THE THERMODYNAMICS OF EXTRACTION OF SOME LANTHANIDE AND OTHER IONS BY DINONYLNAPHTHALENESULPHONIC ACID
作者:
EmmanuelO. Otu,
AlanD. Westland,
期刊:
Solvent Extraction and Ion Exchange
(Taylor Available online 1990)
卷期:
Volume 8,
issue 6
页码: 827-842
ISSN:0736-6299
年代: 1990
DOI:10.1080/07366299008918033
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The thermodynamics of extraction of some lanthanide ions and bismuth, aluminium, calcium and zinc ions from perchloric acid into solutions of dinonylnaphthalenesulphonic acid have been studied. Extraction of the trivalent ions is dominated by the entropy of complexing. Electrostriction of large complex micelles by the complexed ion is postulated in order to account for the entropy effect. In the case of divalent ions, the enthalpy of dehydration of the ion is more important. A strategy for improving the separation factors is proposed.
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