Novel extractants having two functional phosphonic groups in the molecular structure have been synthesized. The solvent extraction of six lanthanide group metals in nitric acid media has been investigated with a view to developing an extraction model suited to transuranium elements in a liquid-liquid extraction system. Results have shown that the novel extractants possess superior extraction characteristics and selectivity for lanthanides as compared to ordinary mono-phosphonic acid extractants. The enhanced extraction properties of the newly synthesized extractants are attributed to the presence in the molecular structure of a shorter alkyl chains linking the two constituted functional groups. In addition, the thermodynamic properties, entropy and enthalpy, have been evaluated from temperature dependent extraction profiles to elucidate the extraction mechanism.
|Number of pages||11|
|Journal||Solvent Extraction Research and Development|
|Publication status||Published - Dec 1 1997|
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)