Table 2.
ATR-FTIR spectroscopic data for adsorbed dyes on MMT surface at pH 7.2
| Mode of vibration | Vibrational frequency (cm−1) | ||
|---|---|---|---|
| Experimental values | Literature values | ||
| MB | RhB | ||
| νs (C=N)ring | 1607 | 1590 | 1590–160846 |
| νs (C=C)ring | 1525 | / | 1517–153747 |
| [νs (C-N) + δ(C-H)]ring | / | 1514 | 151262 |
| νs (C-N) | 1496 | / | 149643,44 |
| [νs (Ar-N)]ring | / | 1412 | 141248 |
| νs (C-S) | 1396 | / | 139045 |
| ω (CH3) | 1352 | / | 135063 |
| [νs (C=N) + νs(C-N)]ring + δ(C-H) | 1336 | 1340 | 1340–134546 |
| [νs (C-N) + νs(C-C)]ring + δ(CH2) | 1276 | / | 1268–127046 |
| ν (C-N)ring + δ(C-H) | / | 1248, 1180, | 1010–126546 |