Tunable molecular transport and sieving enabled by covalent organic framework with programmable surface charge |
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| Affiliation: | 1. Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China;2. School of Future Technology, University of Chinese Academy of Sciences, Beijing 100049, PR China;3. Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, PR China;1. CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;2. School of Future Technology, University of Chinese Academy of Sciences, Beijing 100049, China;1. CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China;2. Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education, College of Chemistry and Materials Science, Huaibei Normal University, Huaibei, Anhui 235000, PR China;3. Applied Mechanics Laboratory, Department of Engineering Mechanics, and Center for Nano and Micro Mechanics. Tsinghua University, Beijing 100084, PR China;4. School of Future Technology, University of Chinese Academy of Sciences, Beijing 100049, PR China;1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China;2. Tianjin Key Laboratory of Membrane Science and Desalination Technology, State Key Laboratory of Chemical Engineering (Tianjin University), Tianjin 300072, PR China;1. Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China;2. Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China;3. Department of Electrical and Computer Engineering, University of Houston, Houston, TX 77204, USA;4. Department of Physics, University of Arizona, Tucson, AZ 85721, USA;5. James C. Wyant College of Optical Sciences, University of Arizona, Tucson, AZ 85721, USA;6. Department of Mechanical Engineering, University of Houston, Houston, TX 77204, USA;7. Materials Science and Engineering, University of Houston, Houston, TX 77204, USA;8. School of Science, Southwest Petroleum University, Chengdu, Sichuan 610500, China;9. Department of Electrical and Systems Engineering, Washington University in St. Louis, St. Louis, MI 63130, USA;10. Department of Electrical and Computer Engineering, Baylor University, Waco, TX 76798, USA;11. Department of Mathematics, Purdue University, West Lafayette, IN 47907, USA;12. Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX 77204, USA;1. School of Environmental Science and Engineering, Tianjin University, Tianjin, 300350, China;2. College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China;3. High-Tech Institute of Beijing, Beijing, 710025, China |
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| Abstract: | Molecular separation is critical to mitigating the issues of water contamination and shortage and currently focuses on the use of framework materials fabricated by special building blocks. However, developing a simple and tunable synthesis methodology for materials with alternative permeation and selectivity remains challenging. Here, we fabricate a series of nanochannel membranes composed of uniform spherical covalent organic frameworks (COFs). Diversified spherical COFs have diameters ranging from ～150 to ～800 nm, therefore demonstrating a programmable surface charge distribution from ?24 to ?63 mV. COF membranes with tailor-made surface charge enable different surface energy levels and allow increasing water permeation of 15.5 to 34.5 L m?2 h?1 bar?1. Furthermore, COFs can also act as filters, achieving up to 99.7% rejection and separation of the opposite charged dyes. We expect these COFs with tunable surface charge to be applicable to variety of fields, including sieving, batteries, and water treatments. |
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| Keywords: | Molecular sieving Covalent organic framework membrane Surface charge regulation Size control Water transport |
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