Metal Ion Extraction with Bipyridine Derivatives as Chelating Ligands in Supercritical Carbon Dioxide |
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| Authors: | Hai‐Jian Yang Hakwon Kim Cun‐Yue Guo |
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| Affiliation: | 1. Department of Applied Chemistry and Industrial Liaison Research Institute, Kyung Hee University, Republic of Korea.;2. Beijing National Laboratory for Molecular Sciences, Chinese Academy of Sciences, Beijing, P.R. China. |
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| Abstract: | Three fluorinated bipyridine ligands have been designed and synthesized as chelating agents for the extraction of metal ions in supercritical CO2 (sc‐CO2). The ligand solubilities in sc‐CO2 were investigated at different temperatures and pressures, and the measured data have been correlated using a semiempirical model. The calculated results showed satisfactory agreement with the experimental data. Based on these data, metal ion extraction with the three compounds as chelating agents in sc‐CO2 was performed from spiked filter paper, whereby ligand 1 showed the highest extraction efficiency, especially for Ni2+ and Cu2+. The extraction constants, Kex, of the three chelating ligands were seen to increase with increasing extraction efficiency for the same metal ion in the same extraction system. |
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| Keywords: | Bipyridine derivatives Extraction constant Metal ions extraction Solubility Supercritical CO2 |
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