Abstract:Metal−organic frameworks (MOFs) are promising candidates for the advanced membrane materials based on their diverse structures, modifiable pore environment, precise pore sizes, etc. Nevertheless, the use of supports and large amounts of solvents in traditional solvothermal synthesis of MOF membranes is considered inefficient, costly, and environmentally problematic, coupled with challenges in their scalable manufacturing. In this work, we report a solvent-free space-confined conversion (SFSC) approach for the … Show more
“…Comparison of H 2 /CH 4 separation performance for ZIF-8 membranes in this work and the other MOF membranes (HKUST-1, , KAUST-7, ZIF-22, ZIF-90, ZIF-9, ZIF-67, , ZIF-7-8, ZIF-7, , MIL-120, and ZIF-8 ,,,,,− ).…”
The deployment of green hydrogen energy plays a pivotal role in propelling sustainable development and achieving carbon neutrality. Separating H 2 and CH 4 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 H 2 separation ZIF-8 membranes were fabricated on a vertical graphene (VG)-modified α-Al 2 O 3 support (VG@α-Al 2 O 3 ), 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 O 2 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-Al 2 O 3 ) 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 H 2 permeance of 1.8 × 10 −6 mol• m −2 •s −1 •Pa −1 and H 2 /CH 4 separation factor of 9.6. After the synthesis period was increased to 24 h, the denser ZIF-8 membrane resulted in a higher H 2 /CH 4 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.
“…Comparison of H 2 /CH 4 separation performance for ZIF-8 membranes in this work and the other MOF membranes (HKUST-1, , KAUST-7, ZIF-22, ZIF-90, ZIF-9, ZIF-67, , ZIF-7-8, ZIF-7, , MIL-120, and ZIF-8 ,,,,,− ).…”
The deployment of green hydrogen energy plays a pivotal role in propelling sustainable development and achieving carbon neutrality. Separating H 2 and CH 4 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 H 2 separation ZIF-8 membranes were fabricated on a vertical graphene (VG)-modified α-Al 2 O 3 support (VG@α-Al 2 O 3 ), 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 O 2 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-Al 2 O 3 ) 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 H 2 permeance of 1.8 × 10 −6 mol• m −2 •s −1 •Pa −1 and H 2 /CH 4 separation factor of 9.6. After the synthesis period was increased to 24 h, the denser ZIF-8 membrane resulted in a higher H 2 /CH 4 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.
“…A diverse array of MOF/COF membranes, encompassing polycrystalline and MMMs, have exhibited compelling properties in gas separation. 127,128 Conversely, while HOF materials are more prevalent in gas adsorption separation, research on HOF-based gas separation membranes remains limited. Given the myriad advantages of HOFs, particularly their facile preparation and processing/regeneration, it is foreseeable that they are better suited for membrane manufacturing and practical utilization.…”
Section: Applications Of Hof-based Membranesmentioning
This review provides a comprehensive overview of the fabrication strategies and applications of hydrogen-bonded organic frameworks in membrane separation.
“…[68] Additionally, MOF synthesis can be intricate and costly, potentially limiting their widespread adoption in BTE in comparison to more readily available and cost-effective materials. [69] In contrast to traditional materials, MOF composites shine in terms of biocompatibility, tunable properties, and drug delivery capabilities. [70] Still, they may not possess the mechanical fortitude exhibited by metals and ceramics, which have a longer history of use in implant applications.…”
Section: Advantages and Disadvantages Of Mof Composites For Btementioning
Metal–organic frameworks (MOFs) exhibit exceptional characteristics, including high porosity and adjustable properties, rendering them highly suitable for biomedical applications. Recently, researchers have directed their attention toward the integration of MOFs into composites for bone tissue regeneration (BTE), presenting distinct advantages over conventional substitutes. In this comprehensive review, the authors delve into the latest advancements concerning MOF‐integrated composites for BTE. This exploration encompasses an examination of the properties of MOFs and the various synthesis techniques employed to fabricate these materials. Furthermore, the diverse applications of MOF‐integrated composites in BTE are investigated, encompassing areas such as antibacterial properties, osteogenic differentiation, angiogenesis, and immunomodulation. By providing a comprehensive overview of the ongoing research on MOF‐integrated composites for BTE, this study holds the promise of yielding innovative solutions within the realm of orthopedics.
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