Water permeability in MXene membranes: Process matters |
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| Affiliation: | 1. Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy & Power Engineering, Dalian University of Technology, Dalian 116024, China;2. Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan 523808, China;1. School of Chemical Engineering, Shandong University of Technology, Zibo, 255049, PR China;2. School of Physics and State Key Laboratory of Crystal Materials, Shandong University, Jinan, Shandong 250100, PR China;3. Department of Chemical Engineering, Curtin University, Perth, WA 6845, Australia;1. School of Chemical Engineering, Shandong University of Technology, Zibo 255049, China;2. Department of Chemical Engineering, Tianjin Polytechnic University, Tianjin 300160, China;3. Department of Chemical Engineering, Curtin University, Perth, WA 6845, Australia;4. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;1. State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, College of Chemical Enginnering, Nanjing Tech University, 5 Xinmofan Road, Nanjing 210009, PR China;2. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, PR China |
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| Abstract: | Recent studies have shown impressive transport behaviors of water and ions within lamellar MXene membranes,which endows great promise in developing advanced separation application based high performance MXene membranes.However,most of the researches focused on modification of MXene nanoflakes and optimizing interlayer distance,leaving the impact of membrane fabrication process marginal.In this work,we studied the water flux of membranes made by vacuum filtration using delaminated MXene nanoflakes as the building-blocks.Our results show that the water permeability is extremely sensitive to the process,especially at the drying process,loading and deposit rate of nanoflakes(the feeding concentration).We find that the voids from less ordered stack rather than in-plane defects and interlayer galleries contribute to the large water permeability.The voids can be effectively avoided via deposition of MXene nanoflakes at a slow rate.Manipulating the stack of MXene nanoflakes during vacuum filtration and drying are critical for development of MXene membranes with desired performance for water permeation. |
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| Keywords: | Exfoliation MXene Two-dimensional materials Water permeability Water treatment |
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