Research Article
In Situ Disassembling Behavior of Composite Hydrogels for the Efficient Removal of Crystal Violet Dye from Aqueous Solution
Table 4
Changes observed at FTIR frequencies observed with free hydrogels and ash composites.
| | Type of frequency | Free hydrogels (cm−1) | Black ash composite
hydrogels (cm−1) | White ash composite
hydrogels (cm−1) |
| | N–H, O–H bonds [15–17] | 3431 | 3424 (intensity increases) | 3429 | | C=O stretching vibration in amide groups (amide-I) [15–18] | 1638 | 1651 | 1643 | | Bending of N–H bond (amide-II) | 1558 | 1555 | 1556 | | C–N bond (amide-III) | 1448 | 1452 | 1454 | | Symmetric and asymmetric stretching of –SO2 | 1220 and 1038 | 1222 and 1039 | 1223 and 1037 | | C=O bond of Carboxyl group [19–23] | 1723 | 1728 | Do not appear | | C–O–Si stretching | Do not appear | Do not appear | 1109 |
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