Retention of copper(II)-EDTA chelates from dilute aqueous solutions by a polyelectrolyte-enhanced ultrafiltration process

Ruey Shin Juang*, Ming Nan Chen

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

45 Scopus citations

Abstract

The retention behavior of copper(II)-ethylenediaminetetraacetic acid (EDTA) chelates in dilute aqueous solutions ([Cu2+] = 0.5-4 mM) by ultrafiltration was studied with the help of a basic polyelectrolyte, polyethylenimine (PEI). The regenerated cellulose Amicon YM10 and YM30 were used as ultrafilters. Experiments were performed in a stirred batch cell as a function of aqueous pH (2-10), the concentration ratios of EDTA to copper ions (0.5-4) and of PEI to copper ions (2.5-20), and the applied pressure (0.68-3.40 atm). The best conditions for rejection coefficient greater than 97% equivalent to 7 ppm copper chelates were obtained. The effect of inorganic salts such as NaCl, CaCl2, and Na2SO4 on the retention was also examined. In addition, the membrane fouling during ultrafiltration was analyzed by modified fouling index. The regeneration method of PEI from the retentate is finally discussed.

Original languageEnglish
Pages (from-to)25-37
Number of pages13
JournalJournal of Membrane Science
Volume119
Issue number1
DOIs
StatePublished - 02 10 1996
Externally publishedYes

Keywords

  • Copper(II)-EDTA chelates
  • Polyethylenimine
  • Retention
  • Ultrafiltration

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