Research Article
Biosorption of Ni(II), Cr(III), and Co(II) from Solutions Using Acalypha hispida Leaf: Kinetics, Equilibrium, and Thermodynamics
Table 1
The FT-IR spectral characteristics of Acalypha hispida leaf before and after biosorption of Ni(II), Cr(III), and Co(II).
| | Metal ion | FTIR absorption band peak (cm−1) |
Assignment | | Before | After | Difference |
| | Ni(II) | 1215.19
| 1232.55 | 17.36 |
C–O stretch
| | Cr(III) | 1236.41 | 21.22 | | Co(II) | 1230.63 | 15.44 |
| | Ni(II) | 1444.73 | 1442.8 | −1.93 |
O–H bend
| | Cr(III) | 1440.87 | −3.86 | | Co(II) | 1440.87 | −3.86 |
| | Ni(II) | 1624.12
| 1626.05 | 2.07 |
N–H bend
| | Cr(III) | 1627.97 | 3.85 | | Co(II) | 1626.05 | 1.93 |
| | Ni(II) | 1647.26
| 1651.12 | 3.86 |
C=O stretch
| | Cr(III) | 1643.41 | −3.85 | | Co(II) | 1643.41 | −3.85 |
| | Ni(II) | 3313.82
| 3321.53 | 7.71 |
O–H stretch
| | Cr(III) | 3323.46 | 9.64 | | Co(II) | 3313.82 | 0 |
| | Ni(II) | 3402.54 | 3410.26 | 7.72 |
N–H stretch
| | Cr(III) | 3398.9 | −3.64 | | Co(II) | 3417.98 | 15.44 |
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