Wavenumber (cm−1) | Assignments | References | ||
AC | NA | RC | ||
3333.52 | 3335.12 | 3332.40 | Elongation of -OH from hemicelluloses and O-H from cellulose | [24] [28] [30] |
2916.83 | 2929.15 | 2996.52 | Stretching of C-H and CH2 of cellulose | [13] [22] [23] |
1733.03 | 1729.24 | 1730.67 | Symmetric C=O prolongation of hemicelluloses and pectins | [12] [22] [27] [31] |
1632.25 | 1631.21 | 1634.50 | Shearing of the -OH bond in open water | [22] [23] |
1539.25 | 1508.46 | 1512.81 | Symmetrical stretching of C=C of lignin | [24] [31] |
1454.62 | 1454.62 | 1454.62 | Bending of CH2 in cellulose and asymmetric deformation of CH3 in cellulose. | [13] |
1030.40 | 1032.18 | 1031.27 | Elongation vibration of the -OH and C=O bonds of cellulose. | [24] [28] |
893.74 | 893.74 | 893.74 | Symmetrical stretching of the C-H and O-H bonds of cellulose. | [13] |