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Updated: Jun 6, 2026

Transport Properties of Ibuprofen Encapsulated in Cyclodextrin Nanosponge Hydrogels: A Proton HR-MAS NMR Spectroscopy Study
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Sequestration of naphthenic acids from aqueous solution using β-cyclodextrin-based polyurethanes.

Mohamed H Mohamed1, Lee D Wilson, John V Headley

  • 1Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, Saskatchewan, S7N 5C9, Canada.

Physical Chemistry Chemical Physics : PCCP
|November 16, 2010
PubMed
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New β-cyclodextrin (β-CD) based polyurethanes show promise for removing naphthenic acids (NAs) from oil sands process water. These novel sorbents offer an alternative to granular activated carbon for NA remediation.

Area of Science:

  • Environmental Chemistry
  • Polymer Science
  • Materials Science

Background:

  • Oil sands process water (OSPW) contains problematic naphthenic acids (NAs) that require effective removal strategies.
  • Conventional sorbents like granular activated carbon (GAC) have limitations in NA sorption efficiency and selectivity.
  • Developing novel sorbent materials is crucial for addressing environmental challenges associated with OSPW.

Purpose of the Study:

  • To synthesize and characterize novel β-cyclodextrin (β-CD) based polyurethane sorbents for anionic naphthenic acids.
  • To evaluate the sorption performance of these copolymer sorbents from aqueous solutions simulating OSPW conditions.
  • To compare the sorption characteristics of the novel materials with a commercial granular activated carbon (GAC) standard.

Main Methods:

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  • Synthesis of β-CD-based polyurethane copolymers at varying β-CD:diisocyanate ratios.
  • Characterization of sorbent properties using sorption isotherms, electrospray ionization mass spectrometry (ESI-MS), (13)C CP-MAS NMR, IR spectroscopy, and elemental analysis.
  • Determination of monolayer sorption capacities (Q(m)) using Langmuir or Sips isotherm models.

Main Results:

  • Polyurethane sorbents synthesized with β-cyclodextrin (β-CD) demonstrated varying capacities for naphthenic acids (NAs), ranging from 0-75 mg NAs/g sorbent.
  • Granular activated carbon (GAC) exhibited a higher sorption capacity of 142 mg NAs/g sorbent.
  • The β-CD moiety within the polyurethane framework was identified as the primary sorption site for NAs, facilitating inclusion complex formation.

Conclusions:

  • β-cyclodextrin (β-CD) based polyurethanes show potential as sorbents for naphthenic acids (NAs) in simulated oil sands process water.
  • Sorption capacity is influenced by the accessible surface area and pore structure of the sorbent materials.
  • The β-CD macrocycle plays a critical role in the NA sorption mechanism, highlighting its utility in designing targeted sorbent materials.