ATR-FTIR Spectroscopic Study of CO ₂ Sorption Depending on the Ionogel Solid Matrix Type

Ionogels representing gels based on ionic liquids (ILs) are of great interest as adsorbent materials believed to have great potential for CO₂ capture. However, there is limited information regarding the influence of the network matrix peculiarities on CO₂ sorption by ionogels. Both in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) and FTIR imaging spectroscopy have been applied to investigate the influence of the chemical nature and the structure of the ionogel support matrix on the spectral characteristics of sorbed CO₂. A range of ionogels has been prepared, and the distribution of the IL on the matrix surface has been considered. An analysis of the sorbed CO₂ spectra is given, with special attention paid to side processes occurring during sorption. It has been shown that textural properties of the support matrix have a greater impact than the chemical nature in terms of CO₂ sorption.