Biosorption of Pb(II) from Aqueous Solution Using Cow Hooves: Kinetics and Thermodynamics

Table 1

FTIR spectral characteristics of cow hoof before and after Pb(II) biosorption.

FTIR peak	Frequency (cm^−1) before adsorption	Frequency (cm^−1) after adsorption	Difference	Assignment
1	3754.28	3771.42	−17.14	–NH stretching
2	3314.00	3457.14	−143.14	Bonded –OH group
3	2931.42	2942.85	−11.43	Aliphatic C–H groups
4	2365.71	2365.71	—	S–H stretching
5	1658.60	1649.48	9.12	C=O stretching of an amide
6	1530.58	1535.19	−4.61	Amino/nitro compound
7	1393.00	1390.15	2.85	Nitro compound
8	1239.11	1239.11	—	C–N stretching
9	1039.63	1059.58	−19.95	C–O stretching