RSC Advances
·
2021
·Vol. 11
·期 46
·28863-28875
·
IF 3.361
Yu Qin,Li Xu,Liying Liu,Xiaoyu Deng,Yucheng Gao,Zhongwei Ding
A novel gas separation approach is proposed in this work by combining an amine-based solid adsorbent with a zeolitic imidazolate framework-8 (ZIF-8) membrane. This was achieved by incorporating the amine-based solid adsorbent during the fabrication of the ZIF-8 membrane on a macroporous substrate. An amine-based solid adsorbent was prepared using porous ZIF-8-3-isocyanatopropyltrimethoxysilane (IPTMS) and N-[(3-trimethoxysilyl)propyl]diethylenetriamine (3N-APS) amine compounds. The as-prepared porous amine-based solid adsorbent (denoted as ZIF-8-IPTMS-3N-APS) possessed excellent adsorptive CO2/N2 and CO2/CH4 separation performances. As the adsorbent needs to be regenerated, this could indicate that the CO2 adsorption separation process cannot be continuously operated. In this work, an amine-based solid adsorbent was applied during the preparation of the ZIF-8 membranes owing to the following reasons: (i) gas separation by the membrane can be operated continuously; (ii) the amino group provides a heterogeneous nucleation site for ZIF-8 to grow; and (iii) the reparation of surface defects on the macroporous substrate can be performed prior to the growth of the ZIF-8 membrane. Herein, the ZIF-8 membrane was successfully fabricated, and it possessed excellent CO2/CH4, CO2/N2, and H2/CH4 separation performances. The 0.6 μm ultrathin ZIF-8 membrane demonstrated a high CO2 permeance of 4.75 × 10−6 mol m−2 s−1 Pa−1 at 35 °C and 0.1 MPa, and ideal CO2/N2 and CO2/CH4 selectivities of 4.67 and 6.02, respectively. Furthermore, at 35 °C and 0.1 MPa, the ideal H2/CH4 selectivity of the ZIF-8 membrane reached 31.2, and a significantly high H2 permeance of 2.45 × 10−5 mol m−2 s−1 Pa−1.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Yongjiang Shan,Mingliang He,Fei Zhang,Yingdong Yang,Yifei Wang,Tian Gui,Yuqin Li,Zhipeng Wang,Xiangshu Chen
The deployment of green hydrogen energy plays a pivotal role in propelling sustainable development and achieving carbon neutrality. Separating H2 and CH4 is a crucial step in industrial hydrogen purification. Metal–organic framework (MOF) membranes offer vast prospects for applications in gas separation. Breaking the “trade-off” between permeance and selectivity has consistently remained a primary challenge in the realm of separation membranes. In this work, highly permeable H2 separation ZIF-8 membranes were fabricated on a vertical graphene (VG)-modified α-Al2O3 support (VG@α-Al2O3), and the VG layer can afford active sites for synthesizing ZIF-8 membranes and provide more gas transport path to reduce the mass transfer resistance. With the aid of O2 plasma in improving the hydrophilicity of the VG layer, nano-ZIF-8 crystals can be synthesized on the VG to act as seeds (ZIF-8@VG@α-Al2O3) for membrane synthesis, and green synthesis membranes were realized in aqueous solution. At 90 °C for 12 h, about 900 nm-thick membrane layers were synthesized, with a high H2 permeance of 1.8 × 10–6 mol·m–2·s–1·Pa–1 and H2/CH4 separation factor of 9.6. After the synthesis period was increased to 24 h, the denser ZIF-8 membrane resulted in a higher H2/CH4 selectivity (17.2). In contrast to the MOF membranes described in previous studies, satisfactory hydrogen permeance of ZIF-8 membranes can be achieved while maintaining high selectivity.
研究领域:
材料科学
·
膜分离技术
·
纳米材料
·
能源化学
·
环境科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
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
·
化学工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
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
·
化学工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Jiayi Liu,Yaohui Zhang,Yujie Ban,Weishen Yang
Emissions from the petrochemical industry often contain by-product hydrogen alongside various hydrocarbons, leading to both resource wastage and increased air pollution. The separation of H 2 from these hydrocarbons is thus of considerable economic and environmental importance. Conventional polymer membranes face inherent trade-offs between gas permeability and selectivity. To overcome this limitation, this study introduces a strategy to assemble metal–organic framework (MOF) nanoparticles into a sponge-like architecture on the surface of an ultrathin rubbery polysiloxane membrane, achieved by synergistically harnessing spin-coating-induced centrifugal forces and polymer–MOF chemical pinning forces. The resulting intricate sponge-like structure greatly promotes repeated adsorption–desorption cycles for the more condensable hydrocarbons, thereby markedly slowing their permeation through the membrane. The composite membrane achieves H 2 /CH 4 , H 2 /C 2 H 6 , and H 2 /C 3 H 8 separation factors of 136, 1370, and 1610, respectively, while maintaining H 2 permeances of 439 to 473 GPU. The membrane's effectiveness is further demonstrated for hydrogen separation from a simulated hydrocarbon-rich industrial tail gas: H 2 is enriched from 10% to 83% in the permeate. In doing so, the membrane not only efficiently recovers hydrogen but also reduce the combined emissions of six representative C 1 –C 4 hydrocarbons by 78%. This sponge-like MOF-polymer composite introduces a new paradigm for advanced H 2 /hydrocarbon separation membranes.
研究领域:
材料科学
·
膜技术
·
气体分离
·
石油化工工程
·
纳米材料
·
环境工程
✓ 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）