Kinetics and Equilibrium Studies of the Adsorption of Copper(II) Ions from Industrial Wastewater Using Activated Carbons Derived from Sugarcane Bagasse

Table 4

FTIR spectral analysis of BAC-P and BAC-Zn adsorbents.

BAC-P adsorbent
Peak	Frequency (cm^−1)		Difference	Assignment
	Before adsorption	After adsorption
1	3448.84	3443.05	−5.79	O-H stretch of hydroxyl group
2	2065.83	2098.62	+32.79	C-O group in alcohol
3	1624.12	1629.90	+5.78	C=O stretch of carboxylic acid
4	1437.02	1458.23	+21.21	C=C bond of aromatic ring
5	1165.04	1116.82	−48.22	C≡C bond of alkyne group
6	1064.74	1062.81	−1.93	C=O=C stretch of polysaccharides
7	781.20	792.77	+11.57	C-H stretch of aliphatic alkanes
BAC-Zn adsorbent
1	3441.12	3448.84	+7.72	O-H stretch of hydroxyl group
2	2050.40	2060.04	+9.64	C-O ring in alcohol
3	1616.40	1624.12	+7.72	C=O stretch of carboxylic acid
4	1435.09	1438.94	+3.85	C=C bond of aromatic ring
5	1186.26	1116.82	−69.44	C≡C bond of alkyne group
6	—	1070.53	—	C=O=C stretch of polysaccharides
7	781.20	754.19	−27.01	C-H stretch of aliphatic alkanes