Preparation of the Na₂CO₃–Carbon Nanocomposite and Its CO₂ Capture

A Na₂CO₃–carbon nanocomposite (NaC-NC) was prepared from terephthalic acid and NaOH, and its CO₂ capture under moist conditions was examined by thermogravimetric analysis and X-ray diffraction. CO₂ capture was repeated twice. The first CO₂ capture reaction of bulk Na₂CO₃ was faster than its second, while the second capture reaction of NaC-NC was faster than its first. This may be because of the nanostructural properties of NaC-NC. The regeneration from NaHCO₃ to Na₂CO₃ of NaC-NC proceeded at a lower temperature than with the bulk NaHCO₃. Thus, compared with the bulk Na₂CO₃, we found that NaC-NC could efficiently capture CO₂, increasing the reaction rate and decreasing the regeneration temperature.