Table 3.
Characteristic parameters and correlation coefficients of the experimental data according to Langmuir and Freundlich equations on zeolite at 25 ± 0.1°C.
| Metal | Ionic radius* (Å) | Electro negativity** |
Langmuir constant | Freundlich constant | ||||
|---|---|---|---|---|---|---|---|---|
| K L (mg/g) | b (L/mg) | Correlation coefficient (R 2) | K F (mg/g) | n | Correlation coefficient (R 2) | |||
| Co+2 | 1.88 | 1.88 | 1.27 | 23.99 | 0.986 | 16.16 | 0.340 | 0.983 |
| Cu+2 | 1.30 | 1.90 | 1.59 | 45.70 | 0.986 | 24.60 | 0.144 | 0.999 |
| Fe+2 | 1.83 | 1.83 | 2.86 | 67.12 | 0.986 | 26.50 | 0.205 | 0.985 |
| Cd+2 | 1.69 | 1.69 | 3.12 | 131.9 | 0.999 | 40.00 | 0.094 | 0.976 |
*Ionic radius (Å) and **electronegativity from [25].