Table 1 Assignments of FTIR peaks in lignin samples [23, 24]
Wavenumber/cm−1 | Assignments |
|---|---|
1616, 1512, 1423 | Aromatic skeletal vibrations |
1708 | Non-conjugated carbonyl groups |
1649 | Conjugated carbonyl groups |
1272 | The C–O stretching of G type lignin |
1043 | S=O stretching vibration |
834 | p-hydroxyphenyl units (H unit) |
536 | C–S stretching vibration |