High CO2 uptake and selectivity by triptycene-derived benzimidazole-linked polymers

Area of Science:

• Materials Science
• Polymer Chemistry
• Environmental Science

Background:

• Porous organic polymers (POPs) are investigated for gas storage and separation.
• Developing POPs with high carbon dioxide (CO2) uptake and selectivity is crucial for environmental applications.

Purpose of the Study:

• To synthesize and characterize novel benzimidazole-linked polymers incorporating triptycene units.
• To evaluate the CO2 capture performance of these triptycene-based POPs.

Main Methods:

• Incorporation of triptycene moieties into the polymer backbone.
• Gas sorption analysis at 273 K and 1 bar.
• Determination of CO2/N2 and CO2/CH4 selectivities.

Main Results:

• The triptycene-containing benzimidazole-linked polymer achieved the highest CO2 uptake (5.12 mmol g(-1)) among reported POPs.
• High CO2/N2 selectivity (63) and CO2/CH4 selectivity (8.4) were observed.
• The incorporation of triptycene enhanced the material's performance.

Conclusions:

• Triptycene-based benzimidazole-linked polymers are highly effective for CO2 capture.
• These materials demonstrate significant potential for post-combustion carbon capture technologies.
• The structural design of POPs is key to optimizing gas separation performance.