Nanofiltration of electrolyte solutions by sub-2nm carbon nanotube membranes

Francesco Fornasiero, Hyung Gyu Park, Jason K. Holt, Michael Stadermann, Sangil Kim, Jung Bin In, Costas P. Grigoropoulos, Aleksandr Noy, Olgica Bakajin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Both MD simulations and experimental studies have shown that liquid and gas flow through carbon nanotubes with nanometer size diameter is exceptionally fast. For applications in separation technology, selectivity is required together with fast flow. In this work, we use pressure-driven filtration experiments to study ion exclusion in silicon nitride/sub-2-nm CNT composite membranes as a function of solution ionic strength, pH, and ion valence. We show that carbon nanotube membranes exhibit significant ion exclusion at low salt concentration. Our results support a rejection mechanism dominated by electrostatic interactions between fixed membrane charges and mobile ions, while steric and hydrodynamic effects appear to be less important. Comparison with commercial nanofiltration membranes for water softening reveals that our carbon nanotube membranes provides far superior water fluxes for similar ion rejection capabilities.

Original languageEnglish (US)
Title of host publicationTechnical Proceedings of the 2008 NSTI Nanotechnology Conference and Trade Show, NSTI-Nanotech, Nanotechnology 2008
Pages106-109
Number of pages4
Volume2
StatePublished - 2008
Externally publishedYes
Event2008 NSTI Nanotechnology Conference and Trade Show, NSTI Nanotech 2008 Joint Meeting, Nanotechnology 2008 - Quebec City, QC, United States
Duration: Jun 1 2008Jun 5 2008

Other

Other2008 NSTI Nanotechnology Conference and Trade Show, NSTI Nanotech 2008 Joint Meeting, Nanotechnology 2008
CountryUnited States
CityQuebec City, QC
Period6/1/086/5/08

Keywords

  • Carbon nanotube
  • Fast flow
  • Ion exclusion
  • Membrane

ASJC Scopus subject areas

  • Mechanical Engineering

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  • Cite this

    Fornasiero, F., Park, H. G., Holt, J. K., Stadermann, M., Kim, S., In, J. B., Grigoropoulos, C. P., Noy, A., & Bakajin, O. (2008). Nanofiltration of electrolyte solutions by sub-2nm carbon nanotube membranes. In Technical Proceedings of the 2008 NSTI Nanotechnology Conference and Trade Show, NSTI-Nanotech, Nanotechnology 2008 (Vol. 2, pp. 106-109)