Synergistic extraction of uranyl ion with acylpyrazolones and dicyclohexano-18-crown-6

1987 ◽  
Vol 116 (1) ◽  
pp. 203-211 ◽  
Author(s):  
S. K. Mundra ◽  
S. A. Pai ◽  
M. S. Subramanian
Keyword(s):  
Uranyl Ion ◽  
Synergistic Extraction

Synergistic extraction of uranyl ion with β-diketones and sulphoxides

1973 ◽  
Vol 26 (1) ◽  
pp. 77 ◽  
Author(s):  
MS Subramanian ◽  
SA Pai
Keyword(s):  
Equilibrium Constant ◽  
Uranyl Ion ◽  
Synergistic Extraction ◽  
Synergistic Enhancement ◽  
Different Temperatures ◽  
Base Strength ◽  
Entropy Factor ◽  
Enthalpy And Entropy ◽  
Long Chain ◽  
Synergistic Reaction

Distribution measurements of the synergistic extraction of uranyl ion with β-diketones and sulphoxide donors indicate that the long-chain aliphatic sulphoxides are ten times more powerful as synergists than the aromatic sulphoxides. Methods of estimating the relative base strength of the donors by i.r. and N.M.R. studies of the donor hydrates are described and the results have been correlated with the equilibrium constant of the synergistic reaction. For a given sulphoxide donor, the synergistic enhancement seems to be affected by the various substituents changing the acidity of the β-diketone. From the values of enthalpy and entropy factors derived for these systems by distribution measurements at different temperatures, the greater stability of the complexes with aliphatic sulphoxide donors has been attributed to the entropy factor.

The Preparation of p(acrylonitrile-co-acrylamide) hydrogels for uranyl ion recovery from aqueous environments

2014 ◽  
Vol 1 (42) ◽  
pp. 89-89 ◽  
Author(s):  
Duygu Alpaslan ◽  
Nahit Aktas ◽  
Selehattin Yilmaz ◽  
Nurettin Sahiner
Keyword(s):  
Uranyl Ion ◽  
Aqueous Environments

Preconcentration of Uranium(VI) on Modified and Unmodified Amberlite XAD 4 Sorbent

1993 ◽  
Vol 58 (8) ◽  
pp. 1813-1820 ◽  
Author(s):  
Jan Vácha ◽  
Lumír Sommer
Keyword(s):  
Spectrophotometric Determination ◽  
Uranyl Ion ◽  
Sodium Diethyldithiocarbamate ◽  
Uranyl Ions ◽  
Methanolic Solution

The sorption of uranyl ions on columns with the macrophorus hydrophobic sorbent Amberlite XAD 4 modified with 1-(2-pyridylazo)-2-naphthol and sodium diethyldithiocarbamate was examined. Following elution of the uranyl ion with HNO3 (2 - 4 mol l-1) or of the diethyldithiocarbamate UO22+-chelate with a methanolic solution of HCl (0.1 mol l-1), uranium was determined spectrophotometrically with 4-(2-pyridylazo)resorcinol or with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol. The preconcentration of uranium on Amberlite XAD 4 type sorbents is convenient for its spectrophotometric determination in waters.

Uranyl Complexes of Alkyl-Bridged Ditopic Diaminotetraphenol Ligands and Their Use as Uranyl Ion Extractors

2013 ◽  
Vol 52 (15) ◽  
pp. 8591-8600 ◽  
Author(s):  
Antti Riisiö ◽  
Ari Väisänen ◽  
Reijo Sillanpää
Keyword(s):  
Uranyl Ion ◽  
Uranyl Complexes
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