Permselective H2/CO2 Separation and Desalination of Hybrid GO/rGO Membranes with Controlled Pre-cross-linking
Covalent bonding is widely adopted in graphene oxide (GO) membrane to improve structural integrity and restrict swelling, while it comes with a price of enlarged d-spacing and sacrifices membrane selectivity. This work offers a facile strategy to break the trade-off between membrane stability and se...
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Published in | ACS applied materials & interfaces Vol. 10; no. 33; pp. 28166 - 28175 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
American Chemical Society
22.08.2018
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Abstract | Covalent bonding is widely adopted in graphene oxide (GO) membrane to improve structural integrity and restrict swelling, while it comes with a price of enlarged d-spacing and sacrifices membrane selectivity. This work offers a facile strategy to break the trade-off between membrane stability and selectivity. Specifically, graphene oxide (GO)/reduced graphene oxide (rGO) hybrid membranes were fabricated by a controlled pre-cross-linking method. With this method, restricted swelling by cross-linking and reduced d-spacing by GO reduction can be achieved simultaneously by controlling reaction time. Membranes were prepared on porous alumina support by vacuum filtration method. Two different d-spacing values (∼12.0 and ∼7.5 Å) were found in the hybrid membrane, representing the layer structures of expanded GO interspacing with inserted cross-linker and reduced layer spacing after GO reduction. The presence of such mixed layer structures enables restricted swelling, excellent mechanical strength, and unique separation property. The hybrid membrane shows excellent permselective H2/CO2 separation with a separation factor of 22.93 ± 1.57 and H2 permeance of 2.46 ± 0.01× 10–8 mol m–2 s–1 Pa–1. In desalination test with 3.5 wt % sea salt solution, the hybrid membrane shows high ion (Na+, K+, Mg2+, Cl–, and SO4 2–) rejection rate of above 99%, as well as excellent durability. |
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AbstractList | Covalent bonding is widely adopted in graphene oxide (GO) membrane to improve structural integrity and restrict swelling, while it comes with a price of enlarged d-spacing and sacrifices membrane selectivity. This work offers a facile strategy to break the trade-off between membrane stability and selectivity. Specifically, graphene oxide (GO)/reduced graphene oxide (rGO) hybrid membranes were fabricated by a controlled pre-cross-linking method. With this method, restricted swelling by cross-linking and reduced d-spacing by GO reduction can be achieved simultaneously by controlling reaction time. Membranes were prepared on porous alumina support by vacuum filtration method. Two different d-spacing values (∼12.0 and ∼7.5 Å) were found in the hybrid membrane, representing the layer structures of expanded GO interspacing with inserted cross-linker and reduced layer spacing after GO reduction. The presence of such mixed layer structures enables restricted swelling, excellent mechanical strength, and unique separation property. The hybrid membrane shows excellent permselective H2/CO2 separation with a separation factor of 22.93 ± 1.57 and H2 permeance of 2.46 ± 0.01× 10-8 mol m-2 s-1 Pa-1. In desalination test with 3.5 wt % sea salt solution, the hybrid membrane shows high ion (Na+, K+, Mg2+, Cl-, and SO42-) rejection rate of above 99%, as well as excellent durability. Covalent bonding is widely adopted in graphene oxide (GO) membrane to improve structural integrity and restrict swelling, while it comes with a price of enlarged d-spacing and sacrifices membrane selectivity. This work offers a facile strategy to break the trade-off between membrane stability and selectivity. Specifically, graphene oxide (GO)/reduced graphene oxide (rGO) hybrid membranes were fabricated by a controlled pre-cross-linking method. With this method, restricted swelling by cross-linking and reduced d-spacing by GO reduction can be achieved simultaneously by controlling reaction time. Membranes were prepared on porous alumina support by vacuum filtration method. Two different d-spacing values (∼12.0 and ∼7.5 Å) were found in the hybrid membrane, representing the layer structures of expanded GO interspacing with inserted cross-linker and reduced layer spacing after GO reduction. The presence of such mixed layer structures enables restricted swelling, excellent mechanical strength, and unique separation property. The hybrid membrane shows excellent permselective H2/CO2 separation with a separation factor of 22.93 ± 1.57 and H2 permeance of 2.46 ± 0.01× 10–8 mol m–2 s–1 Pa–1. In desalination test with 3.5 wt % sea salt solution, the hybrid membrane shows high ion (Na+, K+, Mg2+, Cl–, and SO4 2–) rejection rate of above 99%, as well as excellent durability. |
Author | Li, Yifan Zhu, Jiahua Lin, Han Dangwal, Shailesh Kim, Seok-Jhin Liu, Ruochen Mehra, Nitin |
AuthorAffiliation | School of Chemical Engineering Intelligent Composites Laboratory, Department of Chemical and Biomolecular Engineering Oklahoma State University |
AuthorAffiliation_xml | – name: Intelligent Composites Laboratory, Department of Chemical and Biomolecular Engineering – name: Oklahoma State University – name: School of Chemical Engineering |
Author_xml | – sequence: 1 givenname: Han surname: Lin fullname: Lin, Han organization: Intelligent Composites Laboratory, Department of Chemical and Biomolecular Engineering – sequence: 2 givenname: Ruochen surname: Liu fullname: Liu, Ruochen organization: Oklahoma State University – sequence: 3 givenname: Shailesh surname: Dangwal fullname: Dangwal, Shailesh organization: Oklahoma State University – sequence: 4 givenname: Seok-Jhin orcidid: 0000-0002-7119-3431 surname: Kim fullname: Kim, Seok-Jhin email: seokjhin.kim@okstate.edu organization: Oklahoma State University – sequence: 5 givenname: Nitin surname: Mehra fullname: Mehra, Nitin organization: Intelligent Composites Laboratory, Department of Chemical and Biomolecular Engineering – sequence: 6 givenname: Yifan surname: Li fullname: Li, Yifan organization: Intelligent Composites Laboratory, Department of Chemical and Biomolecular Engineering – sequence: 7 givenname: Jiahua orcidid: 0000-0002-2238-9147 surname: Zhu fullname: Zhu, Jiahua email: jzhu1@uakron.edu organization: Intelligent Composites Laboratory, Department of Chemical and Biomolecular Engineering |
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Title | Permselective H2/CO2 Separation and Desalination of Hybrid GO/rGO Membranes with Controlled Pre-cross-linking |
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