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Table 3 FTIR analyses, AC peak observed and corresponding functional groups

From: Fluoride removal from aqueous solution onto activated carbon of Catha edulis through the adsorption treatment technology

SN Wave length in cm−1 Peaks nature of AC Functional groups
Before After treatment
1 3300–3600 Small sharp peak Diminished small sharp peak Presence of O–H
2 2944 Small sharp peak Small sharp peak Stretching C–H
3 1500–1600 Long and broad peak Diminished small peak Carboxylate bond
4 1425 Small peak Very small peak C–C stretched (aromatic)
5 800 Sharp peak No peak C=CH stretched