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

  • Pin Hao
  • Xiaoye Ma
  • Junfeng Xie
  • Fengcai Lei
  • Liyi Li
  • Wenqian Zhu
  • Xin Cheng
  • Guanwei Cui
  • Bo Tang
Articles
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Abstract

Environmental pollution and energy crisis are two major global challenges to human beings. Recovering energy from wastewater is considered to be one of the effective approaches to address these two issues synchronously. As the main pollutants in wastewater, toxic heavy metal ions are the potential candidates for energy storage devices with pseudocapacitive behaviors. In this study, toxic metal ions of Cr(VI) and Cu(II) are removed efficiently by chitosan coated oxygen-containing functional carbon nanotubes, and the corresponding equilibrium adsorption capacity is 142.1 and 123.7 mg g−1. Followed by carbonization of metal ions-adsorbed adsorbents, Cu- and CrN-loaded carbon composites can be obtained. Electrochemical measurements show that the supercapacitor electrodes based on Cu- and CrN-loaded carbon composites have specific capacitance of 144.9 and 114.9 F g−1 at 2 mV s−1, with superior electrochemical properties to pure chitosan coated carbon nanotubes after carbonization. This work demonstrates a new strategy for the resource-utilization of other heavy metal ions for energy devices, and also provides a new way to turn environmental pollutants into clean energy.

Keywords

heavy metal ions adsorption chitosan coated carbon nanotube supercapacitor 
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Notes

Acknowledgments

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

Supplementary material

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Pin Hao
    • 1
  • Xiaoye Ma
    • 1
  • Junfeng Xie
    • 1
  • Fengcai Lei
    • 1
  • Liyi Li
    • 2
  • Wenqian Zhu
    • 1
  • Xin Cheng
    • 1
  • Guanwei Cui
    • 1
  • Bo Tang
    • 1
  1. 1.College of Chemistry, Chemical Engineering and Materials Science, Institute of Materials and Clean Energy, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Provincial Key Laboratory of Clean Production of Fine ChemicalsShandong Normal UniversityJinanChina
  2. 2.Intel CorporationHillsboroUSA

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