Tailored Carbon Nanocomposites for Efficient CO₂ Capture.

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Carbon dioxide (CO2) capture via adsorption on solid materials offers a low-energy, implementable solution.
• Developing efficient adsorbents is crucial for advancing carbon capture technologies.

Purpose of the Study:

• To synthesize and characterize nanocarbon and reduced graphene oxide composites for CO2 capture.
• To evaluate the CO2 adsorption capacity, heats of adsorption, and selectivity of the synthesized materials.

Main Methods:

• Materials synthesized using graphite, L-ascorbic acid (LAA), and glycine as precursors.
• Characterization via XRD, N2 adsorption, FTIR, Raman, XPS, SEM, and TEM.
• CO2 adsorption performance evaluated at 273 K and 100 kPa.

Main Results:

• Hierarchical porous structures were observed in NC-LAA, NC/RGO-LAA, and NC/RGO-Gly.
• NC/RGO-LAA exhibited the highest CO2 adsorption capacity (3.5 mmol/g) at 273 K and 100 kPa.
• Glycine-derived materials showed adsorption linked to nitrogen functional groups; NC/RGO-LAA demonstrated synergistic physical and chemisorption.

Conclusions:

• The synthesized nanocarbon and reduced graphene oxide composites show promise for CO2 capture.
• The NC/RGO-LAA material's superior performance is attributed to the synergy between carbon dots and RGO, optimizing surface functionalization and porosity.
• These materials offer a viable pathway for developing advanced CO2 adsorbents.