Thermodynamics of the solvent extraction of thorium and europium nitrates by neutral phosphorylated ligands

被引：0
作者：
M. R. Yaftian
R. Taheri
A. A. Zamani
D. Matt
机构：
[1] Zanjan University,Department of Chemistry, Faculty of Sciences
[2] Université Louis Pasteur,Laboratoire de Chimie Inorganique Moléculaire, UMR 7513 CNRS
来源：
Journal of Radioanalytical and Nuclear Chemistry | 2004年 / 262卷
关键词：
Thorium; Phosphine Oxide; TPPO; Nitrate Medium; Triphenylphosphine Oxide;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Solvent extraction of tetravalent thorium and trivalent europium ions from nitrate media into dichloromethane solution of triphenylphosphine oxide (TPPO) has been studied. The extractant was shown to be more efficient for europium than for thorium. A conventional log-log analysis reveals that the extraction of both metal nitrates takes place via the formation of the species with 1 : 2 metal to ligand ratio. Thermodynamic parameters i.e., ΔG°, ΔH° and ΔS° of the extraction process using 1,2-dichloroethane as diluent have been calculated based on the influence of the temperature on extraction equilibria in the range 293-313 K. While the extraction of europium is controlled by enthalpy changes, the extraction of thorium is an endothermic process and is driven by entropy changes. A comparison of these data with those obtained for the extraction of europium and thorium nitrates by two other related phosphorylated ligands, tri-n-octylphosphine oxide (TOPO) and diphenyl-N,N-dimethylcarbamoylmethylphosphine oxide (DФDMCMPO), indicates that DФDMCMPO coordinates presumably as a chelating ligand.
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页码：455 / 459
页数：4
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