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Title: Supercritical fluid extraction of lanthanides with fluorinated [beta]diketones and tributyl phosphate

Abstract

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.

Authors:
;  [1]
  1. Univ. of Idaho, Moscow, ID (United States)
Publication Date:
OSTI Identifier:
7243167
Resource Type:
Journal Article
Journal Name:
Analytical Chemistry (Washington); (United States)
Additional Journal Information:
Journal Volume: 66:13; Journal ID: ISSN 0003-2700
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, 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

Citation Formats

Lin, Y, and Wai, C M. Supercritical fluid extraction of lanthanides with fluorinated [beta]diketones and tributyl phosphate. United States: N. p., 1994. Web. doi:10.1021/ac00085a008.
Lin, Y, & Wai, C M. Supercritical fluid extraction of lanthanides with fluorinated [beta]diketones and tributyl phosphate. United States. https://doi.org/10.1021/ac00085a008
Lin, Y, and Wai, C M. Fri . "Supercritical fluid extraction of lanthanides with fluorinated [beta]diketones and tributyl phosphate". United States. https://doi.org/10.1021/ac00085a008.
@article{osti_7243167,
title = {Supercritical fluid extraction of lanthanides with fluorinated [beta]diketones and tributyl phosphate},
author = {Lin, Y and Wai, C M},
abstractNote = {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.},
doi = {10.1021/ac00085a008},
url = {https://www.osti.gov/biblio/7243167}, journal = {Analytical Chemistry (Washington); (United States)},
issn = {0003-2700},
number = ,
volume = 66:13,
place = {United States},
year = {1994},
month = {7}
}