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Environmental Science and Pollution Research

, Volume 22, Issue 18, pp 14201–14208 | Cite as

Directing carbon nanotubes from aqueous phase to o/w interface for heavy metal uptaking

  • Lili Gao
  • Huayi Yin
  • Xuhui Mao
  • Hua Zhu
  • Wei Xiao
  • Dihua Wang
Research Article

Abstract

Separation and reuse of dispersed nanoparticles are major obstacles to the extensive application of nano-sized absorbents in wastewater treatment. Herein, we demonstrate the capability of directing acid-oxidized carbon nanotubes (CNTs) as the transfer vehicles of heavy metal ions from simulated wastewater. The heavy metal-loaded CNTs can be readily separated from the aqueous phase via the aggregation process at an oil/water (o/w) interface. The minimum surfactant amount to achieve 99 % transfer ratio (T r) of 100 mg/L CNTs from water phase to o/w interface was ∼0.01 mM. The adsorption experiments showed that the removal efficiency of the divalent lead ions increased with an increase in CNT mass, and the subsequent addition of cetyltrimethylammonium bromide (CTAB) surfactant did not negatively impact the removal of soluble divalent lead species (Pb(II)). In a wide region of pH and ionic strength, both the decontamination of Pb(II) and the transfer of CNTs from water phase to o/w interface can be accomplished successively. The method presented in this study may be developed as a generic one for collecting or recycling the pollutant-loaded nano-sized absorbents.

Keywords

Carbon nanotube Adsorption Wastewater treatment Aggregation o/w interface 

Notes

Acknowledgments

The authors are grateful to the financial support from NSFC (51278386), MOE (NCET-08-0416), Shanxi Scholarship Council of China (2013-041), and Shanxi Province Science Foundation for Youths (2013021011-3). The authors also appreciated Dr. J. F. Dong and Dr. X. F. Li for zeta potential measurements.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.School of Resource and Environmental ScienceWuhan UniversityWuhanPeople’s Republic China
  2. 2.School of Environmental Science and EngineeringTaiyuan University of TechnologyTaiyuanPeople’s Republic China

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