Volume 37 Issue 2
Mar.  2022
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Zu Rong Ang, Ing Kong, Rachel Shin Yie Lee, Cin Kong, Akesh Babu Kakarla, Ai Bao Chai, Wei Kong. Preparation of 3D graphene-carbon nanotube-magnetic hybrid aerogels for dye adsorption. New Carbon Mater., 2022, 37(2): 424-434. doi: 10.1016/S1872-5805(21)60029-X
Citation: Zu Rong Ang, Ing Kong, Rachel Shin Yie Lee, Cin Kong, Akesh Babu Kakarla, Ai Bao Chai, Wei Kong. Preparation of 3D graphene-carbon nanotube-magnetic hybrid aerogels for dye adsorption. New Carbon Mater., 2022, 37(2): 424-434. doi: 10.1016/S1872-5805(21)60029-X

Preparation of 3D graphene-carbon nanotube-magnetic hybrid aerogels for dye adsorption

doi: 10.1016/S1872-5805(21)60029-X
Funds:  The authors gratefully acknowledge the facilities, the scientific and technical assistance of Engineering Research Department, University of Nottingham Malaysia and School of Applied Physics, National University of Malaysia
More Information
  • Corresponding author:

    Ing Kong, Associate professor. E-mail: I.Kong@latrobe.edu.au

  • Received Date: 2020-05-29
  • Rev Recd Date: 2020-07-30
  • Available Online: 2021-03-17
  • Publish Date: 2022-03-30
  • Novel hybrid aerogels were prepared by adding ZnCl2, NiCl2·6H2O, FeCl2·4H2O and FeCl3·6H2O to a suspension of equal weights of graphene oxide and oxidized carbon nanotubes, followed by co-precipitation under basic conditions. The aerogels were then crosslinked with polyvinyl alcohol in water and freeze-dried. They consisted of magnetic Ni0.5Zn0.5Fe2O4 nanoparticles, graphene oxide, carbon nanotubes and polyvinyl alcohol, which have active sites that attract dye molecules and could be extracted from water by applying a magnetic field. Using optimum mass ratios of ZnCl2/NiCl2·6H2O/FeCl2·4H2O/FeCl3·6H2O/(graphene oxide+oxidized carbon nanotube) at 6∶6∶12∶12∶1, the hybrid aerogel has a high adsorption capacity of 71.03 mg g−1 for methylene blue and a moderate magnetic strength of MS = 3.519 emu g−1. Its removal efficiencies for methylene blue, methyl orange, crystal violet and a mixture of equal masses of the three were 70.1%, 4.2%, 8.9% and 11.1%, respectively for the same dye concentration of 0.025 mg mL−1. It could be used for 3 regeneration cycles with a regeneration efficiency of over 82%. It was also not toxic to the living organisms, suggesting that it is a promising adsorbent for treating industrial wastewater.

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