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Related Concept Videos

Carbon-dioxide Fixation01:28

Carbon-dioxide Fixation

Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Covalent Organic Frameworks with Deep Eutectic Linkages for Low-Concentration Carbon Capture.

He Li1, Xiansong Shi1, Wen-Hua Li1

  • 1Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585, Singapore.

Journal of the American Chemical Society
|May 22, 2026
PubMed
Summary

Researchers developed a new adsorbent, Im-TBD, for cost-effective carbon capture. This material offers high CO2 selectivity, low regeneration temperatures, and excellent oxidation resistance, outperforming traditional amine-based methods.

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Microfluidic-based Synthesis of Covalent Organic Frameworks (COFs): A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Microfluidic-based Synthesis of Covalent Organic Frameworks (COFs): A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Published on: July 10, 2017

Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Amine-based adsorbents are effective for CO2 capture but degrade in air, increasing costs.
  • Developing adsorbents with low regeneration temperatures and high oxidation resistance is crucial for efficient carbon capture.

Purpose of the Study:

  • To create a novel adsorbent with enhanced CO2 capture capabilities, low regeneration temperature, and superior oxidation resistance.
  • To investigate the conversion of imidazole-based covalent organic frameworks (COFs) into a deep eutectic linkage (DEL) structure for improved CO2 chelation.

Main Methods:

  • Synthesized imidazole-based COFs embedded with 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) to form DEL COFs (Im-TBD).
  • Characterized Im-TBD using X-ray photoelectron spectroscopy (XPS), zeta potential, and solid-state nuclear magnetic resonance (ssNMR).
  • Evaluated CO2/N2 selectivity under direct air capture (DAC) and natural gas combined-cycle (NGCC) conditions, assessed regeneration stability, and performed energy analysis.

Main Results:

  • Im-TBD demonstrated high CO2 affinity and selectivity (1711 for DAC, 230 for NGCC).
  • The adsorbent regenerated effectively at 60 °C in air and maintained performance over 20 cycles.
  • Regeneration heat requirement was reduced by 72-96% compared to water-containing systems.

Conclusions:

  • The developed Im-TBD adsorbent offers a promising alternative to amine-based technologies for cost-effective carbon capture.
  • This strategy provides a foundation for next-generation nonamine adsorbents with enhanced stability and efficiency.
  • The deep eutectic linkage approach in COFs is effective for CO2 chelation and low-temperature regeneration.