Carbon Dioxide Capture from Ambient Air Using Amine-Grafted Mesoporous Adsorbents

Figure 5

FTIR (DRIFT) spectra in the region 1300–1900 cm⁻¹ of the TRI adsorbent material as a function of long-time outdoor exposure: (a) fresh, (b) outdoor 202 h, and (c) outdoor 514 h. Further experimental details listed in Table 1. The band at ~1660 cm⁻¹ is assigned to urea groups and the band at ~1600 cm⁻¹ to NH₂.