Enhanced CO2-selective behavior of Pebax-1657: A comparative study between the influence of graphene-based fillers |
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| Affiliation: | 1. Gas Engineering Department, Ahvaz Faculty of Petroleum Engineering, Petroleum University of Technology (PUT), Post Office Box 63431, Ahvaz, Iran;2. Faculty of Chemical Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, Iran;3. Department of Petrochemical Engineering, Amirkabir University of Technology (AUT), Mahshahr, Iran;1. UNESCO Centre for Membrane Science and Technology, School of Chemical Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia;2. Cooperative Research Centre for Polymers, Notting Hill, Victoria 3168, Australia;1. State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, PR China;2. School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, PR China;3. Biological and Environmental Science and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia;1. School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, China;2. UNESCO Centre for Membrane Science and Technology, School of Chemical Engineering, University of New South Wales, Sydney, Australia;3. Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium;1. Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, 606-8501 Kyoto, Japan;2. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan |
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| Abstract: | Mixed matrix membranes (MMMs) containing graphene-based fillers have attracted considerable attention in the field of gas separation. In this study, two types of graphene derivatives (Graphene (G) and Graphene Oxide (GO)) were embedded into the poly-ether-block-amide (Pebax) based MMM to investigate and compare CO2/N2 separation at various filler loadings (0.3–1 wt%). The morphologies of the prepared neat Pebax and MMMs were characterized by SEM, XRD, FTIR and DSC. Compared with the neat Pebax, the permeability of all gases was increased by adding filler content in the MMMs due to the crystallinity decrement of the polyamide (PA) segment. The best separation performance of the Pebax/G MMMs occurred at 0.7 wt%, where the CO2 permeability increased from 26.51 to 44.78 Barrer (~1.7 times). Also, for the Pebax/GO MMMs, the CO2 permeability was increased up to 58.96 Barrer (~2.2 times) by adding 0.5 wt% filler. This further gas permeation increment for the Pebax/GO sample was attributed to the higher affinity of GO nanosheets to CO2 sorption, which can facilitate CO2 gas transition through the membrane matrix. Moreover, the CO2/N2 ideal selectivity increased from 74.26 for the neat Pebax to 111.95 (~1.5 times) and 120.72 (~1.62 times) by adding 0.7 wt% G (Pebax/G-0.7) and 1 wt% GO (Pebax/GO-1) into Pebax, respectively. As a consequence, graphene derivatives can be recognized as a promising developer of permselectivity (permeability and selectivity) of the MMMs. |
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| Keywords: | Gas separation Mixed matrix membrane Pebax 1657 Graphene Graphene oxide |
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