Table 6 Parameters of the peak separation of the infrared absorption peaks in the 1800 –1000 cm− 1 band of the coal before and after modification (Peak type: Gaussian).

From: Functional group characteristics of coal treated with clean biomass surfactant via FTIR spectroscopy

Sample Types

Number

Peak Position

(cm− 1)

Area

Relative Area

(%)

Assignment

Raw coal

1

1024.1

26.03

44.07

C-O-C stretching vibration

2

1098.57 ~ 1189.53

13.02

23.05

C-O vibration of alcohols, phenols and ethers

3

1402.12 ~ 1456.08

6.24

11.04

Asymmetric deformation vibration of CH3-, CH2-

4

1583.12 ~ 1628.48

11.20

19.83

C = C double bond vibration of aromatic hydrocarbons

Distilled water

1

1023.14

20.48

24.33

C-O-C stretching vibration

2

1101.43 ~ 1183.13

15.65

18.60

C-O vibration of alcohols, phenols and ethers

3

1251.15 ~ 1319.09

11.74

13.95

C-O vibration of aryl ethers

4

1390.07 ~ 1445.44

16.82

19.99

Asymmetric deformation vibration of CH3-, CH2-

5

1515.87 to 1630.33

19.46

19.57

C = C double bond vibration of aromatic hydrocarbons

Compound (1:9)

1

1023.62

6.25

14.77

C-O-C stretching vibration

2

1099.35 ~ 1171.95

7.66

18.10

C-O vibration of alcohols, phenols and ethers

3

1229.77 ~ 1334.47

7.93

18.73

C-O vibration of aryl ethers

4

1399.13 ~ 1529.04

12.65

29.88

Asymmetric deformation vibration of CH3-, CH2-

5

1603.25 to 1660.74

7.84

18.52

C = C double bond vibration of aromatic hydrocarbons

Compound (1:4)

1

1024.14

11.04

18.19

C-O-C stretching vibration

2

1099.01 ~ 1170.62

12.15

20.01

C-O vibration of alcohols, phenols and ethers

3

1225.11 ~ 1326.30

10.32

17.00

C-O vibration of aryl ethers

4

1396.03 ~ 1531.72

16.28

26.83

Asymmetric deformation vibration of CH3-, CH2-

5

1594.62 ~ 1643.69

10.90

17.97

C = C double bond vibration of aromatic hydrocarbons

Compound (3:7)

1

1024.63

12.58

17.14

C-O-C stretching vibration

2

1096.55 ~ 1171.12

15.39

20.97

C-O vibration of alcohols, phenols and ethers

3

1228.02 ~ 1328.82

14.19

19.33

C-O vibration of aryl ethers

4

1396.15 ~ 1514.70

19.81

26.99

Asymmetric deformation vibration of CH3-, CH2-

5

1596.55 ~ 1654.21

11.43

15.57

C = C double bond vibration of aromatic hydrocarbons

Compound (2:3)

1

1021.27

8.38

16.19

C-O-C stretching vibration

2

1097.39 ~ 1166.37

9.45

18.26

C-O vibration of alcohols, phenols and ethers

3

1217.44 ~ 1325.69

9.80

18.94

C-O vibration of aryl ethers

4

1397.92 ~ 1532.44

14.49

27.99

Asymmetric deformation vibration of CH3-, CH2-

5

1591.01 ~ 1638.48

9.64

18.63

C = C double bond vibration of aromatic hydrocarbons

Compound (1:1)

1

1023.78

9.67

15.77

C-O-C stretching vibration

2

1098.50 ~ 1167.24

11.41

18.61

C-O vibration of alcohols, phenols and ethers

3

1221.18 ~ 1329.13

11.75

19.16

C-O vibration of aryl ethers

4

1397.65 ~ 1524.43

17.99

29.35

Asymmetric deformation vibration of CH3-, CH2-

5

1590.11 ~ 1639.31

10.50

17.12

C = C double bond vibration of aromatic hydrocarbons

Compound (3:2)

1

1024.38

7.98

16.12

C-O-C stretching vibration

2

1098.91 ~ 1169.06

8.88

17.94

C-O vibration of alcohols, phenols and ethers

3

1222.66 ~ 1325.26

8.06

16.27

C-O vibration of aryl ethers

4

1397.74 ~ 1535.66

14.14

28.55

Asymmetric deformation vibration of CH3-, CH2-

5

1595.81 ~ 1644.12

10.47

21.13

C = C double bond vibration of aromatic hydrocarbons

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