Influence of solute concentration and dipole moment on the retention of uncharged molecules with nanofiltration

Jason Shirley, Stephen Mandale, Viktor Kochkodan

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The molecular weight cut-off .MWCO) is an important parameter used in the selection of membranes for specific filtration tasks. The MWCO is also used as a parameter in various membrane models. In this study the MWCO of an NTR 7450 nanofiltration membrane was investigated by filtration experiment and calculation of the rejection of neutral molecules as a function of solute molecular weight. The results were compared to a reflection coefficient model and it was shown that increasing the solute concentration decreased the MWCO value, indicating that MWCO was not a constant parameter but was dependent on concentration. The dipole moment of a solute molecule was also found to have an effect on the membrane's MWCO. The results showed that molecules with a large dipole moment caused rejection to increase with an increase in solute concentration.

Original languageEnglish
Pages (from-to)116-122
Number of pages7
JournalDesalination
Volume344
DOIs
Publication statusPublished - 1 Jul 2014
Externally publishedYes

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Keywords

  • Dipole moment
  • Molecular weight cut-off
  • Nanofiltration

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)
  • Water Science and Technology
  • Mechanical Engineering

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