Table 5. Isothermal Parameters Obtained by Applying Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich Models for As(V), Cr(VI), and B(III), Testing Their Adsorption at Room Temperature.
| Langmuir |
Freundlich |
||||||
|---|---|---|---|---|---|---|---|
| metal ion | qm (mg/g) | KL (L/mg) | RL | R2 | KF (mg/g) | nF | R2 |
| As(V) | 28.2 | 0.26 | 0.96–0.23 | 0.99 | 5.76 | ||
| 5.76 | 1.23 | 0.99 | |||||
| Cr(VI) | 12.3 | 1.09 | 0.64–0.052 | 0.97 | 6.34 | 2.38 | 0.99 |
| B(III) | 23.7 | 0.04 | 0.99–0.65 | 0.96 | 1.40 | 1.39 | 0.98 |
| Temkin |
Dubinin–Radushkevich |
|||||
|---|---|---|---|---|---|---|
| metal ion | BT (kJ/mol) | KT (L/mg) | R2 | qm (mg/g) | ED–R (kJ/mol) | R2 |
| As(V) | 0.89 | 0.29 | 0.70 | 9.47 | 1.9 | 0.96 |
| Cr(VI) | 0.93 | 0.60 | 0.87 | 8.31 | 2.80 | 0.93 |
| B(III) | 1.06 | 0.01 | 0.88 | 4.21 | 1.98 | 0.84 |