2019 Fiscal Year Annual Research Report
Microporous CO2 Capture Membranes Promoted by Carbonic Anhydrase-Mimetic Catalyst
| Project/Area Number |
18K14042
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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) |
2018-04-01 – 2020-03-31
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| Keywords | CO2 Capture / Gas Separation / Membranes / Mimic Enzyme |
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| Outline of Annual Research Achievements |
1. Two types of hystidyl bolaamphiphile structures with two amino acid heads and alkyl chain bodyoes with seven and twenty carbons were synthesized.
2. The synthesized bolaamphiphiles were dissolved in pH-controlled water to produce the self-assembly (5 mM) and then ZnCl2 salt were added (1 mM) to construct complexes with histidine imidazole moieties on the self-assembled surface. 2. Through the optimization of the self-assembly of bolaamphiphiles, by adjusting the micellization process and particle formation, the high catalytic efficiency of 1.5 M-1s-1 for hydration of CO2 molecules was obtained. 3. Water soluble PEG based polyurethane polymer was synthesized. 4. The self-assembled particles were used as a filler to enhance the CO2 separation performance of water-soluble PEG-based polyurethane. 1,2, 5 and 10 wt.% of the fillers were added into the polymer matrix to form mixed matrix membranes. 70-micron thick membranes were formed through a casting and evaporation technique. The gas separation results showed significant enhancement in both CO2 permeability (up to 200%), and CO2/N2 selectivity (up to 50%) compare with the neat polymer. The high CO2/N2 selectivity as 100 and CO2 permeability of 200 barrer is achieved. 5. Mixed gas separation performance and measurement of membranes stability in real gas separation condition showed no significant change of the membrane properties for more than 100 h continuous operation.
6. Thin film membranes with 1100 GPU and CO2/N2 selectivity of 45 were prepared in the presence of mimetic enzymes.
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