Impregnation and Characterization of High Performance Extraction Columns for Separation of Metal Ions

Dejene Kifle, Grethe Wibetoe, Morten Froseth, Jonas Bigelius

Research output: Contribution to journalArticlepeer-review

Abstract

Impregnation behaviors of reverse-phase silica materials and C18-silica HPLC columns were studied using di-(2-ethylhexyl)phosphoric acid (HDEHP) as a model extractant. Initially, the adsorption efficiency of the ligand on different types of bulk particles was investigated using various concentration of HDEHP in different composition of methanol/water mixtures based on a batch technique. Subsequently, impregnation of HPLC columns was performed using the dynamic flow-through technique. The experimental data fitted well to the Langmuir model and the adsorption isotherms from the flow-through experiment were used to prepare extraction columns of different ligand densities. Finally, the impregnated columns were characterized and validated through HPLC separation of the lanthanides.
Original languageEnglish
Pages (from-to)668-682
JournalSolvent Extraction and Ion Exchange
Volume31
Issue number6
DOIs
Publication statusPublished - 2013

Subject classification (UKÄ)

  • Chemical Engineering

Free keywords

  • Batch impregnation
  • flow through impregnation
  • adsorption isotherm
  • ligand density
  • di-(2-ethylhexyl) phosphoric acid
  • lanthanides

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