Table 1: FTIR spectral characteristics of cow hoof before and after Pb(II) biosorption.

FTIR peakFrequency (cm−1) before adsorptionFrequency (cm−1) after adsorptionDifference Assignment

13754.283771.42−17.14–NH stretching
23314.003457.14−143.14Bonded –OH group
32931.422942.85−11.43Aliphatic C–H groups
42365.712365.71S–H stretching
51658.601649.489.12C=O stretching of an amide
61530.581535.19−4.61Amino/nitro compound
71393.001390.152.85Nitro compound
81239.111239.11C–N stretching
91039.631059.58−19.95C–O stretching