Carbon dioxide capture using polyethylenimine-loaded mesoporous carbons.

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Developing efficient sorbents is crucial for mitigating rising atmospheric CO2 levels.
• Mesoporous carbons offer high surface area and tunable pore structures for sorbent development.
• Polyethylenimine (PEI) is a promising amine-based material for CO2 adsorption.

Purpose of the Study:

• To develop a high-efficiency sorbent for CO2 capture by loading PEI onto mesoporous carbons.
• To characterize the physicochemical properties of the developed sorbent.
• To investigate factors influencing CO2 sorption capacity and evaluate performance.

Main Methods:

• Synthesis of PEI-loaded mesoporous carbon sorbent.
• Characterization using N2 adsorption/desorption, SEM, TG, and FT-IR.
• CO2 capture performance testing under various concentrations and temperatures.
• Regeneration and stability studies.

Main Results:

• The sorbent exhibited high CO2 capture capacity across a wide concentration range (5%-80%).
• Optimal PEI loading (65 wt.%) yielded a capacity of 4.82 mmol-CO2/g-sorbent at 15% CO2/N2 and 75°C.
• Low mass-transfer resistance and high amine utilization (63%) contributed to performance.
• Moisture promoted CO2 sorption, and the sorbent showed excellent regenerability at 100°C.

Conclusions:

• PEI-loaded mesoporous carbon is a highly efficient sorbent for CO2 capture.
• The material demonstrates excellent capacity, stability, and regenerability.
• This sorbent holds significant potential for future industrial CO2 capture applications.