The DOI matches its Crossref record; 1 of the 1 references it cites were found in a registry or an index.
Mechanism of Selective Ion Removal in Membrane Capacitive Deionization for Water Softening
Abstract
Capacitive deionization (CDI) is an emerging technology capable of selective removal of ions from water. While many studies have reported chemically tailored electrodes for selective ion removal, the selective removal of divalent cations (i.e., hardness) over monovalent cations can simply be achieved using membrane CDI (MCDI) equipped with ion exchange membranes (IEMs). In this study, we use both experimental and modeling approaches to systematically investigate the selective removal of Ca 2+ over Na + . Specifically, the impacts of current density, hydraulic retention time, and feed composition on the selectivity of Ca 2+ over Na + were investigated. The results from our study suggest a universal correlation between the ratio of molar fluxes and the ratio of spacer channel ion concentrations, regardless of operating conditions and feed composition. Our analysis also reveals inherent and universal trade-off relationships between selectivity and the Ca 2+ removal rate and between selectivity and the degree of Ca 2+ removal. This fundamental understanding of the mechanism of selective ion removal in MCDI can also be applied to flow-electrode CDI processes that employ IEMs.
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Citations
Cites
Desalination via a New Membrane Capacitive Deionization Process Utilizing Flow-Electrodes
Jeon, S.-I., Park, H.-R., Yeo, J.-G., Yang, S., Cho, C. H., Han, M. H., & Kim, D. K. (2013) · Energy & Environmental Science · doi:10.1039/c3ee24443a · Cited by 727
Cited by
Recent advances in ion selectivity with capacitive deionization
Gamaethiralalage, J. G., Singh, K., Sahin, S., Yoon, J., Elimelech, M., Suss, M. E., Liang, P., Biesheuvel, P. M., Zornitta, R. L., & de Smet, L. C. P. M. (2021) · Energy & Environmental Science · doi:10.1039/d0ee03145c · Cited by 506
Zhang, C., Ma, J., Wu, L., Sun, J., Wang, L., Li, T., & Waite, T. D. (2021) · Environmental Science & Technology · doi:10.1021/acs.est.0c06552 · Cited by 323
Self-citationEmerging electrochemical processes for materials recovery from wastewater: Mechanisms and prospects
Kong, L., & Liu, X. (2020) · Frontiers of Environmental Science & Engineering · doi:10.1007/s11783-020-1269-2 · Cited by 53
Selective Ion Removal by Capacitive Deionization (CDI)-Based Technologies
Chai, S., Xi, J., Chen, L., He, W., Shen, J., & Gong, H. (2022) · Processes · doi:10.3390/pr10061075 · Cited by 43
Yoon, H., Jeon, S., Min, T., Lee, C. K., & Lee, G. (2024) · Journal of Environmental Chemical Engineering · doi:10.1016/j.jece.2024.114259 · Cited by 19
Metadata
- Authors
- Wang, L., & Lin, S.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2019-04-23
- Volume
- 53
- Issue
- 10
- Pages
- 5797-5804
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2940852956
- Cited by
- 172
- References
- 1
- FWCI
- 7.38
- Type
- journal article
- Language
- en
- Open access
- closed
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