LiNaCO3-Containing Porous Carbon Composites for CO2 capture

In this study, LiNaCO₃- and (Li-Na-K)₂CO₃-based porous carbon composites were synthesized from terephthalic acid, lithium hydroxide, sodium hydroxide, and potassium hydroxide at different calcination temperatures. These composite materials were characterized with X-Ray diffraction, scanning electron microscopy, and nitrogen adsorption and desorption. According to their CO₂ capture performance measured, LiNaC-700 °C had the largest CO₂ adsorption capacity of 66 mg CO₂ g⁻¹, while the CO₂ capture capacity of other materials doped with three metal ions was only up to 8.57 mg CO₂ g⁻¹. Additionally, the CO₂ adsorption capacity of each adsorbent was significantly higher than the N₂ adsorption capacity, showing their high CO₂ adsorption selectivity. Lithium-containing carbonate-based porous carbon materials (LiNaCO₃- and (Li-Na-K)₂CO₃-based porous carbon could effectively capture CO₂ with excellent reproducibility.