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 language | English |
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Pages (from-to) | 668-682 |
Journal | Solvent Extraction and Ion Exchange |
Volume | 31 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2013 |
Subject classification (UKÄ)
- Chemical Engineering
Free keywords
- Batch impregnation
- flow through impregnation
- adsorption isotherm
- ligand density
- di-(2-ethylhexyl) phosphoric acid
- lanthanides