Advances and perspectives in integrated membrane capacitive deionization for water desalination

Qinghao Wu, Dawei Liang, Shanfu Lu, Haining Wang, Yan Xiang, Doron Aurbach, Eran Avraham, Izaak Cohen

Research output: Contribution to journalReview articlepeer-review

Abstract

Capacitive deionization (CDI) has been considered as the most promising and environmentally friendly electrical desalination technology owing to its low energy consumption and no secondary pollution. CDI is based on the principle of electric double layer for salt ion adsorption, but the existence of co-ions repulsion reduce the charge efficiency, leading to the low salt adsorption capacity. To prevent the intrinsic “co-ion effect” inside the porous carbon electrodes, membrane capacitive deionization (MCDI) by applying an ion-exchange membrane (IEM) to the surface of electrode is of increasing interest. However, MCDI brings various resistances, such as the internal and interface resistances of membrane, as well as the contact resistance between membrane and carbon electrode. More recently, by integrating “membrane” with carbon electrode without the introduction of free-standing IEM, integrated-MCDI has shown great merits to enhance counter-ion selectivity of electrode and decrease resistance, resulting in improving adsorption rate and reducing energy consumption. In this review, the preparation methods of innovative electrodes, the working mechanisms and performances of integrated-MCDIs, and the advanced advantages are summarized. It is hoped that this work will provide insight into integrated-MCDI and shed light on the future direction of water desalination based on CDI technology.

Original languageEnglish
Article number116043
JournalDesalination
Volume542
DOIs
StatePublished - 15 Nov 2022

Keywords

  • Capacitive deionization
  • Charge efficiency
  • Co-ion effect
  • Integrated membrane capacitive deionization
  • Membrane capacitive deionization

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Water Science and Technology
  • General Chemical Engineering
  • Mechanical Engineering
  • General Materials Science

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