Research Article
Removal of Fluorescein Dye from Aqueous Solutions Using Natural and Chemically Treated Pine Sawdust
Table 1
FT-IR peaks of the functional groups in NPS and SPS.
| NPS, wavenumber (cm−1) | SPS, wavenumber (cm−1) | Frequency ranges (cm−1) | Groups (bonds) | Functional groups |
| 3423 | 3415 | 3500–3200 | O–H stretching | Phenolic or alcoholic | 2915 | 2900 | <3000 | Sp3 C-H stretching | Alkane groups | 1700 | 1690 | 1850–1600 | C=O | Carbonyl group | 1650 | 1650 | 1750–1600 | C=C | Alkene groups | 1450 | 1480 | 1500–1400 | Sp2 C-H bending | Alkene groups | 1340 | 1340 | <1400 | Sp3 C-H bending | Alkane groups | 1250 | 1240 | 1300–1100 | Sp2 C-O | Ester | 1050 | 1050 | 1100–1000 | Sp3 C–O | Alcohol | 530 | 545 | 550–450 | Sp2 C–H bending | Aromatic |
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