Table 2 FTIR peak assignments and vibrational modes of rGO, Dy-MOF, Cr-MOF, Dy–Cr-MOF, and Dy–Cr-MOF/rGO.
Wavenumber (cm−1) | Assignment | Vibrational mode | Material(s) |
|---|---|---|---|
3384 | O–H stretching | Stretching of hydroxyl groups and adsorbed water | rGO |
3376 | O–H stretching | Stretching of hydroxyl groups and adsorbed water | Cr-MOF, Dy-MOF, Dy–Cr-MOF, Dy–Cr-MOF/rGO |
1616–1625 | C=O stretching | Asymmetric stretching of carboxylate groups | Cr-MOF, Dy-MOF, Dy–Cr-MOF, Dy–Cr-MOF/rGO |
1528–1542 | C–C stretching | Aromatic ring stretching | Cr-MOF, Dy-MOF, Dy–Cr-MOF, Dy–Cr-MOF/rGO |
1432 | C=C stretching | Sp2 carbon skeleton of graphene | rGO, Dy–Cr-MOF/rGO |
1367–1385 | C–O stretching | Symmetric stretching of carboxylate groups | Cr-MOF, Dy-MOF, Dy–Cr-MOF, Dy–Cr-MOF/rGO |
909 | Dy-O stretching | Metal-oxygen coordination bond (Dy3+) | Dy-MOF, Dy–Cr-MOF, Dy–Cr-MOF/rGO |
689 | Cr–O stretching | Metal–oxygen coordination bond (Cr3+) | Cr-MOF, Dy–Cr-MOF, Dy–Cr-MOF/rGO |
