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Environmental Science and Pollution Research

, Volume 24, Issue 12, pp 11764–11778 | Cite as

Application of a novel magnetic carbon nanotube adsorbent for removal of mercury from aqueous solutions

  • Farshid Homayoon
  • Hossein FaghihianEmail author
  • Firoozeh Torki
Research Article

Abstract

In this research, multiwall carbon nanotube was magnetized and subsequently functionalized by thiosemicarbazide. After characterization by FTIR, BET, SEM, EDAX, and VSM techniques, the magnetized adsorbent (multi-walled carbon nanotubes (MWCNTs)/Fe3O4) was used for removal of Hg2+ from aqueous solutions and the experimental conditions were optimized. The adsorption capacity of 172.83 mg g−1 was obtained at 25 °C and pH = 3 which was superior to the value obtained for initial multiwall carbon nanotube, magnetized sample, and many previously reported values. In the presence of Pb+2 and Cd+2, the adsorbent was selective towards mercury when their concentration was respectively below 50 and 100 mg L−1. The adsorption process was kinetically fast and the equilibration was attained within 60 min with 69.5% of the capacity obtained within 10 min. The used adsorbent was regenerated by HNO3 solution, and the regenerated adsorbent retained 92% of its initial capacity. The magnetic sensitivity of the adsorbent allowed the simple separation of the used adsorbent from the solution by implying an appropriate external magnetic field. The adsorption data was well fitted to the Langmuir isotherm model, indicating homogeneous and monolayer adsorption of mercury by the adsorbent.

Keywords

Mercury Magnetized carbon nanotubes Functionalization Thiosemicarbazide Adsorption 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Farshid Homayoon
    • 1
  • Hossein Faghihian
    • 1
    Email author
  • Firoozeh Torki
    • 1
  1. 1.Department of ChemistryIslamic Azad UniversityShahrezaIran

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