Figure 1.
Figure 2.
Figure 3.
The parameters of kinetics models
| Kinetics model | Parameter | 100 mg/L | 700 mg/L |
|---|---|---|---|
| Pseudo-first-order | qe | 38.5 | 78.0 |
| k1 | 0.1114 | 0.0684 | |
| R2 | 0.851 | 0.911 | |
| RMSE | 0.70 | 1.03 | |
| Pseudo-second-order | qe | 43.8 | 93.6 |
| k2 | 0.0028 | 0.00070 | |
| R2 | 0.973 | 0.986 | |
| RMSE | 0.29 | 0.41 |
The parameters of sorption isotherm models
| Isotherm model | Parameter | Unit | Values of parameters |
|---|---|---|---|
| Freundlich | 1/n | - | 0.108 |
| Kf | mg(1–1/n)L(1/n)/g | 35.89 | |
| R2 | - | 0.892 | |
| RMSE | - | 3.23 | |
| Langmuir | qm | mg/g | 71.6 |
| KL | L/mg | 0.0944 | |
| R2 | - | 0.928 | |
| RMSE | - | 2.64 | |
| Jovanovic | qmax | mg/g | 69.0 |
| KJ | L/g | 0.0666 | |
| R2 | - | 0.796 | |
| RMSE | - | 4.44 | |
| Dubinin- Radushkevich | Qs | mg/g | 69.0 |
| KDR | mol2/kJ2 | 17.77 | |
| E | kJ/mol | 0.17 | |
| R2 | - | 0.815 | |
| RMSE | - | 4.20 | |
| Sips | qmS | mg/g | 78.1 |
| Ks | L/mg | 0.2675 | |
| SP | - | 0.572 | |
| R2 | - | 0.967 | |
| RMSE | - | 1.78 | |
| Toth | qmT | mg/g | 79.0 |
| Kt | L/mg | 0.5054 | |
| t | - | 0.510 | |
| R2 | - | 0.967 | |
| RMSE | - | 1.78 |