Removal of toxic metal ions using chitosan coated carbon nanotube composites for supercapacitors

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  • ReceivedNov 30, 2017
  • AcceptedMar 2, 2018
  • PublishedApr 10, 2018


Funded by

National Natural Science Foundation of China(51602182,21535004,21390411)

Shandong Provincial Natural Science Foundation(ZR2016EMQ02,ZR2016BP07)


This work was supported by the National Natural Science Foundation of China (51602182, 21535004, 21390411) and Shandong Provincial Natural Science Foundation (ZR2016EMQ02, ZR2016BP07).

Interest statement

The authors declare that they have no conflict of interest.

Contributions statement

These authors contributed equally to this work.


Supporting Information

The supporting information is available online at chem.scichina.com and link.springer.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.


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  • Figure 1

    SEM images of F-CNTs (a, b) and CHIT/F-CNTs (c, d).

  • Scheme 1

    Schematic illustration of the formation process of metal-carbon nanotube hybrid structures (color online).

  • Figure 2

    TEM images of (a–c) F-CNTs and (d–f) CHIT/F-CNTs (color online).

  • Figure 3

    XPS (a) and FTIR (b) spectra of the samples (color online).

  • Figure 4

    (a) Adsorption isotherms of Cr(VI) and Cu(II) with concentrations from 20 to 400 mg L−1 by CHIT/F-CNTs; (b) equilibrium adsorption capacity of different samples in metal aqueous solutions (color online).

  • Figure 5

    XRD patterns of Cr-CHIT/F-CNTs, Cu-CHIT/F-CNTs and CHIT/F-CNTs after carbonization (color online).

  • Figure 6

    CV curves of CHIT/F-CNTs after carbonization (a), Cr-CHIT/F-CNTs (b), and Cu-CHIT/F-CNTs (c) at various scan rates in 0.5 mol L−1 H2SO4 aqueous electrolyte; (d) specific capacitance as a function of scan rate (color online).

  • Figure 7

    Charge-discharge curves of CHIT/F-CNTs after carbonization (a), Cr-CHIT/F-CNTs (b), and Cu-CHIT/F-CNTs (c); (d) specific capacitance as a function of current density (color online).

  • Table 1   Adsorption isotherm parameters of Freundlich and Langmuir models for Cr(VI) and Cu(II) ions on CHIT/F-CNTs

    Isotherm Parameters



    qm(mg g−1)

    KL(L mg−1)



    KF(L g−1)