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Journal of the Iranian Chemical Society

, Volume 15, Issue 5, pp 1199–1205 | Cite as

C-dots/Fe3O4 magnetic nanocomposite as nanoadsorbent for removal of heavy metal cations

  • Azam Masoudi
  • Fatemeh Honarasa
Original Paper

Abstract

In this work, C-dots/Fe3O4 magnetic nanocomposite as nanoadsorbent was implemented for adsorption of Cu(II), Cr(III) and Pb(II) cations from aqueous solutions. The effect of various parameters on adsorption process of all three mentioned cations such as nanoadsorbent dosage, initial cation concentration, contact time and pH were explored to find the mechanism of adsorption. Different kinetic models including pseudo-first-order, pseudo-second-order, Elovich and intra-particle diffusion kinetic models were used to fit experimental data. In this way, pseudo-second-order model described the kinetic data of all three cations well. Also, equilibrium isotherm studies were examined by application of different conventional isotherms such as Langmuir, Freundlich, Tempkin and Dubinin–Radushkevich models to explain the experimental data. The Freundlich isotherm fitted equilibrium data of all three cations, whereas other models were not fitted well. Results indicate that the adsorption of all three cations is followed by chemisorption mechanism via electrostatic attraction at heterogeneous surface of nanoadsorbent.

Keywords

C-dots/Fe3O4 nanocomposite Carbon quantum dots Magnetic nanostructure Heavy metals Nanoadsorbent 

Notes

Acknowledgements

The authors wish to acknowledge the support of this work by Islamic Azad University (Shiraz Branch) and Iran National Science Foundation (INSF).

Supplementary material

13738_2018_1318_MOESM1_ESM.docx (244 kb)
Supplementary material 1 (DOCX 244 kb)

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Copyright information

© Iranian Chemical Society 2018

Authors and Affiliations

  1. 1.Department of Chemistry, Shiraz BranchIslamic Azad UniversityShirazIran

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