TY - JOUR
T1 - A comparative study of ionic liquids and a conventional organic solvent on the extraction of rare-earth ions with TOPO
AU - Yang, Fan
AU - Kubota, Fukiko
AU - Kamiya, Noriho
AU - Goto, Masahiro
PY - 2013
Y1 - 2013
N2 - A comparative study of ionic liquids (ILs) and a conventional organic solvent on the extraction of rare-earth ions from a nitrate-contained solution with TOPO has been investigated. A slope analysis was carried out to determine the extraction mechanism, and it was found that more TOPO molecules and the ionic constituents of the ILs have taken part in the extraction reaction in the ILs-based TOPO extraction systems. The numbers of TOPO molecules coordinated to the metal ion in the extracted complexes were 6 and 4 in the [C4mim] and [C8mim][Tf2N] systems, although 3 TOPO molecules were needed in the n-dodecane system. Higher extraction efficiency was obtained in the extraction system in which the higher coordinating number of TOPO was shown. The extraction ability of [C8mim][Tf2N]-based TOPO depends significantly on the ionic constituents of the ILs in the extracting phase, but depends only slightly on the anionic nitrate ion from the aqueous phase, and [C4mim][Tf2N]-based TOPO is not dependent on the nitrate ion.
AB - A comparative study of ionic liquids (ILs) and a conventional organic solvent on the extraction of rare-earth ions from a nitrate-contained solution with TOPO has been investigated. A slope analysis was carried out to determine the extraction mechanism, and it was found that more TOPO molecules and the ionic constituents of the ILs have taken part in the extraction reaction in the ILs-based TOPO extraction systems. The numbers of TOPO molecules coordinated to the metal ion in the extracted complexes were 6 and 4 in the [C4mim] and [C8mim][Tf2N] systems, although 3 TOPO molecules were needed in the n-dodecane system. Higher extraction efficiency was obtained in the extraction system in which the higher coordinating number of TOPO was shown. The extraction ability of [C8mim][Tf2N]-based TOPO depends significantly on the ionic constituents of the ILs in the extracting phase, but depends only slightly on the anionic nitrate ion from the aqueous phase, and [C4mim][Tf2N]-based TOPO is not dependent on the nitrate ion.
UR - http://www.scopus.com/inward/record.url?scp=84879221066&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84879221066&partnerID=8YFLogxK
U2 - 10.15261/serdj.20.225
DO - 10.15261/serdj.20.225
M3 - Article
AN - SCOPUS:84879221066
SN - 1341-7215
VL - 20
SP - 225
EP - 232
JO - Solvent Extraction Research and Development
JF - Solvent Extraction Research and Development
ER -