Incorporating ionic carbon dots in polyamide nanofiltration membranes for high perm-selectivity and antifouling performance
Recent advances in nanotechnology have brought great opportunities to the developing next-generation nanofiltration membranes for addressing the concern of global water scarcity and energy crisis. Carbon dots have been deemed as a promising nanomaterial for enhancing the nanofiltration performance o...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
2023
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| Online Access: | https://hdl.handle.net/10356/169053 |
| _version_ | 1811694916170940416 |
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| author | Zheng, Han Mou, Zihao Lim, Yu Jie Liu, Bo Wang, Rong Zhang, Wang Zhou, Kun |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Zheng, Han Mou, Zihao Lim, Yu Jie Liu, Bo Wang, Rong Zhang, Wang Zhou, Kun |
| author_sort | Zheng, Han |
| collection | NTU |
| description | Recent advances in nanotechnology have brought great opportunities to the developing next-generation nanofiltration membranes for addressing the concern of global water scarcity and energy crisis. Carbon dots have been deemed as a promising nanomaterial for enhancing the nanofiltration performance of polymeric membranes. Herein, carbon dots with cationic amine groups (PEI-CDs) and those with anionic sulfonate groups (PS-CDs) are incorporated into the polyamide selective layer of thin-film nanocomposite (TFN) membranes to create charged nanovoids (free volume) between the carbon dots and the surrounding polyamide network for high-efficiency nanofiltration. The positively charged amine group-based and negatively charged sulfonate group-based nanovoids in the resultant TFN-PEI-CDs and TFN-PS-CDs membranes, respectively, provide alternative pathways for efficient water permeation while effectively rejecting divalent ions via the Donnan and dielectric exclusion effects, thereby overcoming the recurring trade-off between permeability and selectivity encountered by dense polymeric membranes. In particular, the creation of negatively charged nanovoids enables the TFN-PS-CDs membrane to achieve one of the best performances among the recently reported nanofiltration membranes, by showing a nearly tripled pure water permeability of 30.9 L m−2 h−1 bar−1 as well as a higher Na2SO4 rejection rate of 99.4% than the membrane with a pristine polyamide selective layer. Moreover, the TFN membranes demonstrate greater resistance to foulants with charges of the same sign as the nanovoids. This work provides insights into the design of nanovoids with desired properties in other polymeric membranes for high-efficiency filtration processes. |
| first_indexed | 2024-10-01T07:15:10Z |
| format | Journal Article |
| id | ntu-10356/169053 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:15:10Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | ntu-10356/1690532023-06-27T08:10:55Z Incorporating ionic carbon dots in polyamide nanofiltration membranes for high perm-selectivity and antifouling performance Zheng, Han Mou, Zihao Lim, Yu Jie Liu, Bo Wang, Rong Zhang, Wang Zhou, Kun School of Mechanical and Aerospace Engineering Interdisciplinary Graduate School (IGS) Nanyang Environment and Water Research Institute Engineering::Environmental engineering::Water treatment Nanofiltration Thin-Film Nanocomposite Recent advances in nanotechnology have brought great opportunities to the developing next-generation nanofiltration membranes for addressing the concern of global water scarcity and energy crisis. Carbon dots have been deemed as a promising nanomaterial for enhancing the nanofiltration performance of polymeric membranes. Herein, carbon dots with cationic amine groups (PEI-CDs) and those with anionic sulfonate groups (PS-CDs) are incorporated into the polyamide selective layer of thin-film nanocomposite (TFN) membranes to create charged nanovoids (free volume) between the carbon dots and the surrounding polyamide network for high-efficiency nanofiltration. The positively charged amine group-based and negatively charged sulfonate group-based nanovoids in the resultant TFN-PEI-CDs and TFN-PS-CDs membranes, respectively, provide alternative pathways for efficient water permeation while effectively rejecting divalent ions via the Donnan and dielectric exclusion effects, thereby overcoming the recurring trade-off between permeability and selectivity encountered by dense polymeric membranes. In particular, the creation of negatively charged nanovoids enables the TFN-PS-CDs membrane to achieve one of the best performances among the recently reported nanofiltration membranes, by showing a nearly tripled pure water permeability of 30.9 L m−2 h−1 bar−1 as well as a higher Na2SO4 rejection rate of 99.4% than the membrane with a pristine polyamide selective layer. Moreover, the TFN membranes demonstrate greater resistance to foulants with charges of the same sign as the nanovoids. This work provides insights into the design of nanovoids with desired properties in other polymeric membranes for high-efficiency filtration processes. Nanyang Technological University The authors acknowledge the financial support from the Nanyang Environment and Water Research Institute (Core Funding), Nanyang Technological University, Singapore. 2023-06-27T08:10:55Z 2023-06-27T08:10:55Z 2023 Journal Article Zheng, H., Mou, Z., Lim, Y. J., Liu, B., Wang, R., Zhang, W. & Zhou, K. (2023). Incorporating ionic carbon dots in polyamide nanofiltration membranes for high perm-selectivity and antifouling performance. Journal of Membrane Science, 672, 121401-. https://dx.doi.org/10.1016/j.memsci.2023.121401 0376-7388 https://hdl.handle.net/10356/169053 10.1016/j.memsci.2023.121401 2-s2.0-85147415948 672 121401 en Journal of Membrane Science © 2023 Elsevier B.V. All rights reserved. |
| spellingShingle | Engineering::Environmental engineering::Water treatment Nanofiltration Thin-Film Nanocomposite Zheng, Han Mou, Zihao Lim, Yu Jie Liu, Bo Wang, Rong Zhang, Wang Zhou, Kun Incorporating ionic carbon dots in polyamide nanofiltration membranes for high perm-selectivity and antifouling performance |
| title | Incorporating ionic carbon dots in polyamide nanofiltration membranes for high perm-selectivity and antifouling performance |
| title_full | Incorporating ionic carbon dots in polyamide nanofiltration membranes for high perm-selectivity and antifouling performance |
| title_fullStr | Incorporating ionic carbon dots in polyamide nanofiltration membranes for high perm-selectivity and antifouling performance |
| title_full_unstemmed | Incorporating ionic carbon dots in polyamide nanofiltration membranes for high perm-selectivity and antifouling performance |
| title_short | Incorporating ionic carbon dots in polyamide nanofiltration membranes for high perm-selectivity and antifouling performance |
| title_sort | incorporating ionic carbon dots in polyamide nanofiltration membranes for high perm selectivity and antifouling performance |
| topic | Engineering::Environmental engineering::Water treatment Nanofiltration Thin-Film Nanocomposite |
| url | https://hdl.handle.net/10356/169053 |
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