Effects of ligand chemistry and geometry on rare earth element partitioning from saline solutions to functionalized adsorbents

Clinton W. Noack, Kedar M. Perkins, Jonathan C. Callura, Newell R. Washburn, David A. Dzombak, Athanasios Karamalidis

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Rare earth elements (REE) are elements that drive the development of new technologies in many sectors, including green energy. However, the supply chain of REE is subject to a complex set of technical, environmental, and geopolitical constraints. Some of these challenges may be circumvented if REE are recovered from naturally abundant alternative sources, such as saline waters and brines. Here, we synthesized and tested aminated silica gels, functionalized with REE-reactive ligands: diethylenetriaminepentaacetic acid (DTPA), diethylenetriaminepentaacetic dianhydride (DTPADA), phosphonoacetic acid (PAA), and N,N-bisphosphono(methyl)glycine (BPG). A suite of characterization techniques and batch adsorption experiments were used to evaluate the properties of the functionalized silica adsorbents and test the REE-uptake chemistry of the adsorbents under environmentally relevant conditions. Results showed that BPG and DTPADA yielded the most REE-reactive adsorbents of those tested. Moreover, the DTPADA adsorbents demonstrated chemical and physical robustness as well as ease of regeneration. However, as in previous studies, amino-poly(carboxylic acid) adsorbents showed limited uptake at midrange pH and low-sorbate concentrations. This work highlighted the complexity of intermolecular interactions between even moderately sized reactive sites when developing high-capacity, high-selectivity adsorbents. Additional development is required to implement an REE recovery scheme using these materials; however, it is clear that BPG- and DTPADA-based adsorbents offer a highly reactive adsorbent warranting further study.

Original languageEnglish (US)
Pages (from-to)6115-6124
Number of pages10
JournalACS Sustainable Chemistry and Engineering
Volume4
Issue number11
DOIs
StatePublished - Nov 7 2016

Fingerprint

Rare earth elements
Sodium Chloride
Adsorbents
ligand
rare earth element
partitioning
Ligands
geometry
Geometry
silica
Phosphonoacetic Acid
DTPA
Brines
carboxylic acid
Acids
effect
Saline water
Silica Gel
Silica gel
Carboxylic Acids

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

Cite this

Noack, Clinton W. ; Perkins, Kedar M. ; Callura, Jonathan C. ; Washburn, Newell R. ; Dzombak, David A. ; Karamalidis, Athanasios. / Effects of ligand chemistry and geometry on rare earth element partitioning from saline solutions to functionalized adsorbents. In: ACS Sustainable Chemistry and Engineering. 2016 ; Vol. 4, No. 11. pp. 6115-6124.
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Effects of ligand chemistry and geometry on rare earth element partitioning from saline solutions to functionalized adsorbents. / Noack, Clinton W.; Perkins, Kedar M.; Callura, Jonathan C.; Washburn, Newell R.; Dzombak, David A.; Karamalidis, Athanasios.

In: ACS Sustainable Chemistry and Engineering, Vol. 4, No. 11, 07.11.2016, p. 6115-6124.

Research output: Contribution to journalArticle

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T1 - Effects of ligand chemistry and geometry on rare earth element partitioning from saline solutions to functionalized adsorbents

AU - Noack, Clinton W.

AU - Perkins, Kedar M.

AU - Callura, Jonathan C.

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AU - Karamalidis, Athanasios

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