Supercritical fluid extraction of lanthanides with fluorinated [beta]diketones and tributyl phosphate
- Univ. of Idaho, Moscow, ID (United States)
Trivalent lanthanide ions (La[sup 3+], Eu[sup 3+], and Lu[sup 3+]) in solid materials can be effectively extracted by methanol-modified carbon dioxide containing a suitable fluorinated [beta]-diketone (such as HFA, TTA, or FOD) at 60[degree]C and 150 atm. Addition of a small amount of water to the solid samples can significantly increase the extraction efficiency. Tributyl phosphate (TBP) shows a strong positive synergistic effect with the fluorinated [beta]-diketones for the extraction of the lanthanides in supercritical CO[sub 2] without methanol modifier. Quantitative extraction of the lanthanides (92-98%) from sand or a cellulose-based solid material can be achieved using a mixture of TBP and one of the fluorinated [beta]-diketones in neat CO[sub 2] at 60[degree]C and 150 atm. The synergistic effect depends on the structure and fluorine substitution in the [beta]-diketone. In soil matrix, TBP+HFA are more effective than TBP+TTA or TBP+FOD for lanthanide extraction in supercritical CO[sub 2]. Without fluorine substitution, as in the case of acetylacetone, the positive synergistic extraction of lanthanides with TBP is negligible. With the mixed-ligand approach, high efficiencies of lanthanide extraction from aqueous solutions by neat CO[sub 2] can also be accomplished. 14 refs., 4 tabs.
- OSTI ID:
- 7243167
- Journal Information:
- Analytical Chemistry (Washington); (United States), Vol. 66:13; ISSN 0003-2700
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
RARE EARTH COMPOUNDS
SUPERCRITICAL GAS EXTRACTION
ACETYLACETONE
AQUEOUS SOLUTIONS
CARBON DIOXIDE
CELLULOSE
COMPILED DATA
EUROPIUM IONS
KETONES
LANTHANUM IONS
LUTETIUM IONS
METHANOL
NITRIC ACID
ORGANIC FLUORINE COMPOUNDS
SAND
SYNERGISM
TBP
WATER
ALCOHOLS
BUTYL PHOSPHATES
CARBOHYDRATES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHARGED PARTICLES
CHELATING AGENTS
DATA
DISPERSIONS
ESTERS
EXTRACTION
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INFORMATION
INORGANIC ACIDS
IONS
MIXTURES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOSPHORIC ACID ESTERS
POLYSACCHARIDES
REAGENTS
SACCHARIDES
SEPARATION PROCESSES
SOLUTIONS
SOLVENT EXTRACTION
400105* - Separation Procedures
400702 - Radiochemistry & Nuclear Chemistry- Properties of Radioactive Materials