High‐Precision and High‐Flux Separation by Rationally Designing the Nanochannels and Surface Nanostructure of Polyamide Nanofiltration Membranes
High‐precision separation with increased water permeability is critical for efficient membrane‐based water treatment processes. To achieve high selectivity toward different targeted species while allowing rapid water transportation, the structure of the membrane polyamide selective layer requires de...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley-VCH
2022-07-01
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| Series: | Small Science |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/smsc.202200026 |
| _version_ | 1828426191707570176 |
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| author | Han Zheng Zihao Mou Yu Jie Lim Narasimalu Srikanth Wang Zhang Sheng Guo Rong Wang Kun Zhou |
| author_facet | Han Zheng Zihao Mou Yu Jie Lim Narasimalu Srikanth Wang Zhang Sheng Guo Rong Wang Kun Zhou |
| author_sort | Han Zheng |
| collection | DOAJ |
| description | High‐precision separation with increased water permeability is critical for efficient membrane‐based water treatment processes. To achieve high selectivity toward different targeted species while allowing rapid water transportation, the structure of the membrane polyamide selective layer requires delicate regulation. Herein, an effective approach to systematically expand the pore size of polyamide layers by incorporating ammonium ion‐modified carbon dots (CDs) into the polyamide network is developed. The ammonium ions with different alkyl chain lengths attached to the CDs create nanochannels of different sizes in the network to lower the energy barrier for water transportation while maintaining high selectivity to targeted species. When the alkyl chain length of the ammonium ions reaches eight carbon atoms (i.e., C8 ions), the amphiphilic C8‐CDs induce the formation of the ridged nanostructure on the membrane surface and hence the increased membrane filtration area. The resultant thin‐film nanocomposite (TFN) membrane, denoted as the TFN‐C8‐CDs membrane, demonstrates a higher Na2SO4 rejection of 98.9% and NaCl/Na2SO4 selectivity of 83.1 than the pristine polyamide membrane, together with a tripled pure water permeability of 29.0 L m−2 h−1 bar−1. Herein, a viable approach for ingeniously designing the nanochannels and surface nanostructure of polyamide membranes for more efficient filtration processes is provided. |
| first_indexed | 2024-12-10T16:42:04Z |
| format | Article |
| id | doaj.art-7beeb9b4c351434b9eec2c05665da9bc |
| institution | Directory Open Access Journal |
| issn | 2688-4046 |
| language | English |
| last_indexed | 2024-12-10T16:42:04Z |
| publishDate | 2022-07-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | Small Science |
| spelling | doaj.art-7beeb9b4c351434b9eec2c05665da9bc2022-12-22T01:41:11ZengWiley-VCHSmall Science2688-40462022-07-0127n/an/a10.1002/smsc.202200026High‐Precision and High‐Flux Separation by Rationally Designing the Nanochannels and Surface Nanostructure of Polyamide Nanofiltration MembranesHan Zheng0Zihao Mou1Yu Jie Lim2Narasimalu Srikanth3Wang Zhang4Sheng Guo5Rong Wang6Kun Zhou7Environmental Process Modelling Centre Nanyang Environment and Water Research Institute Nanyang Technological University 1 Cleantech Loop Singapore 637141 SingaporeInstitute for Advanced Study Chengdu University 2025 Chengluo Avenue Chengdu 610106 P. R. ChinaInterdisciplinary Graduate Programme Graduate College Nanyang Technological University 61 Nanyang Drive Singapore 637553 SingaporeEnergy Research Institute @ NTU Nanyang Technological University 1 Cleantech Loop Singapore 637141 SingaporeSchool of Mechanical and Aerospace Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 SingaporeEnvironmental Process Modelling Centre Nanyang Environment and Water Research Institute Nanyang Technological University 1 Cleantech Loop Singapore 637141 SingaporeSingapore Membrane Technology Centre Nanyang Environment and Water Research Institute Nanyang Technological University 1 Cleantech Loop Singapore 637141 SingaporeEnvironmental Process Modelling Centre Nanyang Environment and Water Research Institute Nanyang Technological University 1 Cleantech Loop Singapore 637141 SingaporeHigh‐precision separation with increased water permeability is critical for efficient membrane‐based water treatment processes. To achieve high selectivity toward different targeted species while allowing rapid water transportation, the structure of the membrane polyamide selective layer requires delicate regulation. Herein, an effective approach to systematically expand the pore size of polyamide layers by incorporating ammonium ion‐modified carbon dots (CDs) into the polyamide network is developed. The ammonium ions with different alkyl chain lengths attached to the CDs create nanochannels of different sizes in the network to lower the energy barrier for water transportation while maintaining high selectivity to targeted species. When the alkyl chain length of the ammonium ions reaches eight carbon atoms (i.e., C8 ions), the amphiphilic C8‐CDs induce the formation of the ridged nanostructure on the membrane surface and hence the increased membrane filtration area. The resultant thin‐film nanocomposite (TFN) membrane, denoted as the TFN‐C8‐CDs membrane, demonstrates a higher Na2SO4 rejection of 98.9% and NaCl/Na2SO4 selectivity of 83.1 than the pristine polyamide membrane, together with a tripled pure water permeability of 29.0 L m−2 h−1 bar−1. Herein, a viable approach for ingeniously designing the nanochannels and surface nanostructure of polyamide membranes for more efficient filtration processes is provided.https://doi.org/10.1002/smsc.202200026carbon dotsnanofiltrationmembrane selectivitysurface nanostructuresthin-film nanocomposites |
| spellingShingle | Han Zheng Zihao Mou Yu Jie Lim Narasimalu Srikanth Wang Zhang Sheng Guo Rong Wang Kun Zhou High‐Precision and High‐Flux Separation by Rationally Designing the Nanochannels and Surface Nanostructure of Polyamide Nanofiltration Membranes Small Science carbon dots nanofiltration membrane selectivity surface nanostructures thin-film nanocomposites |
| title | High‐Precision and High‐Flux Separation by Rationally Designing the Nanochannels and Surface Nanostructure of Polyamide Nanofiltration Membranes |
| title_full | High‐Precision and High‐Flux Separation by Rationally Designing the Nanochannels and Surface Nanostructure of Polyamide Nanofiltration Membranes |
| title_fullStr | High‐Precision and High‐Flux Separation by Rationally Designing the Nanochannels and Surface Nanostructure of Polyamide Nanofiltration Membranes |
| title_full_unstemmed | High‐Precision and High‐Flux Separation by Rationally Designing the Nanochannels and Surface Nanostructure of Polyamide Nanofiltration Membranes |
| title_short | High‐Precision and High‐Flux Separation by Rationally Designing the Nanochannels and Surface Nanostructure of Polyamide Nanofiltration Membranes |
| title_sort | high precision and high flux separation by rationally designing the nanochannels and surface nanostructure of polyamide nanofiltration membranes |
| topic | carbon dots nanofiltration membrane selectivity surface nanostructures thin-film nanocomposites |
| url | https://doi.org/10.1002/smsc.202200026 |
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