Investigation on the extraction of strontium ions from aqueous phase using crown ether-ionic liquid systems |
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Authors: | Chao Xu XingHai Shen QingDe Chen HongCheng Gao |
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Institution: | (1) IPHC-DRS/CHNU, 23 rue du Loess, 67037 Strasbourg Cedex 2, France;(2) IPN Lyon, 4 rue E. Fermi, 69622 Villeurbanne Cedex, France |
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Abstract: | The extraction of strontium ions using DCH18C6 as the extractant and various ionic liquids (ILs) as solvents has been investigated.
The distribution ratio of Sr2+ can reach as high as 103 under certain conditions, much larger than that in DCH18C6/n-octanol system. The extraction capacity depends greatly on the structure of ionic liquids. In IIs-based extraction systems,
the extraction efficiency of strontium ions is reduced by increasing the concentration of nitric acid and can also be influenced
directly by the presence of Na+ and K+ in the aqueous phase. It is confirmed that the extraction proceeds mainly via a cation-exchange mechanism. |
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