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http://dx.doi.org/10.5012/bkcs.2005.26.3.423

The Synergistic Effect of Organophosphorus and Dithiocarbamate Ligands on Metal Extraction in Supercritical CO2  

Koh, Moon-Sung (Green Nuclear Research Laboratory, EIRC, Kyung Hee University)
Park, Kwang-Heon (Green Nuclear Research Laboratory, EIRC, Kyung Hee University)
Yang, Doo-Hyun (Green Nuclear Research Laboratory, EIRC, Kyung Hee University)
Kim, Hak-Won (Green Nuclear Research Laboratory, EIRC, Kyung Hee University)
Kim, Hong-Doo (Green Nuclear Research Laboratory, EIRC, Kyung Hee University)
Publication Information
Bulletin of the Korean Chemical Society / v.26, no.3, 2005 , pp. 423-427 More about this Journal
Abstract
The bis(2,4,4-trimethylpentyl)phosphinic acid (Cyanex-272) and sodium diethyl- dithiocarbamate (NaDDC) ligands were used to extract of metal ions ($Cd^{2+},\;Co^{2+},\;Cu^{2+},\;Pb^{2+},\;Zn^{2+}$) in supercritical $CO_2$. Experiments showed a strong synergistic effect and better extraction efficiency if the two ligands were used together. In-situ UV-visible observation indicates that NaDDC in the water/supercritical $CO_2$ started to decompose slowly. The synergistic effect seems to come from the deprotonation of the organophosphorus ligand by amines from the decomposed NaDDC. The enhancing role of amines was confirmed using the mixture of Cyanex-272 and diethylamine(DEA) in the metal extraction.
Keywords
Supercritical; Carbon dioxide; Metal extraction; Synergistic effect; Amine;
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