Phosphonate functionalized magnetic mesoporous silica for rare earth element recovery from citrate assisted solid waste extracts
Journal Article
·
· Applied Geochemistry
- Savannah River National Laboratory (SRNL), Aiken, SC (United States)
- Georgia Institute of Technology, Atlanta, GA (United States)
- Savannah River Site (SRS), Aiken, SC (United States). Savannah River Ecology Laboratory (SREL); Univ. of Georgia, Athens, GA (United States)
- Univ. of Iowa, Iowa City, IA (United States)
- 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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