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Phosphonate functionalized magnetic mesoporous silica for rare earth element recovery from citrate assisted solid waste extracts

Journal Article · · Applied Geochemistry
 [1];  [2];  [2];  [3];  [3];  [4];  [5];  [2]
  1. Savannah River National Laboratory (SRNL), Aiken, SC (United States)
  2. Georgia Institute of Technology, Atlanta, GA (United States)
  3. Savannah River Site (SRS), Aiken, SC (United States). Savannah River Ecology Laboratory (SREL); Univ. of Georgia, Athens, GA (United States)
  4. Univ. of Iowa, Iowa City, IA (United States)
  5. Univ. of Houston, TX (United States)
The growing high demand of rare earth elements (REEs) has prompted extensive research on REE recovery from waste streams. This study reports the synthesis and evaluation of phosphonate-functionalized magnetic mesoporous silica (MMS-PP) for REE recovery from the acidic extracts of solid wastes. MMS-PP was synthesized using surfactant template and post-synthesis methods, and tested using simulated and real extraction solutions from citrate-assisted REE extracts from municipal solid waste incineration (MSWI) ash. The organic-inorganic hybrid MMS-PP was evaluated for La recovery from 50 mM simulated citrate extract, with the adsorption capacity of 13.5 mg/g compared to ∼2.5 mg/g for non-functionalized MMS. The MMS-PP material exhibited fast adsorption within 10 min, good La selectivity against competing Na+ and Ca2+, moderate selectivity against Al3+ and Fe3+, high recyclability over multiple adsorption-desorption cycles, and equivalent efficiency for La, Ce, Nd, and Y recovery. Furthermore, the MMS-PP material also demonstrated 70–95% REE recovery from real citrate extracts of MSWI ash, and the spent MMS-PP material can be regenerated and reused for multiple cycles. Functionalized mesoporous materials in combination with organic-ligand assisted extraction can potentially provide a green, effective, and tunable solid-liquid separation platform for REE recovery from complex solid waste streams.
Research Organization:
Savannah River National Laboratory (SRNL), Aiken, SC (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOD; USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Environmental Management (EM)
Grant/Contract Number:
89303321CEM000080; AC09-96SR18500; FC09-07SR22506
OSTI ID:
2999055
Journal Information:
Applied Geochemistry, Journal Name: Applied Geochemistry Vol. 162; ISSN 0883-2927
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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