, the crystallization pathway is shifted from direct imine formation to a kinetically regulated imine-exchange process. This modulation suppresses rapid nucleation and mitigates both intra- and intercrystalline defects, yielding structurally distinctive membranes composed of polycrystal monolayers. The method is compatible with various substrates and enables facile fabrication of COF-LZU1 polycrystal monolayer separation membranes. Membrane morphology and crystallinity can be fine-tuned by adjusting the volumes of aniline and acetic acid. The optimized COF-LZU1 membrane performs exceptional molecular sieving in osmosis-driven separation, achieving efficient purification of pharmaceuticals from their precursors with operational stability over 500 h. This work provides a powerful strategy for developing unambiguously crystalline COF membranes and reveals the significance of crystallinity in advancing COF-based membrane technologies.
研究领域:
材料科学
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膜分离技术
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制药工程
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纳米材料
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化学工程
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晶体工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Haiqian Lian,Eryue Song,Bin Bao,Wenhe Yang,Yu Yang,Yichang Pan,Shengui Ju
Metal-organic frameworks (MOFs) as molecular sieve membrane materials have received extensive attention on the gas separation application. However, the membrane separation performance is extremely limited by its intrinsic stability of frameworks. The successful preparation of high-quality gas separation membranes with excellent stability remains a grand challenge. ZIF-302 is based on hydrophobic ligand in-situ design with a high-stabile chabazite (CHA) topology. Herein, we synthesized uniform ZIF-302 nanocrystals with exceptional stability by introducing a modulator. Correspondingly, the continuous dense ZIF-302 polycrystalline membranes were also prepared for the separation of H 2 , N 2 , CO 2 , CH 4 and other gases. The permeance of H 2 and separation factor for H 2 /CH 4 mixtures at 35 °C and 1 bar were 2.8 × 10 -8 mol m −2 s −1 Pa −1 and 51.5, respectively, exceeding the Robeson upper bound in 2008. Furthermore, the separation performance of the super-hydrophobic ZIF-302 membranes for humidified mixed gases can maintain more than 168 h at 35 °C, indicating reliable long-term operational stability. Therefore, the CHA-type ZIF-302 polycrystalline membrane is promising for actual industrial gas separation.
研究领域:
材料科学
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化学工程
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膜技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2022
·
IF 10.53
Jiang Fan,Wufeng Wu,Zong Lu,Yanying Wei
The Metal-Organic Framework (MOF) materials are ideal molecular sieving membrane materials due to the regular pores with high-density and good designability, which have been widely studied in gas separation, desalination, and nanofiltration , etc. However, most preparation methods of MOF polycrystalline membranes are always time-consuming and the as-synthesized MOF membranes are thick. Here in this work, the ultrathin 210 nm-UiO-66 polycrystalline membranes are rapidly synthesized in 1 h, where sonication is utilized to generate massive tiny nucleation followed with rapid microwave-assisted membrane growth. The Na + rejection of the UiO-66 membrane maintains at 99.6% for 700 h long-term experiment with 0.16 L/(m 2 h bar) of water flux in forward osmosis, indicating the good quality and excellent stability of the as-synthesized membrane. This strategy is also expected to synthesize many other continuous defect-free MOF membranes with ultrathin thickness rapidly.
研究领域:
材料科学
·
化学工程
·
膜技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）