NDLI: Supercritical fluid extraction of alkali metal ions using crown ethers with perfluorocarboxylic acid from aqueous solution

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Supercritical fluid extraction of alkali metal ions using crown ethers with perfluorocarboxylic acid from aqueous solution

Content Provider	Royal Society of Chemistry (RSC)
Author	Wada, Naozumi L. Smith Jr., Richard. Mochizuki, Shunsuke Inomata, Hiroshi
Copyright Year	1999
Abstract	The extraction of alkali metal ions from aqueous solution (K+, Na+ : 1.7 × 10–4 mol dm–3) with supercritical CO2 (scCO2) and crown ethers [18-crown-6 (18C6), 15-crown-5 (15C5)] as ligand was investigated at 40 °C and 8.0–18.0 MPa. The recovery for potassium ion was 1–2% with 18C6 and was independent of pressure. Remarkably, the recovery increased to 40–60% in the presence of the additive pentadecafluoro-n-octanoic acid (PFOA), which is probably because PFOA has CO2-philic fluoroalkyl chains, and easily generates counter ions for the metal–ligand complex. In the case of sodium, the recovery was found to be low even with PFOA, which may be related to the cavity size of 18C6. The 15-crown-5 ligand, having the smaller cavity size increased sodium recovery up to 20–40%. These results show that alkali metals can be extracted with scCO2 and crown ether ligands and further that the recovery of the metals can be greatly increased by adding a substance that can supply a CO2-philic counter ion.
Starting Page	51
Ending Page	52
Page Count	2
File Format	PDF
ISSN	13597337
Volume Number	36
Issue Number	2
Journal	Analytical Communications
DOI	10.1039/a808654k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Acid Supercritical carbon dioxide 18-Crown-6 Perfluorooctanoic acid Ligand Crown ether Ion 15-Crown-5 Alkali metal PFOA Potassium
Content Type	Text
Resource Type	Article
Subject	Analytical Chemistry

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