Abstract
Current surface-controlled biofouling-based membrane technologies are retarded by short-run anti-biofouling performances. Dynamic fibre membrane, enriching the space and time of anti-biofouling agents acting on membrane, offers the potential to control biofouling in a continuous manner. We report the rational design and construction of a highly sustainable anti-biofouling dynamic fibre membrane, based on three interlocked criteria: (1) a three-dimensional space in the inner layer of fibre, halloysite nanotube (HNT), as ample active sites that load and release the biofilm inhibitor D-tyrosine; (2) a smart dynamic openness in the outer layer of fibre, polyvinylidene fluoride/polyacrylic acid semi-interpenetrating network polymer, as a continuous regulator that reloads D-tyrosine into HNT and re-releases it out of fibre; (3) electrospinning into dynamic fibre membrane. The dynamic fibre membrane-based ultrafiltration membrane exhibits exceedingly stable and sustainable anti-biofouling performance up to 185 days with only a 9.1% drop in reversible fouling recovery rate in a practical membrane bioreactor, far superior to the more than 40.4% decline of reversible fouling recovery rate within 75 days for the state-of-the-art anti-biofouling membranes. This systematic space–time-involved multidimensional membrane-construction concept opens a path of long-term sustainable running for membrane-based water treatment techniques.
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Data availability
Data supporting the findings of this study are available within this article and its Supplementary Information. The raw data for the figures have been uploaded to Figshare (https://doi.org/10.6084/m9.figshare.24944706).
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Acknowledgements
We gratefully acknowledge financial supports from the Key Program of Natural Science Foundation of Tianjin City (18JCZDJC39700 (X.G.)), the Science and Technology Project of Binhai in Tianjin (BHXQKJXM-PT-ZJSHJ2017004 (X.G.)), the National Key Research and Development Program (2019YFC1804105 (X.G.)), the National Natural Science Foundation of China (22376108 (X.G.)) and 111 Program, Ministry of Education of China (T2017002 (X.G.)). We thank Y.C. at Nankai University for her great help in CLSM characterization.
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X.G. designed and led the project and improved the manuscript. S.F. prepared the dynamic fibre membrane, did the characterization, analysed the data and wrote the manuscript draft under guidance of X.G. Q. Zhou provided the experimental site for evaluating the practical anti-biofouling efficacy of the dynamic UF membrane. C. Liu helped to complete the data collection and figures preparation. C. Li, P.Y. and Y.T. jointly completed the evaluation of practical anti-biofouling efficacy of the dynamic fibre membrane. H.S., M.L., Q. Zhou, Q. Zhang. and Q.L. provided theoretical support. All authors contributed to the improvement of the manuscript.
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Nature Water thanks Alicia Kyoungjin An, Jung-Hyun Lee, and the other, anonymous, reviewer for their contribution to the peer review of this work.
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Supplementary Methods, Figs. 1–14, Discussion and Tables 1–14.
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Fan, S., Zhou, Q., Liu, C. et al. Rational design of dynamic fibre membrane for sustainable biofouling control. Nat Water 2, 161–171 (2024). https://doi.org/10.1038/s44221-024-00196-8
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DOI: https://doi.org/10.1038/s44221-024-00196-8