An Ultramicroporous Graphene-Based 3D Structure Derived from Cellulose-Based Biomass for High-Performance CO₂ Capture

Area of Science:

• Materials Science
• Environmental Science
• Chemical Engineering

Background:

• Powered activated carbon limitations include inconsistent particle sizes and porosities, reducing adsorption efficiency.
• Developing advanced materials for gas separation is crucial for environmental applications.

Purpose of the Study:

• To develop a practical and eco-friendly method for creating 3D graphene nanostructures from wood biomass.
• To evaluate the gas capture and selectivity characteristics of the synthesized material for CO2, CH4, and N2.

Main Methods:

• Wood-based biomass underwent delignification, carbonization, and KOH vapor activation.
• Textural and chemical analyses were performed to characterize the resulting nanostructure.
• Gas capture capacity and selectivity for binary mixtures were evaluated.

Main Results:

• A monolithic 3D graphene network with uniform ultramicropores (3.5-11 Å) was successfully synthesized.
• The 'Act. 1000' sample achieved a high surface area (1480 m²/g) and pore volume (0.581 cm³/g).
• The material demonstrated a high CO2 capture capacity (6.934 mol/kg at 110 kPa) and favorable selectivity for CO2/N2 and CO2/CH4 mixtures.

Conclusions:

• The biomass-derived 3D graphene structure offers a promising alternative to traditional adsorbents.
• This material shows potential for use as a monolithic adsorbent in gas separation applications.