Table 1 Elemental composition, DBE, and Ash content (wt%).

From: Chemical modification of lignin derived from spent coffee grounds for methylene blue adsorption

Sample

C

H

N

S

O

Ash

DBE

SCG

46.41

6.59

2.51

0.29

42.57

1.62

–

SAL

61.50

8.14

3.72

0.50

25.93

0.21

2.05

Ph-SAL

74.21

8.21

1.21

0.20

16.05

–

3.16

Ac-SAL

63.55

8.23

1.86

0.22

26.10

–

2.18

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