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Title: Interactions of Ionic Liquids with Uranium and its Bioreduction

Abstract

We investigated the influence of ionic liquids (ILs) 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM]{sup +}[PF{sub 6}]{sup -}, N-ethylpyridinium trifluoroacetate [EtPy]{sup +}[CF{sub 3}COO]{sup -} and N-ethylpyridinium tetrafluoroborate [Et-Py]{sup +}[BF{sub 4}]{sup -} 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 BF{sub 4}{sup -} PF{sub 6}{sup -}; and bidentate complexation with CF{sub 3}COO{sup -}. 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][BF{sub 4}] and [BMIM][PF{sub 6}] but not with [EtPy][CF{sub 3}COO].

Authors:
;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
DOE - OFFICE OF SCIENCE
OSTI Identifier:
1026773
Report Number(s):
BNL-96140-2011-CP
R&D Project: 02155/02158; YN0100000; TRN: US201121%%84
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Conference
Resource Relation:
Conference: International Conference 2011: Uranium, Mining and Hydrogeology VI; Freiberg/Saxony, Germany; 20120918 through 20110922
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ANAEROBIC CONDITIONS; CLOSTRIDIUM; MINING; MOLTEN SALTS; OPACITY; PRECIPITATION; PRODUCTION; SPECTROPHOTOMETRY; TITRATION; URANIUM

Citation Formats

Zhang, C, and Francis, A. Interactions of Ionic Liquids with Uranium and its Bioreduction. United States: N. p., 2012. Web.
Zhang, C, & Francis, A. Interactions of Ionic Liquids with Uranium and its Bioreduction. United States.
Zhang, C, and Francis, A. 2012. "Interactions of Ionic Liquids with Uranium and its Bioreduction". United States. https://www.osti.gov/servlets/purl/1026773.
@article{osti_1026773,
title = {Interactions of Ionic Liquids with Uranium and its Bioreduction},
author = {Zhang, C and Francis, A},
abstractNote = {We investigated the influence of ionic liquids (ILs) 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM]{sup +}[PF{sub 6}]{sup -}, N-ethylpyridinium trifluoroacetate [EtPy]{sup +}[CF{sub 3}COO]{sup -} and N-ethylpyridinium tetrafluoroborate [Et-Py]{sup +}[BF{sub 4}]{sup -} 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 BF{sub 4}{sup -} PF{sub 6}{sup -}; and bidentate complexation with CF{sub 3}COO{sup -}. 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][BF{sub 4}] and [BMIM][PF{sub 6}] but not with [EtPy][CF{sub 3}COO].},
doi = {},
url = {https://www.osti.gov/biblio/1026773}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Sep 18 00:00:00 EDT 2012},
month = {Tue Sep 18 00:00:00 EDT 2012}
}

Conference:
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