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

Environmental Systems Research

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

SN	Wave length in cm⁻¹	Peaks nature of AC		Functional groups
SN	Wave length in cm⁻¹	Before	After treatment	Functional groups
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