Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 340, Issue -, Pages 171-178Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2017.06.056
Keywords
Rhamnolipid; Metal complexation; Rare earth element; Biosurfactant; Stability constants
Categories
Funding
- 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
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1339597] Funding Source: National Science Foundation
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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 beta), 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 beta ranging from 9.82 to 8.20. The elements Cd2+, In3+, Zn2+, Fe3+, Hg2+, and Ca2+ were moderately bound with log beta = 7.17-4.10. Finally, Sr2+, Co2+, Ni2+, UO22+, Ba2+, Mn2+, Mg2+, Rb+, and K+ were weakly bound with log beta = 3.95-0.96. Two log beta 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 beta values over those with smaller values. Preferential complexation by monorhamnolipids may constitute a green pathway for recovery of REE from alternative, non-traditional sources. (C) 2017 Elsevier B.V. All rights reserved.
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