Research on the desalination kinetics of carbon tableting electrodes for capacitive deionization water purification

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Abstract
The global water scarcity crisis is escalating, necessitating the urgent development of innovative water treatment technologies to address freshwater shortages. Capacitive Deionization (CDI) stands out due to its efficient and environmentally friendly advantages. In the application of CDI, researching electrode materials to achieve higher adsorption capacities is crucial. Tableting electrodes have advantages as they can increase mass loading, but they are seldom discussed in the field of capacitive water purification. Therefore, this study applies tableting electrodes to CDI, breaking through the low mass loading bottleneck (50 mg cm− 2), and explores their desalination effect and kinetics. We found that at a voltage window of 0–1.2 V and a flow rate of 10 ml min− 1, tableting electrodes had the best desalination effect. The desalination ability in different salt solutions is greatly influenced by ion diffusion performance, with the best performance observed in LiCl solution (8.9 mg g− 1). Additionally, the manufacturing process of tableting electrodes has the advantages of simple operation, environmental friendliness, and low cost. This study explores for the first time the kinetics and desalination effect of tableting electrodes in CDI devices, providing informational references for the application of tableting electrodes in capacitive desalination.
Funding Information
  • Yunnan Provincial Department of Education Scientific Research Fund Projects (2024Y342)
  • the National Natural Science Foundation Project (12064050, 12064050)
  • the key R&D Plan of Yunnan Province (202203AC100004)
  • High-Level Talents Introduction Plan (YNQR-QNRC-2020-004)

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