Journal of CO2 Utilization
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2024
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IF 7.2
Heming Deng,Haoshuang Gu
Two-dimensional membranes are considered the next generation separation membrane with great application potential due to their excellent separation performance, good mechanical strength and thermal stability compared with traditional membrane materials. In this work, the flexible NH 2 -UIO-66@MXene membrane was successfully prepared for gas separation by loading NH 2 -UIO-66 particles onto Ti 3 C 2 nanosheets based on an in-situ growth strategy. A LiF-HCl mixed solution was used as the etchant to obtain the Ti 3 C 2 nanosheets. The loading of NH 2 -UIO-66 particles can regulate the interlayer spacing of Ti 3 C 2 nanosheets, improving the specific surface area of Ti 3 C 2 and the adsorption capacity for specific gases. The -NH 2 group in NH 2 -UIO-66 enabled preferential adsorption of CO 2 over H 2 , and the CO 2 molecules adsorbed in the channel can even block the molecules passing through, increasing the resistance of CO 2 diffusion. As a result, the NH 2 -UIO-66@Ti 3 C 2 hybrid membrane realizes the selective separation of H 2 /CO 2 mixed gas, and the separation selectivity is as high as 155. The gas separation selectivity and permeation of the final prepared NH 2 -UIO-66@MXene were enhanced and exceeded the upper limit of Robeson upper bound (2017).
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2018
·
IF 3.306
Jiamin Hou,Yanying Wei,Sheng Zhou,Yanjie Wang,Haihui Wang
We propose a strategy for rapid in situ fabrication of zeolitic imidazolate framework-8 (ZIF-8) hybrid membrane with assistance of the two dimensional (2D) graphitic carbon nitride (g-C 3 N 4 ) nanosheets at room temperature. The negatively charged g-C 3 N 4 nanosheets with abundant nitrogen coordinating sites are capable to capture and anchor Zn 2+ and thus provide a large number of heterogeneous nucleation sites for the formation of initial ZIF-8 crystals. During the cyclical spin coating of the Zn 2+ /g-C 3 N 4 nanosheets and the ligand (2-methylimidazole), the in situ formed ZIF-8 crystal nucleus on g-C 3 N 4 nanosheets promote the further growth of continues defect-free membranes. The ZIF-8/g-C 3 N 4 membrane with thickness of ∼240 nm can be obtained using this strategy within 30 min at room temperature, which is attractive for fast and facile preparation of molecular sieving membranes. Moreover, it exhibits promising H 2 /CO 2 separation performance with the selectivity up to 42, which is superior to many other ZIF-8 membranes.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Qian Yu,Bilin Liang,Siqi Jia,Fang Li,Qiming Li
A novel approach was developed to fabricate defect-free MIL-96 membranes on an α-Al 2 O 3 support by combining aluminum isopropoxide coating with mixed-solvent regulation. The aluminum isopropoxide gel on the support functions as an active Al source, directing MIL-96 crystal nucleation and growth. A subsequent secondary crystallization can produce a well-intergrown MIL-96 membrane. Here, the gel coating inhibits the preferential crystallization of MIL-96 particles in the support pores, optimizing the microstructure and diminishing inter-crystal defects. By accurately adjusting the formic acid to N-methylformamide ratio in synthesis solution, a balance between membrane crystallinity and formation is achieved. Membrane separation property evaluation revealed an outstanding H 2 permeance of 1800 GPU and an H 2 /CO 2 separation factor of over 24.0, outperforming some advanced polycrystalline MOF membranes. This approach provides a potentially cost-efficient method for the large-scale preparation of MIL-96 membranes, holding great potential for practical applications in membrane separation.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Fangfang Yang,Mian Wu,Yuchao Wang,Saeed Ashtiani,Heqing Jiang
Metal–organic framework (MOF) nanosheets have emerged as promising materials for the construction of molecular sieve membranes due to their nanoscale thickness and highly oriented pore arrays. However, the development of defect-free MOF nanosheet membranes from rigid MOF nanosheets with efficient permselectivity and robust mechanical strength still remains a big challenge. Herein, we develop a facile GO-induced assembly strategy to design continuous and uniform two-dimensional MOF composite membranes, in which the copper 1,4-benzene dicarboxylate (CuBDC) nanosheets present a layer-stacking arrangement. With the assistance of flexible GO, the voids between the junctions of rigid MOF nanosheets are well-repaired, and the interlayer bonding interactions are strengthened, resulting in the fabrication of a continuous nanosheet membrane with robust mechanical strength. The obtained MOF nanosheet-based membranes display remarkable H2/CO2 separation performance with a superior H2 permeance of 9.6 × 10–7 mol m–2 s–1 Pa–1 and an ideal separation selectivity of 95.1 due to the well-defined size exclusion effect, showing great promise for H2 separation and purification. The repair strategy described here could also provide the blueprint for the development of other nanosheet-based membranes.
研究领域:
材料科学
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化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Science Advances
·
2023
·Vol. 9
·期 24
·
IF 13.6
Meng Zhao,Dong-Dong Zhou,Pin Chen,Yujie Ban,Yuecheng Wang,Ziyi Hu,Yutong Lu,Mu-Yang Zhou,Xiao-Ming Chen,Weishen Yang
Hydrogen/carbon dioxide (H 2 /CO 2 ) separation for sustainable energy is in desperate need of reliable membranes at high temperatures. Molecular sieve membranes take their nanopores to differentiate sizes between H 2 and CO 2 but have compromised at a marked loss of selectivity at high temperatures owing to diffusion activation of CO 2 . We used molecule gatekeepers that were locked in the cavities of the metal-organic framework membrane to meet this challenge. Ab initio calculations and in situ characterizations demonstrate that the molecule gatekeepers make a notable move at high temperatures to dynamically reshape the sieving apertures as being extremely tight for CO 2 and restitute with cool conditions. The H 2 /CO 2 selectivity was improved by an order of magnitude at 513 kelvin (K) relative to that at the ambient temperature.
研究领域:
膜科学
·
材料科学
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能源可持续性
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气体分离
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计算化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2023
·
IF 9.5
Shuyue Pang,Yanhong Li,Xiaofang Chen,Aisheng Huang
The fabrication of mixed matrix membranes (MMMs) by intermixing suitable fillers with organic polymers is an effective strategy to surmount the well-known trade-off effect between gas permeability and selectivity, which can promote separation performance of membranes to a great extent. Two-dimensional (2D) metal-organic frameworks (MOFs) are considered as potential fillers for strengthening the separation performance of MMMs as they possess high aspect ratio and distinctive chemical characteristics. However, it remains challenging in engineering the morphology of the MOFs with desired pore structure and high aspect ratio. In this study, we firstly prepare c-axis oriented ZIF-95 sheets with lateral dimension exceeding 22 μm and thickness of around 3 μm by the solvothermal method. And then the ZIF-95 sheets are incorporated into the polyimide (PI) matrix to fabricate highly c -axis oriented ZIF-95@PI MMMs (denoted as COZIF-95@PI MMMs thereafter). Attributing to the straight permeation channel of ZIF-95 (3.6 Å) for gas permeation as well as its high compatibility with polyimide substrates, the COZIF-95@PI MMMs show a high gas separation capability. At 373 K and 100 kPa for the COZIF-95@PI MMM with 40 wt% loading, the mixture separation factors of H 2 /CH 4 and H 2 /CO 2 are 134 and 58, respectively, and the H 2 permeability exceeds 967 barrer , which is hopeful for the separation and purification of hydrogen.
研究领域:
材料科学
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化学工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Peng Li,Chao Ma,Ning Li,Chi Tang,Zhaolin Lv,Zhenjie Gu,Zhihua Qiao,Chongli Zhong
Metal-organic framework (MOF) membranes have demonstrated significant potential in replacing traditional polymer membranes for gas separation. However, synergistically enhancing gas permeance and selectivity remains challenging in MOF membrane design, particularly when framework pore apertures surpass gas kinetic diameters. Here, an innovative strategy is reported for engineering ultrathin ZIF-8 membranes with chemical adsorption sites via polymer bidirectional induction. The polyethyleneimine (PEI)-Zn 2+ interface layer facilitated the formation of ultrathin ZIF-8 membranes (~78.4 nm) by guiding small-sized crystal growth. Meanwhile, the competitive coordination of PEI with 2-methylimidazole induced the pendant of partially coordinated ligands in the ZIF-8 cavity to form chemisorption sites. This structural alteration enabled the in-situ chemical adsorption of CO 2 in the cavity of ZIF-8, thus contracting the window apertures and enhancing the molecular sieving efficiency. As a result, the ultrathin ZIF-8 membrane exhibited an excellent H 2 /CO 2 ideal selectivity of 34.2 with a remarkable H 2 permeance of 7143.6 GPU in single-gas tests, outperforming other reported ZIF-8 membranes. During mixed-gas H 2 /CO 2 testing, the in situ structural changes demonstrated robust pressure-performance stability and long-term gas separation capability. This work advances the development of ZIF-8 membranes for efficient separation of H 2 /CO 2 , and offers a feasible design principle and theoretical guidance for MOF-based gas separation membranes.
研究领域:
材料科学
·
化学工程
·
膜技术
·
气体分离
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2024
·
IF 5.1
Yu Zhang,Feng Zhang,Shuqi Liu,Lele Guo,Zhenggong Wang,Jian Jin
High-performance polymer-based H2/CO2 separation membranes are attractive for sustainable blue hydrogen production. However, achieving high-flux separation remains a challenge, as H2 and CO2 have similar diffusion rates within the polymer. In this work, hydrogen-bonded polyamide (PA) network membranes are synthesized through interfacial polymerization involving Tröger’s base diamine (TBDA) and 1,3,5-benzenetricarbonyl trichloride, aiming to enhance the efficiency of H2/CO2 separation. Incorporating the contorted TBDA unit into the PA structure enhances microporosity, which, in turn, boosts the H2 permeance of the PA membrane. Notably, the presence of numerous intermolecular hydrogen bonds between N atoms in the TBDA and H atoms in the amide groups helps to restrict the pore size further, thereby improving the H2/CO2 selectivity of the membrane. The resulting PA membrane demonstrates an outstanding H2/CO2 selectivity of 23.5, coupled with a high H2 permeance of 160 gas permeation unit (GPU), significantly exceeding the current upper bound. Additionally, our PA membranes maintain a stable H2/CO2 selectivity of approximately 21.5 and a H2 permeance of around 160 GPU over 100 h, indicating excellent long-term stability. These findings suggest that the development of such advanced polymer membranes could pave the way for more efficient and sustainable blue hydrogen production, overcoming existing limitations in gas separation technologies.
研究领域:
材料科学
·
化学工程
·
可持续能源
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）