Table 1 Characteristic FTIR peaks of CK–CNF–Fe cryogel beads.
Wavenumber (cm⁻¹) | Band assignment | Functional group/bond | Interpretation |
|---|---|---|---|
3415 | Broad O–H and N–H stretch | Hydroxyl, amine | Hydrogen bonding, hydrophilicity |
2923 | C–H asymmetric stretch | Aliphatic CH₂ | Organic backbone (chitosan/cellulose) |
2854 | C–H symmetric stretch | CH₂ | Saturated aliphatic groups |
1637 | C = O stretch/H–O–H bending | Amide I/adsorbed water | Crosslinked chitosan and hydration |
1384 | C–N stretch | Amine group | Chitosan presence |
1155 | C–O–C asymmetric stretch | Glycosidic linkage | Cellulose nanofiber backbone |
1065 | C–O stretch | Alcohol/ether linkage | Polysaccharide structure |
566 | Fe–O stretch | Metal–oxygen bond | Formation of Fe nanoparticles |
