Research Article
Equilibrium, Kinetics, and Thermodynamics of the Removal of Nickel(II) from Aqueous Solution Using Cow Hooves
Table 3
FTIR spectral characteristics of CH before and after Ni (II) removal.
| IR peak | Frequency (cm−1) before adsorption | Frequency (cm−1) after adsorption | Difference | Functional group |
| 1 | 3314.00 | — | — | Bonded –OH group | 2 | 2931.42 | 2942.85 | 11.43 | Aliphatic C–H groups | 3 | 2365.71 | 2354.28 | −11.43 | S–H stretching | 4 | 1658.60 | 1652.33 | −6.27 | C=O stretching | 5 | 1530.58 | 1526.94 | −3.64 | Amino/nitro compound | 6 | 1393.00 | 1387.30 | −5.70 | Nitro compound | 7 | 1239.11 | 1233.41 | −5.70 | C–N stretching | 8 | 1039.63 | 1056.73 | 17.10 | C–O stretching |
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