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In Situ Reduction of Silver by Polydopamine: A Novel Antimicrobial Modification of a Thin-Film Composite Polyamide Membrane
Abstract
We report a facile method for the antimicrobial modification of a thin-film composite polyamide reverse osmosis (RO) membrane. The membrane surface was first coated with polydopamine (PDA), whose reducing catechol groups subsequently immobilized silver ions in situ to form uniformly dispersed silver nanoparticles (AgNPs) inside the coating layer. Agglomeration of AgNPs was not observed despite a high silver loading of 13.3 ± 0.3 μg/cm(2) (corresponding to a surface coverage of 18.5% by the nanoparticles). Both diffusion inhibition zone tests and colony formation unit tests showed clear antimicrobial effects of the silver loaded membranes on model bacteria Bacillus subtilis and Escherichia coli. Furthermore, the silver immobilized membrane had significantly enhanced salt rejection compared to the control PDA coated membrane, which is attributed to the preferential formation of AgNPs at defect sides within the PDA layer. This self-healing mechanism can be used to prepare antimicrobial RO membranes with improved salt rejection without scarifying the membrane permeability, which provides a new dimension for membrane surface modification.
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Cited by
The upper bound of thin-film composite (TFC) polyamide membranes for desalination
Yang, Z., Guo, H., & Tang, C. Y. (2019) · Journal of Membrane Science · doi:10.1016/j.memsci.2019.117297 · Cited by 592
Self-citationYang, Z., Zhou, Z.-W., Guo, H., Yao, Z., Ma, X.-H., Song, X., Feng, S.-P., & Tang, C. Y. (2018) · Environmental Science & Technology · doi:10.1021/acs.est.8b02425 · Cited by 437
Self-citationChoudhury, R. R., Gohil, J. M., Mohanty, S., & Nayak, S. K. (2018) · Journal of Materials Chemistry A · doi:10.1039/c7ta08627j · Cited by 420
Engineering antifouling reverse osmosis membranes: A review
Zhao, S., Liao, Z., Fane, A., Li, J., Tang, C., Zheng, C., Lin, J., & Kong, L. (2021) · Desalination · doi:10.1016/j.desal.2020.114857 · Cited by 363
Self-citationShao, S., Zeng, F., Long, L., Zhu, X., Peng, L. E., Wang, F., Yang, Z., & Tang, C. Y. (2022) · Environmental Science & Technology · doi:10.1021/acs.est.2c04736 · Cited by 355
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Metadata
- Authors
- Yang, Z., Wu, Y., Wang, J., Cao, B., & Tang, C. Y.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2016-08-11
- Volume
- 50
- Issue
- 17
- Pages
- 9543-9550
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2482614146
- Cited by
- 228
- References
- 2
- FWCI
- 12.53
- Type
- journal article
- Language
- en
- Open access
- closed
- Funders
- Research Grants Council, University Grants Committee, Hong Kong (17207514)
- University of Hong Kong
- Innovation and Technology Commmission (ITS/208/14)
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- Yang, Z., Wu, Y., Wang, J., Cao, B., & Tang, C. Y. (2016). In Situ Reduction of Silver by Polydopamine: A Novel Antimicrobial Modification of a Thin-Film Composite Polyamide Membrane. Environmental Science & Technology. https://doi.org/10.1021/acs.est.6b01867
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
