Uranium Dioxide in Ionic Liquid with a Tri-n-butylphosphate-HNO3 Complex - Dissolution and Coordination Environment

Wai, Chien M.; Liao, Yu-Jung; Liao, Wei-sheng; Tian, Guoxin; Addleman, Raymond S.; Quach, Donna; Pasilis, Sofie P.; Pasilis, Sofie P.

doi:10.1039/C0DT01518K

Title: Uranium Dioxide in Ionic Liquid with a Tri-n-butylphosphate-HNO3 Complex - Dissolution and Coordination Environment

Journal Article · Sat May 14 00:00:00 EDT 2011 · Dalton Transactions

DOI:https://doi.org/10.1039/C0DT01518K· OSTI ID:1845876

Wai, Chien M. ^[1]; Liao, Yu-Jung ^[2]; Liao, Wei-sheng ^[2]; Tian, Guoxin ^[3];

^[4]; Quach, Donna ^[2]; Pasilis, Sofie P. ^[5]; Pasilis, Sofie P. ^[5]

UNIVERSITY OF IDAHO
University of Idaho
VISITORS
BATTELLE (PACIFIC NW LAB)
Oak Ridge National Laboratory

Uranium dioxide can be dissolved directly in an imidiazolium-based ionic liquid (IL) at room temperature with a tri-n-butylphosphate(TBP)-HNO3 complex. The dissolution process follows pseudo first-order kinetics initially. Raman spectroscopic studies show the dissolved uranyl ions are coordinated with TBP in the IL phase with a molar ratio of (UO2)2+: TBP = 1:2. The dissolved uranyl species can be effectively transferred to supercritical fluid carbon dioxide (sc-CO2) phase. No aqueous phase is formed in either the IL dissolution or the supercritical fluid extraction process. Absorption spectra of the extracted uranyl species in the sc-CO2 phase suggests the presence of an UO2(TBP)2(NO3)2 and HNO3 adduct probably of the form UO2(TBP)2(NO3)2·HNO3. The adduct dissociates in a water-dodecane trap solution during pressure reduction resulting in UO2(TBP)2(NO3)2 collected in the dodecane phase.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1845876

Report Number(s):: PNNL-SA-78548

Journal Information:: Dalton Transactions, Vol. 40, Issue 18

Country of Publication:: United States

Language:: English

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