Capacitive Deionization -- defining a class of desalination technologies

Authors: P. M. Biesheuvel, M. Z. Bazant, R. D. Cusick, T. A. Hatton, K. B. Hatzell, M. C. Hatzell, P. Liang, S. Lin, S. Porada, J. G. Santiago, K. C. Smith, M. Stadermann, X. Su, X. Sun, T. D. Waite, A. van der Wal, J. Yoon, R. Zhao, L. Zou, M. E. Suss

arXiv: 1709.05925v1 - DOI (physics.app-ph)

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In recent years, the field of water desalination has seen a surge in attention towards capacitive deionization (CDI), which can now be considered as an important technology class alongside reverse osmosis and electrodialysis. These methods involve electrically driven removal of ions from a feed stream, storage in an electrode through ion electrosorption, and release in charge/discharge cycles. By grouping all these methods under the technology class of CDI, it is possible to treat evolving new technologies in standardized terms and compare them to other technologies in the same class. A recent study by P.M. Biesheuvel et al., titled "Capacitive Deionization -- defining a class of desalination technologies," delves deeper into this topic. The study highlights how CDI has become an important technology for water desalination due to its low energy consumption, high efficiency, and ability to operate at low pressures. Additionally, CDI systems have been shown to effectively remove various types of ions from aqueous solutions such as seawater or brackish water. The authors note that while there are variations among CDI systems, they all rely on electrostatic forces between charged electrodes and ions in solution for their operation. Furthermore, they discuss how grouping these systems under the umbrella term "CDI" allows for easier comparison between different technologies within this class. Overall, this study emphasizes the importance of capacitive deionization as a viable technology for water desalination and highlights its potential for future development and improvement.
AI-generated keywords: Capacitive Deionization Desalination Electrode Ions Low Energy

AI-generated Key Points

  • Capacitive deionization (CDI) is an important technology class for water desalination
  • CDI involves electrically driven removal of ions from a feed stream, storage in an electrode through ion electrosorption, and release in charge/discharge cycles
  • CDI has low energy consumption, high efficiency, and can operate at low pressures
  • CDI systems have been shown to effectively remove various types of ions from aqueous solutions such as seawater or brackish water
  • Grouping all CDI methods under one technology class allows for easier comparison between different technologies within this class
  • The study emphasizes the importance of capacitive deionization as a viable technology for water desalination and highlights its potential for future development and improvement.
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Abstract: Over the past decade, capacitive deionization (CDI) has realized a surge in attention in the field of water desalination and can now be considered as an important technology class, along with reverse osmosis and electrodialysis. While many of the recently developed technologies no longer use a mechanism that follows the strict definition of the term "capacitive", these methods nevertheless share many common elements that encourage treating them with similar metrics and analyses. Specifically, they all involve electrically driven removal of ions from a feed stream, storage in an electrode (i.e., ion electrosorption) and release, in charge/discharge cycles. Grouping all these methods in the technology class of CDI makes it possible to treat evolving new technologies in standardized terms and compare them to other technologies in the same class.

Submitted to arXiv on 18 Jul. 2017

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