Nanofiltration of Electrolyte Solutions by Sub-2nm Carbon Nanotube Membranes

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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 ... continued below

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6 p. (0.2 MB)

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Fornasiero, F; Park, H G; Holt, J K; Stadermann, M; Kim, S; In, J B et al. March 13, 2008.

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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.

Physical Description

6 p. (0.2 MB)

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PDF-file: 6 pages; size: 0.2 Mbytes

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  • Presented at: NSTI Nanotech 2008, Boston, MA, United States, Jun 01 - Jun 05, 2008

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  • Report No.: LLNL-PROC-402246
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 945137
  • Archival Resource Key: ark:/67531/metadc901372

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  • March 13, 2008

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • April 17, 2017, 12:13 p.m.

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Fornasiero, F; Park, H G; Holt, J K; Stadermann, M; Kim, S; In, J B et al. Nanofiltration of Electrolyte Solutions by Sub-2nm Carbon Nanotube Membranes, article, March 13, 2008; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc901372/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.