Yeast-based microporous carbon materials for carbon dioxide capture.

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Developing efficient materials for carbon dioxide (CO2) capture is crucial for mitigating climate change.
• Microporous carbon materials offer potential for CO2 adsorption due to their high surface area and tunable pore structures.
• Yeast, an abundant and renewable biomass, can be a precursor for synthesizing carbon materials.

Purpose of the Study:

• To synthesize a hierarchical microporous carbon material from yeast using chemical activation.
• To investigate the CO2 adsorption properties of the synthesized material.
• To evaluate the effectiveness of chemical activation with potassium hydroxide for enhancing CO2 capture.

Main Methods:

• Yeast was chemically activated using potassium hydroxide (KOH) to create a hierarchical microporous carbon.
• The synthesized carbon material was characterized for its surface area, pore volume, and nitrogen content.
• CO2 adsorption experiments were conducted to determine adsorption rate and capacity, with and without the presence of N2 or H2O.

Main Results:

• The chemically activated carbon material exhibited a high Brunauer-Emmett-Teller (BET) surface area of 1348 m²/g and a pore volume of 0.67 cm³/g.
• The material contained a significant amount of nitrogen-containing groups (>5.3 wt%), resulting in basic sites.
• Enhanced CO2 adsorption rate and capacity were observed compared to directly carbonized yeast, particularly in the presence of N2 or H2O.

Conclusions:

• Chemical activation of discarded yeast with KOH is an effective method for producing high-performance microporous carbon materials.
• The resulting nitrogen-rich carbon material demonstrates superior CO2 capture capabilities.
• This approach offers a sustainable and efficient route for developing advanced materials for CO2 capture applications.