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Final Accepted Manuscript
Affiliation
Univ Arizona, Dept Soil Water & Environm SciUniv Arizona, Dept Chem & Biochem
Issue Date
2017-10-15
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ELSEVIER SCIENCE BVCitation
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 MATERIALSRights
© 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 2017ISSN
1873-3336PubMed ID
28715740Version
Final accepted manuscriptSponsors
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 Agencyae974a485f413a2113503eed53cd6c53
10.1016/j.jhazmat.2017.06.056