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Environmental Science and Pollution Research

, Volume 24, Issue 17, pp 14735–14747 | Cite as

Removal of heavy metal ions from wastewaters using dendrimer-functionalized multi-walled carbon nanotubes

  • Daniela IannazzoEmail author
  • Alessandro Pistone
  • Ida Ziccarelli
  • Claudia Espro
  • Signorino Galvagno
  • Salvatore V Giofré
  • Roberto Romeo
  • Nicola Cicero
  • Giuseppe D Bua
  • Giuseppe Lanza
  • Laura Legnani
  • Maria A ChiacchioEmail author
Research Article

Abstract

Dendrimer-functionalized multi-walled carbon nanotubes (MWCNT) for heavy metal ion removal from wastewaters were developed. Triazole dendrimers (TD) were built directly onto the carbon nanotube surface by successive click chemistry reactions affording the zero- and first-generation dendrimer-functionalized MWCNT (MWCNT-TD1 and MWCNT-TD2). The Moedritzer-Irani reaction carried out on the amino groups present on the MWCNT-TD2 sample gave the corresponding α-aminophosphonate nanosystem MWCNT-TD2P. Both MWCNT-TD2 and MWCNT-TD2P nanosystems have been characterized by physical, chemical, and morphological analyses. Their chelating abilities towards the toxic metal ions Pb2+, Hg2+, and Ni2+ and the harmless Ca2+ ion have been experimentally evaluated in the two different sets of experiments and at the salt concentrations of 1 mg/mL or 1 μg/mL by inductively coupled plasma mass spectrometry (ICP-MS). The results of these studies pointed out the interesting chelating behavior for the phosphonated nanosystem towards the Hg2+ ion. The complexation mode of the best chelating system MWCNT-TD2P with mercury was investigated through density functional theory (DFT) calculations, suggesting a chelation mechanism involving the two oxygen atoms of the phosphate group. The synthesized dendrimers, supported on the multi-walled carbon nanotubes, have shown the potential to be used for the selective toxic metal ion removal and recovery.

Keywords

Multi-walled carbon nanotubes Triazole-based dendrimers α-Aminophosphonates Heavy metal chelators DFT calculations Wastewater treatment 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Daniela Iannazzo
    • 1
    Email author
  • Alessandro Pistone
    • 1
  • Ida Ziccarelli
    • 1
  • Claudia Espro
    • 1
  • Signorino Galvagno
    • 1
  • Salvatore V Giofré
    • 2
  • Roberto Romeo
    • 2
  • Nicola Cicero
    • 3
  • Giuseppe D Bua
    • 3
  • Giuseppe Lanza
    • 4
  • Laura Legnani
    • 4
    • 5
  • Maria A Chiacchio
    • 4
    • 5
    Email author
  1. 1.Dipartimento di IngegneriaUniversity of MessinaMessinaItaly
  2. 2.Dipartimento di Scienze chimiche, biologiche, farmaceutiche ed ambientaliUniversity of MessinaMessinaItaly
  3. 3.Dipartimento di Scienze biomediche, odontoiatriche e delle immagini morfologiche e funzionaliUniversity of MessinaMessinaItaly
  4. 4.Dipartimento di Scienze del FarmacoUniversity of CataniaCataniaItaly
  5. 5.Dipartimento di ChimicaUniversity of PaviaPaviaItaly

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