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Influence of diameter of carbon nanotubes mounted in flow-through capacitors on removal of NaCl from salt water

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Abstract

Flow-through capacitor (FTC) with carbon nanotube (CNT) electrode was employed to remove NaCl from saltwater solution. According to the investigation by transmission electron microscopy (TEM) and nitrogen adsorption, the BET specific surface area of CNT electrodes decreased with increasing nanotube diameter, which had a narrow distribution in each sample. Besides, removal of NaCl per unit weight of CNT electrode increased linearly with the BET specific surface area of CNT electrodes. As a result, CNT electrode with the smallest nanotube diameter had the best removal characteristic, with removal efficiency up to 95% and energy-consumption of 3.0 Wh L−1, and the process of regeneration could be carried out easily in a short time. Comparing removal experiment with charge/discharge test, it was concluded that FTC based on the same electro-adsorption theory as double layer capacitors. The cyclic voltammograms of CNT electrode in salt water showed that the current occurred by adsorption and desorption of ions in the range of −0.3–0.9 V, which directly explained the reason why CNT electrode could be used to remove NaCl.

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Acknowledgements

The authors acknowledge the supports of the National High Technology Research and Development Program (863 Program) of China (2002AA302302) and Shanghai NanoScience & Techology Special Project (0223nm001).

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Authors and Affiliations

  1. School of Material Science and Engineering, Shanghai University, Shanghai, 200444, PR China

    Dengsong Zhang, Liyi Shi, Jianhui Fang & Kai Dai

  2. School of Science, Shanghai University, Shanghai, 200444, PR China

    Dengsong Zhang, Liyi Shi & Jianhui Fang

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  1. Dengsong Zhang
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  2. Liyi Shi
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  3. Jianhui Fang
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  4. Kai Dai
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Correspondence to Dengsong Zhang.

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Zhang, D., Shi, L., Fang, J. et al. Influence of diameter of carbon nanotubes mounted in flow-through capacitors on removal of NaCl from salt water. J Mater Sci 42, 2471–2475 (2007). https://doi.org/10.1007/s10853-006-1293-z

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  • DOI: https://doi.org/10.1007/s10853-006-1293-z

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