期刊
ACS APPLIED NANO MATERIALS
卷 5, 期 5, 页码 7029-7035出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.2c00974
关键词
graphene oxide membrane; noninterlocked structure; CO2 adsorption; pore-blocking effect; H-2/CO2 separation
资金
- National Research Foundation of Korea (NRF) - Ministry of Education [2020R1I1A2073243]
- National Research Foundation of Korea (NRF) - Korean government (Ministry of Science and ICT (MSIT)) [2021M3I3A1084906]
- Kangwon National University
- National Research Foundation of Korea(NRF) - Korea government(MSIT) [NRF2021R1A5A1084921]
- National Research Foundation of Korea [2021M3I3A1084906, 2020R1I1A2073243] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study investigates the gas transport behavior of graphene oxide (GO) and reduced GO (rGO) membranes and discovers their unique gas separation performance. The membranes exhibit high separation factors, particularly in H-2/CO2 separation, due to their nanoporous gas diffusion channels. The results suggest that further modification of GO membranes could enhance their performance in specific separation processes.
Recently, graphene oxide (GO) has been investigated as a class of molecular filters for selective gas and ion transport. However, detailed transport mechanisms have been poorly understood thus far. Here, we report the gas transport behavior of noninterlocked GO and reduced GO (rGO) membranes, which contain nanoporous gas diffusion channels generated by the adjacent edges of GO and rGO sheets. Both membranes exhibited Knudsen gas diffusion behavior; however, the separation factors of these membranes exceeded the theoretical Knudsen separation factors for gas/CO2 selectivities of various gas mixtures owing to extremely low CO2 permeance. The unique transport features of the low CO2 permeance were explained by the blocking effect of CO2 adsorbed in the nanoporous diffusion channels because of the high CO2 affinity of the edges of GO and rGO sheets. Furthermore, the rGO lamellar structure generally shows impermeable interlayer spacing, indicating that the only gas diffusion channel is the nanopores created by neighboring the edges of the rGO sheets. Notably, both membranes maintained a higher H-2/CO2 separation factor than the theoretical Knudsen selectivity, including the measurements of mixed-gas permeation experiments. This study provides insight that further GO modification may improve the gas separation performance suitable for specific separation processes.
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