Last Update: 04/05/2026 at 2:50 PM EST
Guanidinium Fibers Capture Bicarbonate
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03/30
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Executive Summary
Guanidinium-grafted PVDF hollow fibers remove bicarbonate from water and regenerate with mild pH swings, including in saline conditions
- DFT screening found guanidinium binds bicarbonate more strongly than amine analogs in water
- Researchers synthesized a polyguanidinium polymer and covalently grafted it onto PVDF hollow fibers
- The contactor captures dissolved bicarbonate through ion exchange and regenerates with a mild pH swing
- Bench-scale tests removed 34% of bicarbonate in the first cycle and 98% after four cycles
- The fibers remained stable for at least 13 adsorption-desorption cycles in model bicarbonate solutions
- The system still removed bicarbonate under saline conditions with over 10% removal at a 10:1 NaCl to NaHCO3 ratio
Quick Facts
- What: Regenerable bicarbonate capture from aqueous solutions
- Where: Bench-scale tests in model water and saline mixtures
- Why: To support aqueous carbon removal and negative emissions applications
- Who: Researchers developing guanidinium-functionalized PVDF hollow fibers
- When: Reported in the current study
Featured Article
Researchers report guanidinium-grafted PVDF hollow fibers that capture bicarbonate from water and regenerate with mild pH swings across multiple cycles, including saline conditions.
Additional Articles
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Researchers developed guanidinium-functionalized PVDF hollow fibers that capture bicarbonate from saline water and regenerate using mild acidic pH swings.
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Researchers developed regenerable PVDF hollow fiber sorbents with guanidinium binding to capture bicarbonate from aqueous solutions, reaching 98% removal after four cycles and holding stability in saline mixtures.
A guanidinium-functionalized PVDF hollow fiber sorbent removes dissolved bicarbonate from aqueous feeds and regenerates with mild HCl pH cycling over multiple cycles.