Polymers with multiple ligand sites for metal extractions in dense-phase carbon dioxide

K. R. Powell, T. M. McCleskey, William Tumas, J. M. DeSimone

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

We have synthesized a series of CO2-soluble polymeric extractants with multiple ligand sites for CO2-based metal extractions. The CO2-soluble polymers were prepared via free-radical copolymerization of a fluorinated acrylate with a series of acrylate- or styrene-based monomers functionalized with ligand sites or ligand precursors. These polymers have high solubility in CO2; up to 30 wt % of a polymer with 15 mol % of a ligand-based monomer can be solubilized in liquid CO2 at 25°C at 140 bar. Copper and europium extractions have been performed with β-diketone- and phosphonate-functionalized polymers, respectively. Preliminary extractions with copper nitrate were carried out at ligand-to-metal ratios of 1:1 and 2.7:1, resulting in 25-37% and 59% efficiency, respectively, suggesting a ligand binding stoichiometry of 2 for efficient extraction. Europium luminescence studies demonstrate that europium is bound to the polymer along with four water molecules in the inner coordination sphere.

Original languageEnglish
Pages (from-to)1301-1305
Number of pages5
JournalIndustrial and Engineering Chemistry Research
Volume40
Issue number5
Publication statusPublished - Mar 7 2001

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Carbon Dioxide
ligand
Carbon dioxide
Polymers
polymer
carbon dioxide
Metals
Ligands
Europium
europium
metal
Copper
Monomers
copper
Organophosphonates
Styrene
free radical
stoichiometry
luminescence
Free radicals

ASJC Scopus subject areas

  • Polymers and Plastics
  • Environmental Science(all)
  • Chemical Engineering (miscellaneous)

Cite this

Polymers with multiple ligand sites for metal extractions in dense-phase carbon dioxide. / Powell, K. R.; McCleskey, T. M.; Tumas, William; DeSimone, J. M.

In: Industrial and Engineering Chemistry Research, Vol. 40, No. 5, 07.03.2001, p. 1301-1305.

Research output: Contribution to journalArticle

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