Table 12.

The FT-IR spectra characteristics of the surface of Noug stalk activated carbon.

Wave number (cm−1)	Bond	Functional group
3600–3000	Stretching O–H, N–H	Hydroxyl, carboxylic acid
3000–2800	Stretching C–H	Aliphatic, olefinic, and aromatic hydrocarbons
1770–1650	Stretching C=O	Carbonyl
1700–1600	Stretching C=C	Olefin structures
1480–1420	Bending C–H	Aliphatic structure
1430–1360	Bending O–H and C–H	Hydroxyl, carboxylic acid, Olefins, methyl
1120–1070	Stretching C–O	Secondary Hydroxyl