Table 3.
Number of moles sorbed (Nf), parameters of the Freundlich (n and Kf), Temkin (b and KT), correlation coefficients (r), and respective error for the interaction of divalent metals with chitosan CH-AN at 298 ± 1 K, using a linear method.
| Isotherm | Constant | Cu(II) | Pb(II) |
|---|---|---|---|
| Freundlich | Kf (mmol g−1) | 0.61 ± 0.01 | 0.91 ± 0.02 |
| n | 1.61 ± 0.03 | 2.56 ± 0.02 | |
| R2 | 0.975 | 0.954 | |
| SE | 0.21 | 0.42 | |
| χ2 | 3.55 | 0.928 | |
| Temkin | KT (mmol dm−3) | 3.55 ± 0.03 | 2.96 ± 0.04 |
| b (kJ mol−1) | 1.46 ± 0.02 | 1.64 ± 0.02 | |
| R2 | 0.987 | 0.984 | |
| SE | 0.03 | 0.05 | |
| χ2 | 0.09 | 0.021 |