Research Article
Effect of Ionic Liquid Surfactants on Coal Oxidation and Structure
Figure 8
Fitting spectra of IL-untreated coal at 3000∼2800 cm−1 (the five fitting spectra at 2960, 2928, 2896, 2871, and 2854 cm−1 from left to right belong to methyl asymmetrical stretching vibration, methylene asymmetrical stretching vibration, methylene stretching vibration, methyl symmetrical stretching vibration, methylene symmetrical stretching vibration, respectively).