Table 5 Parameters of infrared absorption peaks in the 3000 –2800 cm− 1 wavelength range before and after modification of coal (Peak type: Gaussian).
From: Functional group characteristics of coal treated with clean biomass surfactant via FTIR spectroscopy
Modified Coal Sample Types | Number | Peak Position (cm− 1) | Area | Relative Area (%) | Assignment |
|---|---|---|---|---|---|
Raw coal | 1 | 2828.02 | 0.25 | 5.20 | Symmetric R2CH2 |
2 | 2853.67 | 1.15 | 23.67 | Symmetric R2CH2 | |
3 | 2889.13 | 0.88 | 18.17 | CH stretching vibration | |
4 | 2919.56 | 1.79 | 36.90 | Asymmetric R2CH2 | |
5 | 2950.93 | 0.78 | 16.07 | Asymmetric RCH3 | |
Distilled water | 1 | 2834.30 | 0.37 | 7.49 | Symmetric R2CH2 |
2 | 2855.10 | 1.06 | 21.41 | Symmetric R2CH2 | |
3 | 2886.85 | 0.87 | 17.51 | CH stretching vibration | |
4 | 2915.92 | 1.72 | 34.69 | Asymmetric R2CH2 | |
5 | 2950.12 | 0.79 | 15.93 | Asymmetric RCH3 | |
6 | 2996.35 | 0.15 | 2.98 | Asymmetric RCH3 | |
Compound (1:9) | 1 | 2835.63 | 0.30 | 10.04 | Symmetric R2CH2 |
2 | 2857.10 | 0.62 | 20.65 | Symmetric R2CH2 | |
3 | 2891.46 | 0.59 | 19.68 | CH stretching vibration | |
4 | 2919.51 | 1.02 | 34.12 | Asymmetric R2CH2 | |
Compound (1:4) | 1 | 2848.92 | 1.27 | 25.43 | Symmetric R2CH2 |
2 | 2883.28 | 0.92 | 18.55 | CH stretching vibration | |
3 | 2915.95 | 1.93 | 38.78 | Asymmetric R2CH2 | |
4 | 2948.39 | 0.86 | 17.24 | Asymmetric RCH3 | |
Compound (3:7) | 1 | 2848.36 | 1.52 | 25.54 | Symmetric R2CH2 |
2 | 2882.63 | 1.11 | 18.55 | Symmetric R2CH2 | |
3 | 2915.36 | 2.31 | 38.73 | CH stretching vibration | |
4 | 2947.93 | 1.03 | 17.19 | Asymmetric R2CH2 | |
Compound (2:3) | 1 | 2832.07 | 0.28 | 7.73 | Asymmetric RCH3 |
2 | 2855.46 | 0.82 | 22.93 | Symmetric R2CH2 | |
3 | 2890.45 | 0.69 | 19.44 | Symmetric R2CH2 | |
4 | 2919.56 | 1.23 | 34.55 | CH stretching vibration | |
5 | 2951.23 | 0.55 | 15.34 | Asymmetric R2CH2 | |
Compound (1:1) | 1 | 2832.35 | 0.31 | 7.84 | Asymmetric RCH3 |
2 | 2855.55 | 0.87 | 22.27 | Symmetric R2CH2 | |
3 | 2890.04 | 0.77 | 19.70 | Symmetric R2CH2 | |
4 | 2919.05 | 1.35 | 34.52 | CH stretching vibration | |
5 | 2950.55 | 0.61 | 15.68 | Asymmetric R2CH2 | |
Compound (3:2) | 1 | 2848.88 | 0.62 | 17.86 | Asymmetric RCH3 |
2 | 2883.96 | 1.34 | 38.34 | Asymmetric RCH3 | |
3 | 2916.16 | 0.55 | 15.86 | Symmetric R2CH2 | |
4 | 2948.04 | 0.08 | 2.37 | Symmetric R2CH2 |
