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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Aqueous Carbon Capture Using Guanidinium-Functionalized Hollow Fiber Sorbent Contactors.

Mary K Danielson1,2, Nicholas Gregorich1, Mary H Irwin1,3

  • 1Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.

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|May 1, 2026
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This study introduces a novel method for capturing carbon dioxide from water using functionalized hollow fiber membranes. The guanidinium-grafted polyvinylidene fluoride (PVDF) system shows high efficiency and stability for aqueous carbon removal, offering a promising negative emissions technology.

Keywords:
carbon capturefiber contactorsion exchangepH swingpolymer sorbents

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemical Engineering

Background:

  • Negative emissions technologies are crucial for mitigating climate change.
  • Carbon removal from aqueous sources is an underexplored but vital area.
  • Developing efficient materials for aqueous carbon capture presents significant challenges.

Purpose of the Study:

  • To explore the potential of functionalized polyvinylidene fluoride (PVDF) hollow fiber contactors for aqueous carbon removal.
  • To identify and utilize guanidinium as a promising sorbent motif for bicarbonate ion binding.
  • To develop and test a novel polymer-sorbent-grafted hollow fiber system for efficient carbon capture from water.

Main Methods:

  • Computational screening of sorbent materials to identify guanidinium for bicarbonate binding.
  • Synthesis of a guanidinium polymer and its covalent grafting onto PVDF hollow fibers.
  • Testing the performance and stability of the functionalized hollow fiber contactors in aqueous solutions.

Main Results:

  • The prototype achieved an initial 34% bicarbonate removal, increasing to 98% after four cycles.
  • The functionalized fibers demonstrated stability over 13 adsorption/desorption cycles with mild pH swing regeneration.
  • The system maintained selective performance in the presence of chloride ions, with carbon removal above 10% at high NaCl/NaHCO3 ratios.

Conclusions:

  • Sorbent-based aqueous carbon removal using functionalized PVDF hollow fibers is feasible.
  • The developed system shows potential as a promising approach for negative emissions.
  • Further development of this technology could significantly contribute to climate change mitigation efforts.