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    Rhamnolipid biosurfactant complexation of rare earth elements

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    Hogan_REE_Lib_Archive.pdf
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    Author
    Hogan, David E
    Curry, Joan E
    Pemberton, Jeanne E
    Maier, Raina M
    Affiliation
    Univ Arizona, Dept Soil Water & Environm Sci
    Univ Arizona, Dept Chem & Biochem
    Issue Date
    2017-10-15
    Keywords
    Biosurfactant
    Metal complexation
    Rare earth element
    Rhamnolipid
    Stability constants
    
    Metadata
    Show full item record
    Publisher
    ELSEVIER SCIENCE BV
    Citation
    Hogan, D. E., Curry, J. E., Pemberton, J. E., & Maier, R. M. (2017). Rhamnolipid biosurfactant complexation of rare earth elements. Journal of hazardous materials, 340, 171-178.
    Journal
    JOURNAL OF HAZARDOUS MATERIALS
    Rights
    © 2017 Elsevier B.V. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Rare earth elements (REE) are vital for modern technologies and considered critical materials. This study investigated monorhamnolipid biosurfactant interactions with REE as the basis for REE recovery technology. Conditional stability constants (log β), measured using a resin-based ion exchange method, are reported for 16 REE and metals. These results were combined with existing data for 10 other metals to assess comparative strength and determinants of binding. The stability constants could be divided into three groups: weakly, moderately, and strongly bound. The REE were all in the strongly bound group (UO22+, Eu3+, Nd3+, Tb3+, Dy3+, La3+, Cu2+, Al3+, Pb2+, Y3+, Pr3+, and Lu3+) with log β ranging from 9.82 to 8.20. The elements Cd2+, In3+, Zn2+, Fe3+, Hg2+, and Ca2+ were moderately bound with log β=7.17-4.10. Finally, Sr2+, Co2+, Ni2+, UO22+, Ba2+, Mn2+, Mg2+, Rb+, and K+ were weakly bound with log β=3.95-0.96. Two log β values are reported for the uranyl ion due to two distinct binding regions. A mixed metals study and associated selectivity coefficients confirmed monorhamnolipids preferentially remove metals with large log β values over those with smaller values. Preferential complexation by monorhamnolipids may constitute a green pathway for recovery of REE from alternative, non-traditional sources.
    Note
    24 month embargo; available online 23 June 2017
    ISSN
    1873-3336
    PubMed ID
    28715740
    DOI
    10.1016/j.jhazmat.2017.06.056
    Version
    Final accepted manuscript
    Sponsors
    National Science Foundation (NSF) [DGE-1143953]; NSF Collaborative Research in Chemistry Grant [CHE-0714245]; NSF Networks for Sustainable Molecular Design and Synthesis Grant [CHE-1339597]; Environmental Protection Agency
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.jhazmat.2017.06.056
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