A CO2-selective ZIF-type membrane was fabricated by growing a ZIF-8 layer on a graphene oxide nanoribbon (GONR)-coated polymeric substrate. Owing to the strong anchoring effect of GONRs to the ZIF-8 crystal, the pore window of the ZIF-8 layer can be tuned with a molecular cut-off range of 3.4-3.6 Å. The prepared membrane showed a CO2 permeance of 7.8 × 10-9 mol m-2 Pa-1 s-1 with a CO2/CH4 selectivity of 27, which surpassed the CO2/hydrocarbon separation performance of most reported ZIF-type membranes and were comparable to those of ZIF-94 type membranes known to be effective for CO2 extraction. Multiscale computational simulation demonstrated that the CO2 selective permeation of the ZIF-8/GONR membrane was attributed to the low diffusivity of CH4 in the rigid ZIF-8 framework. The obtained experimental and computational results illustrate that the pore-tuned ZIF-8 framework can be effectively used for CO2 separation by adjusting the aperture size.
Bibliographical noteFunding Information:
This study was supported by the Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF2017M3D1A1039287). This study was also supported by the Global Frontier Program through the Global Frontier Hybrid Interface Materials (GFHIM) of the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (Project No. 2013M3A6B1078882). This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (NRF-2020R1C1C1003289). This research was supported by the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education (NRF-2019R1A6A1A11055660).
© The Royal Society of Chemistry.
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)