Equilibrium, Kinetics, and Thermodynamics of the Biosorption of Zn(II) from Aqueous Solution Using Powdered Cow Hooves

Table 4

FTIR spectral characteristics of CH before and after Zn(II) biosorption.

IR peak	Frequency (cm^−1) before adsorption	Frequency (cm^−1) after adsorption	Difference	Functional group
1	3314.00	3400	86	Bonded –OH group
2	2931.42	2937.14	5.72	Aliphatic C–H groups
3	2365.71	2354.28	−11.43	S–H stretching
4	1658.60	1646.63	−11.37	C=O stretching
5	1530.58	1529.79	−0.79	Amino/nitro compound
6	1393.00	1393.100	0	Nitro compound
7	1239.11	1236.26	−2.85	C–N stretching
8	1039.63	1039.63	0	C–O stretching