2022 Fiscal Year Annual Research Report
Molecular Sieving Nanoarchitectures of Carbon Nanosheets Coordinated with Metal-Organic Clusters
| Project/Area Number |
22K04873
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| Research Institution | Kyoto University |
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Principal Investigator |
GHALEI BEHNAM 京都大学, 高等研究院, 特定准教授 (30725411)
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| Project Period (FY) |
2022-04-01 – 2023-03-31
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| Keywords | Membranes / Hydrogen / Gas separation / Nanolaminates |
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| Outline of Annual Research Achievements |
In the first year of the project, graphene oxide (GO) sheets with different sizes (1-5 microns) and oxidation states (40-50%) were synthesized by controlled oxidation of graphene and following the modified Hummer method. The GO laminate membranes were fabricated using a vacuum filtration technique. The concentration of GO solution was measured by UV spectroscopy and calibration curves was established to achieve GO laminate membranes of different thicknesses.The concentration of 0.01 mg/mL was selected as the optimum concentration which leads to defectfree nanolaminate membranes. Using 10-40 mL of the solution allowed to fabrication of membranes with thicknesses in the range of 50 nm to 200 nm. The membranes were tested and showed significant hydrogen gas permeance of 500-1200 GPU and H2/CO2 selectivity of 80-95. The permeance and selectivity of the membranes had trade-offs which means the membranes with the highest permeance showed the lowest selectivity. The membranes were also tested under humid gas feeds and the selectivity of the membranes dropped significantly under humid gas feeds. At 85% relative humidity, the membranes' H2/CO2 selectivity was reduced to less than 10. This further confirmed nanolaminate membrane instability under humid gas feed.By partial hydrolysis of (n-butylCp)2ZrCl2 in dimethylformamide (DMF) and coordination with a terephthalic acid linker at 70 °C, we synthesized tetrahedral Zr-MOP (Zr-MOP-1), as confirmed by XRD and 1HNMR. The initial results showed that Zr-MOP-1 can be mixed and form nanolaminates in combination with GO.
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