Removal of Pb from Water by Adsorption on Apple Pomace: Equilibrium, Kinetics, and Thermodynamics Studies

Table 1

FTIR spectral characterization of AP before and after Pb adsorption.

IR peaks		Assignment
	Before adsorption	After adsorption	Differences	Functional groups
1	3410.2	3390.1	−20.1	–OH group in bonded form
2	2919.8	2918.9	−0.9	Aliphatic –C–H stretching
3	2850.7	2850.3	−0.4	–C–H streching
4	1733.9	1735.4	1.5	–C=O, stretching of ester group
5	1645.3	Disappear	Unknown	–C=O stretching of carbonyl group
6	1455.7	1462.9	7.2	Carboxyl groups
7	1375.0	1375.3	0.3	–C–O–C– stretching of ethers groups
8	1160.6	1161.0	0.4	–C–O streching
9	1053.7	1035.5	−18.2	–C=O group
10	570.4	570.2	−0.2	–C–C– groups