Adsorption kinetics, thermodynamics, and isotherm studies for functionalized lanthanide-chelating resins

Jonathan C. Callura, Kedar M. Perkins, John P. Baltrus, Newell R. Washburn, David A. Dzombak, Athanasios Karamalidis

Research output: Contribution to journalArticle

Abstract

Conventional ion exchange resins are widely utilized to remove metals from aqueous solutions, but their limited selectivity precludes dilute ion extraction. This research investigated the adsorption performance of ligand-functionalized resins towards rare earth elements (REE). Functionalized resin particles were synthesized by grafting different ligands (diethylenetriaminepentaacetic dianhydride (DTPADA), phosphonoacetic acid (PAA), or N,N-bis(phosphonomethyl)glycine (BPG)) onto pre-aminated polymeric adsorbents (diameter ∼ 0.6 mm). Lanthanide uptake trends were evaluated for the functionalized resins using batch adsorption experiments with a mixture of three REEs (Nd, Gd, and Ho at 0.1–1000 mg/L each). Resin physical-chemical properties were determined by measuring their surface area, ligand concentrations, and acidity constants. The aminated supports contained 4.0 mmol/g primary amines, and ligand densities for the functionalized resins were 0.33 mmol/g (PAA), 0.22 mmol/g (BPG), and 0.42 mmol/g (DTPADA). Kinetic studies revealed that the functionalized resins followed pseudo-second order binding kinetics with rates limited by intraparticle diffusion. Capacity estimates for total REE adsorption based on Langmuir qMax were 0.12 mg/g (amine; ≈ 0.77 µmol/g), 5.0 mg/g (PAA; ≈ 32.16 µmol/g), 3.0 mg/g (BPG; ≈ 19.30 µmol/g), and 2.9 mg/g (DTPADA; ≈ 18.65 µmol/g). Attaching ligands to the aminated resins greatly improved their REE binding strength and adsorption efficiency.

Original languageEnglish (US)
Pages (from-to)465-477
Number of pages13
JournalJournal of Colloid And Interface Science
Volume557
DOIs
StatePublished - Dec 1 2019

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Lanthanoid Series Elements
Chelation
Rare earth elements
Isotherms
Resins
Thermodynamics
Phosphonoacetic Acid
Adsorption
Kinetics
Ligands
Amines
Acids
Ion Exchange Resins
Ion exchange resins
Acidity
Adsorbents
Chemical properties
Amino acids
Metals
Ions

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Cite this

Callura, Jonathan C. ; Perkins, Kedar M. ; Baltrus, John P. ; Washburn, Newell R. ; Dzombak, David A. ; Karamalidis, Athanasios. / Adsorption kinetics, thermodynamics, and isotherm studies for functionalized lanthanide-chelating resins. In: Journal of Colloid And Interface Science. 2019 ; Vol. 557. pp. 465-477.
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abstract = "Conventional ion exchange resins are widely utilized to remove metals from aqueous solutions, but their limited selectivity precludes dilute ion extraction. This research investigated the adsorption performance of ligand-functionalized resins towards rare earth elements (REE). Functionalized resin particles were synthesized by grafting different ligands (diethylenetriaminepentaacetic dianhydride (DTPADA), phosphonoacetic acid (PAA), or N,N-bis(phosphonomethyl)glycine (BPG)) onto pre-aminated polymeric adsorbents (diameter ∼ 0.6 mm). Lanthanide uptake trends were evaluated for the functionalized resins using batch adsorption experiments with a mixture of three REEs (Nd, Gd, and Ho at 0.1–1000 mg/L each). Resin physical-chemical properties were determined by measuring their surface area, ligand concentrations, and acidity constants. The aminated supports contained 4.0 mmol/g primary amines, and ligand densities for the functionalized resins were 0.33 mmol/g (PAA), 0.22 mmol/g (BPG), and 0.42 mmol/g (DTPADA). Kinetic studies revealed that the functionalized resins followed pseudo-second order binding kinetics with rates limited by intraparticle diffusion. Capacity estimates for total REE adsorption based on Langmuir qMax were 0.12 mg/g (amine; ≈ 0.77 µmol/g), 5.0 mg/g (PAA; ≈ 32.16 µmol/g), 3.0 mg/g (BPG; ≈ 19.30 µmol/g), and 2.9 mg/g (DTPADA; ≈ 18.65 µmol/g). Attaching ligands to the aminated resins greatly improved their REE binding strength and adsorption efficiency.",
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Adsorption kinetics, thermodynamics, and isotherm studies for functionalized lanthanide-chelating resins. / Callura, Jonathan C.; Perkins, Kedar M.; Baltrus, John P.; Washburn, Newell R.; Dzombak, David A.; Karamalidis, Athanasios.

In: Journal of Colloid And Interface Science, Vol. 557, 01.12.2019, p. 465-477.

Research output: Contribution to journalArticle

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T1 - Adsorption kinetics, thermodynamics, and isotherm studies for functionalized lanthanide-chelating resins

AU - Callura, Jonathan C.

AU - Perkins, Kedar M.

AU - Baltrus, John P.

AU - Washburn, Newell R.

AU - Dzombak, David A.

AU - Karamalidis, Athanasios

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