Research Article
Spectroscopic Analysis of Heterogeneous Biocatalysts for Biodiesel Production from Expired Sunflower Cooking Oil
Table 3
Wave numbers responsible for different peaks of biodiesel (BD).
| | Wave number of BD (cm−1) | Group attributed | Vibration type | Absorption intensity |
| | 2923 | C–H | Stretch | Strong | | 2880 | C–H | Stretch | Strong | | 2853 | C–H | Stretch | Strong | | 1742 | C=O | Stretch | Very strong | | 1463 | –CH2 | In-plane bend | Medium | | 1435 | –CH3 | Asymmetric bend | Medium | | 1371 | O–CH2 | Bend | Medium | | 1245 | O–CH3 | Stretch | Strong | | 1184 | C–C | Bend | Weak | | 1169 | C–C | Bend | Strong | | 1057 | C–O | Bend | Medium | | 722 | C–H | Bend | Medium |
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