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Li N, Xue W, Han Y, Zhu B, Wu J, Xu Z. Defect Engineering in GO Membranes - Tailoring Size and Oxidation Degree of Nanosheet for Enhanced Pore Channels. Chem Asian J 2024:e202301065. [PMID: 38329385 DOI: 10.1002/asia.202301065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 01/23/2024] [Accepted: 02/06/2024] [Indexed: 02/09/2024]
Abstract
Graphene Oxide (GO) membrane has been extensively applied in the field of water purification and membrane separation processes. While the solute molecule transport in GO membranes encompasses interlayer channels, edge defects, and in-plane crack-like holes, the significance of edge defects or crack-like pores in ultrathin membranes is often overlooked. In our study, we focused on the construction of short-range channel GO membranes with varied defect structures by modulating the transverse size of the porous nanosheets. GO nanosheets with different sizes were procured through high-energy γ-irradiation combined with centrifugation. Notably, the large-sized porous GO nanosheets (L-pGO) exhibit a consistent structure, and numerous in-plane defects. In contrast, the smaller counterparts (S-pGO) present a fewer in-plane defects. The performance metrics revealed that L-pGO exhibited a water flux of 849.25 L m-2 h-1 bar-1 , while S-pGO demonstrated nearly 100 % dye rejection capacity. These findings underscore the potential of defect engineering as a powerful strategy to enhance the efficiency of two-dimensional membranes.
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Affiliation(s)
- Nan Li
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Chemistry, Tiangong University, Binshuixi Road, Tianjin, 300387, P. R. China
| | - Weihao Xue
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textiles Science and Engineering, Tiangong University, Binshuixi Road, Tianjin, 300387, P. R. China
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Chemistry, Tiangong University, Binshuixi Road, Tianjin, 300387, P. R. China
| | - Yu Han
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textiles Science and Engineering, Tiangong University, Binshuixi Road, Tianjin, 300387, P. R. China
| | - Bo Zhu
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textiles Science and Engineering, Tiangong University, Binshuixi Road, Tianjin, 300387, P. R. China
| | - Jinman Wu
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textiles Science and Engineering, Tiangong University, Binshuixi Road, Tianjin, 300387, P. R. China
| | - Zhiwei Xu
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textiles Science and Engineering, Tiangong University, Binshuixi Road, Tianjin, 300387, P. R. China
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Song H, Peng Y, Wang C, Shu L, Zhu C, Wang Y, He H, Yang W. Structure Regulation of MOF Nanosheet Membrane for Accurate H 2 /CO 2 Separation. Angew Chem Int Ed Engl 2023; 62:e202218472. [PMID: 36854948 DOI: 10.1002/anie.202218472] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 02/27/2023] [Accepted: 02/28/2023] [Indexed: 03/02/2023]
Abstract
High-purity H2 production accompanied with a precise decarbonization opens an avenue to approach a carbon-neutral society. Metal-organic framework nanosheet membranes provide great opportunities for an accurate and fast H2 /CO2 separation, CO2 leakage through the membrane interlayer galleries decided the ultimate separation accuracy. Here we introduce low dose amino side groups into the Zn2 (benzimidazolate)4 conformation. Physisorbed CO2 served as interlayer linkers, gently regulated and stabilized the interlayer spacing. These evoked a synergistic effect of CO2 adsorption-assisted molecular sieving and steric hinderance, whilst exquisitely preserving apertures for high-speed H2 transport. The optimized amino membranes set a new record for ultrathin nanosheet membranes in H2 /CO2 separation (mixture separation factor: 1158, H2 permeance: 1417 gas permeation unit). This strategy provides an effective way to customize ultrathin nanosheet membranes with desirable molecular sieving ability.
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Affiliation(s)
- Hongling Song
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, China
- University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing, 100049, China
| | - Yuan Peng
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, China
- University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing, 100049, China
| | - Chenlu Wang
- University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing, 100049, China
- Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China
| | - Lun Shu
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, China
| | - Chenyu Zhu
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, China
- University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing, 100049, China
| | - Yanlei Wang
- University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing, 100049, China
- Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China
| | - Hongyan He
- University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing, 100049, China
- Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China
| | - Weishen Yang
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, China
- University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing, 100049, China
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Mrazík L, Kříž P. Porous Medium Equation in Graphene Oxide Membrane: Nonlinear Dependence of Permeability on Pressure Gradient Explained. MEMBRANES 2021; 11:membranes11090665. [PMID: 34564482 PMCID: PMC8469019 DOI: 10.3390/membranes11090665] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 08/25/2021] [Accepted: 08/27/2021] [Indexed: 12/02/2022]
Abstract
Membrane performance in gas separation is quantified by its selectivity, determined as a ratio of measured gas permeabilities of given gases at fixed pressure difference. In this manuscript a nonlinear dependence of gas permeability on pressure difference observed in the measurements of gas permeability of graphene oxide membrane on a manometric integral permeameter is reported. We show that after reasoned assumptions and simplifications in the mathematical description of the experiment, only static properties of any proposed governing equation can be studied, in order to analyze the permeation rate for different pressure differences. Porous Medium Equation is proposed as a suitable governing equation for the gas permeation, as it manages to predict a nonlinear behavior which is consistent with the measured data. A coefficient responsible for the nonlinearity, the polytropic exponent, is determined to be gas-specific—implications on selectivity are discussed, alongside possible hints to a deeper physical interpretation of its actual value.
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Affiliation(s)
- Lukáš Mrazík
- Department of Computing and Control Engineering, University of Chemistry and Technology Prague, 166 28 Prague, Czech Republic
- Correspondence:
| | - Pavel Kříž
- Department of Mathematics, University of Chemistry and Technology Prague, 166 28 Prague, Czech Republic;
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