Characterization of carbon nano-Onions for heavy metal ion remediation

Megan B. Seymour, Chunming Su, Yang Gao, Yongfeng Lu, Yusong Li

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Carbonaceous nanomaterials, such as fullerene C 60, carbon nanotubes, and their functionalized derivatives have been demonstrated to possess high sorption capacity for organic and heavy metal contaminants, indicating a potential for remediation application. The actual application of these nanomaterials, however, is often hindered by the high cost of materials and the limited understanding of their mobility in porous media. In this work, carbon nanoonions (CNOs), a relatively new addition to the carbonaceous nanomaterials, were synthesized in a cost-effective way using a laser-assisted combustion synthesis process, and carefully characterized for their potential remediation application. Surface oxidized CNOs possessed 10 times higher sorption capacity than C 60 for heavy metal ion contaminants including Pb 2+, Cu2-, Cd 2+, Ni 2+, and Zn 2+. CNOs aqueous suspension can be very stable in NaCl solution at ionic strength up to 30 mM and CaCl 2 solution at ionic strength up to 4 mM CaCl 2 when pH ranged from 5 to 9, which are consistent with environmentally relevant conditions. Interactions of CNOs with iron oxide and silica surfaces under favorable condition were found to be electrostatic in origin. Mobility of CNOs in quartz sands was controlled by electrolyte type and concentration. Approximately 4.4, 25.1, and 92.5 %of injected CNO mass were retained in the sand column in ultrapure water, 1 mM NaCl, and 1 mM CaCl 2 solutions, respectively.

Original languageEnglish (US)
Article number1087
JournalJournal of Nanoparticle Research
Volume14
Issue number9
DOIs
StatePublished - 2012

Keywords

  • Carbon nano-Onions
  • Characterization
  • Heavy metal ion
  • Mobility
  • Sorption

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Modeling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

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