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Title: Incorporating ionic carbon dots in polyamide nanofiltration membranes for high perm-selectivity and antifouling performance
Authors: Zheng, Han
Mou, Zihao
Lim, Yu Jie
Liu, Bo
Wang, Rong
Zhang, Wang
Zhou, Kun
Keywords: Engineering::Environmental engineering::Water treatment
Issue Date: 2023
Source: 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-.
Journal: Journal of Membrane Science
Abstract: 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.
ISSN: 0376-7388
DOI: 10.1016/j.memsci.2023.121401
Schools: School of Mechanical and Aerospace Engineering 
Interdisciplinary Graduate School (IGS) 
Research Centres: Nanyang Environment and Water Research Institute 
Rights: © 2023 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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