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Unraveling the role of field strength on Sr2+ removal in flow-electrode capacitive deionization systems
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DOI：10.1016/j.seppur.2025.133432.png)
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Abstract
En 中文
With the widespread application of nuclear energy, the risk of radioactive wastewater containing Sr2+ is increasing. Flow-electrode capacitive deionization (FCDI) based on carbonaceous materials is an emerging desalination technique with great promise for treating micro-polluted Sr2+ wastewater. However, understanding of the key factors that govern the performance is still lacking due to complex mass and electron transfer across multi-scales. Herein, we elucidated the influence of the electric-, concentration-and heat-fields on the deionization performance in FCDI, through which a strategy to enhance the performance for selective removal of Sr2+ was developed. Such a strategy was fulfilled by first constructing flowing electrodes using two types of onedimensional carbon nanomaterials with similar pore structure but differ significantly in electrical conductivity. By optimizing properties of the flowing electrode and operation conditions, the driving forces originated from electric-, concentration-and heat-fields were enhanced, delivering a high removal rate of 5.29 mu g SrCl2 cm(-2) min(-1) and a low energy consumption of 2.89 J g(-1) SrCl2. The effects of field strength unraveled and the FCDI system constructed in this study would pave the way for practical applications of this technology.
Keywords:
Capacitive deionization
Flowing electrode
Sr2+ removal
Electric field
Concentration field
Journal
IF:
9
Papers:
2.9W
Citations:
12.1W
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