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Updated: Sep 5, 2025
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Author Spotlight: Standardizing the Development of Amine-Based Silica Composites as CO2 Adsorbents for Direct Air Capture
Published on: September 29, 2023
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Covalent Organic Frameworks for Carbon Dioxide Capture from Air
Hao Lyu1, Haozhe Li1, Nikita Hanikel1
1Department of Chemistry and Kavli Energy Nanoscience Institute, University of California, Berkeley, Berkeley, California 94720, United States.
Journal of the American Chemical Society
|July 5, 2022
Summary
Researchers developed a new method to incorporate amine species into covalent organic frameworks (COFs). This significantly boosts carbon dioxide (CO2) capture, especially from dilute sources like air.
Area of Science:
- Materials Science
- Chemical Engineering
- Environmental Science
Background:
- Covalent organic frameworks (COFs) are porous materials with tunable properties.
- Developing efficient CO2 capture materials is crucial for mitigating climate change.
- Incorporating reactive functional groups into COFs can enhance their gas adsorption capabilities.
Purpose of the Study:
- To report the first covalent incorporation of reactive aliphatic amine species into COFs.
- To develop a new synthetic strategy for creating high-affinity CO2 chemisorbents.
- To investigate the CO2 uptake capacity of modified COFs under varying humidity conditions.
Main Methods:
- Crystallization of an imine-linked COF (COF-609-Im).
- Conversion of imine linkages to tetrahydroquinoline via aza-Diels-Alder cycloaddition.
- Covalent incorporation of tris(3-aminopropyl)amine into the framework.
- Characterization using isotope-labeled Fourier transform infrared spectroscopy and solid-state nuclear magnetic resonance spectroscopy.
Main Results:
- The modified COF-609 demonstrated a 1360-fold increase in CO2 uptake compared to the pristine framework.
- An additional 29% enhancement in CO2 uptake was observed in the presence of humidity.
- The framework conversion chemistry and enhanced CO2 uptake were confirmed experimentally.
Conclusions:
- A novel synthetic strategy for creating amine-functionalized COFs was established.
- The resulting COF-609 exhibits exceptional CO2 capture performance, particularly from dilute sources.
- This work provides a promising pathway for developing advanced chemisorbents for carbon capture applications.
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