Wave number (cm−1) | ||
Untreated sorbent | Treated sorbent | Description |
3427.62 | 3421.83 | Hydrogen bonded O-H stretching |
2852.81 | 2850.88 | C-H stretching |
2507.54 | 2509.47 | -------- |
2293.44 | 2297.30 | --------- |
2058.11 | 2065.83 | --------- |
1730.21 | 1735.99 | C=O stretching in carboxyl |
1627.97 | 1624.12 | C=O stretching |
1570.11 | ----- | C-N stretching in -CO-NH- |
1419.66 | 1417.73 | O-H in plane bending (carboxyl) |
1049.31 | 1053.17 | C-OH stretching |
893.07 | 895.00 | C-H stretching |
779.27 | 781.20 | Characteristic of substituted benzene |
586.38 | 590.24 | C-Br stretching |
468.72 | 462.93 | C-I stretching |