Separation and removal of metal ions from dilute solutions using micellar-enhanced ultrafiltration

Ruey Shin Juang*, Yong Yan Xu, Ching Liang Chen

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

171 Scopus citations


The removal of single metal ions including Cs+, Sr2+, Mn2+, Co2+, Cu2+, Zn2+, and Cr3+ from aqueous solutions (up to 200mg/l) by ultrafiltration (UF) with the help of an anionic surfactant sodium dodecyl sulfate (SDS) was investigated. Experiments were performed as a function of the membrane MWCO (1000-8000) and material (polyamide, polyethersulfone), solution pH (2-12), and molar concentration ratio of the surfactant to metals (the S/M ratio, 0.5-27). It was shown that complete removal of metal ions, except for monovalent Cs+, could be achieved as long as the SDS micelles were formed. The effects of added electrolyte NaCl and the transmembrane pressure (TMP) on metal rejection were also examined. The potential of this UF process for the separation of binary metals involving Sr2+ or Cr3+ was particularly demonstrated using a low-MWCO membrane (1000) and at a relatively low S/M ratio (<5-10). The recovery and reuse of surfactant from the retentate was finally studied.

Original languageEnglish
Pages (from-to)257-267
Number of pages11
JournalJournal of Membrane Science
Issue number1-2
StatePublished - 01 07 2003
Externally publishedYes


  • Co(II)
  • Cr(III)
  • Cs(I)
  • Cu(II)
  • Metal separation
  • Micellar-enhanced ultrafiltration
  • Mn(II)
  • SDS
  • SDS recovery
  • Sr(II)
  • Zn(II)


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