Table 6 Analysis of FTIR spectrum results of Gelidium amansii biomass before and after Pb2+ ions biosorption from aqueous solution.
Before Pb2+ ions biosorption | After Pb2+ ions biosorption | Difference | ||
|---|---|---|---|---|
Wave number (cm−1) | Annotations | Wave number (cm−1) | Annotations | |
3435 | O–H group | 3438 | O–H group | 3 |
2925 | CH2 group | 2923 | C–H stretching vibration | −2 |
2524 | S–H stretching vibration | 2525 | S–H stretching vibration | 1 |
1807 | Carbonyl group (C=O) stretching vibration | 1802 | C=C bond stretching vibration | −5 |
1624 | C=O stretching vibration of the ketone | 1624 | C=O stretching vibration of the ketone | 0 |
1471 | Vibration of the CH2 group | 1419 | Carboxyl COO− units | −52 |
1417 | Carbonyl group, C=O | 1036 | C‒O and C‒O‒C stretching vibrations | −381 |
1082 | PO2–vibrations of phospholipids | 876 | C=O stretching vibration | −206 |
875 | CO3 vibrations of calcite | 719 | C–H bend of alkene | −156 |
716 | C‒O‒C bending vibration | 546 | Vibration of P=O in PO43− | −170 |
