Interactions of Ionic Liquids with Uranium and Its Bioreduction

  • Chengdong Zhang
  • Arokiasamy J. Francis
Part of the Springer Geology book series (SPRINGERGEOL)


We investigated the influence of ionic liquids (ILs) 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM]+[PF6], N-ethylpyridinium trifluoroacetate [EtPy]+[CF3COO] and N-ethylpyridinium tetrafluoroborate [EtPy]+[BF4] on uranium reduction by Clostridium sp. under anaerobic conditions. Potentiometric titration, UV-vis spectrophotometry, LC-MS and EXAFS analyses showed monodentate complexation between uranyl and BF4 PF6; and bidentate complexation with CF3COO. Ionic liquids affected the growth of Clostridium sp. as evidenced by decrease in optical density, changes in pH, gas production, and the extent of U(VI) reduction and precipitation of U(IV) from solution. Reduction of U(VI) to U(IV) was observed in the presence of [EtPy][BF4] and [BMIM][PF6] but not with [EtPy][CF3COO].


Ionic Liquid Uranyl Nitrate Absorption Edge Energy Bidentate Complex Uranium Reduction 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Chengdong Zhang
    • 1
    • 2
  • Arokiasamy J. Francis
    • 1
    • 3
  1. 1.Environmental Sciences DepartmentBrookhaven National LaboratoryUptonUSA
  2. 2.College of Environmental Science and EngineeringNankai UniversityTianjinChina
  3. 3.Division of Advanced Nuclear EngineeringPohang University of Science and TechnologyPohangKorea, Republic of

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