Table 4. Regression parameters of isotherm models.
| Isotherm | Analytes | Temperature (K) | Parameters | ||
|---|---|---|---|---|---|
| Langmuir | KL(l mg−1) | qm(mg g−1) | R2 | ||
| PHE | 298 | 4.87 | 0.484 | 0.855 | |
| 303 | 2.80 | 0.572 | 0.868 | ||
| 308 | 2.73 | 0.512 | 0.820 | ||
| ANT (low*/high*) | 298 | 260/–14.7 | 0.094/–0.184 | 0.993/0.977 | |
| 303 | 216/–10.8 | 0.094/–0.259 | 0.972/0.817 | ||
| 308 | 148/–4.71 | 0.101/–0.663 | 0.979/0.829 | ||
| Freundlich | KF(l g−1) | n | R2 | ||
| PHE | 298 | 0.662 | 1.50 | 0.992 | |
| 303 | 0.729 | 1.25 | 0.975 | ||
| 308 | 0.614 | 1.28 | 0.965 | ||
| ANT (low*/high*) | 298 | 0.297/118 | 2.99/0.528 | 0.996/0.978 | |
| 303 | 0.293/34.9 | 2.92/0.626 | 0.986/0.949 | ||
| 308 | 0.399/7.93 | 2.38/0.824 | 0.999/0.985 | ||
| Temkin | A (L g−1) | b (kJ mol−1) | R2 | ||
| PHE | 298 | 120 | 34.9 | 0.847 | |
| 303 | 66.5 | 31.1 | 0.914 | ||
| 308 | 61.5 | 33.3 | 0.908 | ||
| ANT (low*/high*) | 298 | 3143/58.9 | 130.4/7.79 | 0.988/0.862 | |
| 303 | 2683/56.6 | 132.6/9.09 | 0.955/0.846 | ||
| 308 | 1552/58.7 | 111.3/12.3 | 0.984/0.909 | ||
| D–R | qm′ (mol kg−1) | EDR(kJ mol−1) | R2 | ||
| PHE | 298 | 0.292 | 5 | 0.932 | |
| 303 | 0.339 | 4.08 | 0.985 | ||
| 308 | 0.306 | 4.08 | 0.976 | ||
| ANT (low*/high*) | 298 | 0.132/4.88 | 10/3.54 | 0.996/0.967 | |
| 303 | 0.128/2.54 | 9.13/3.54 | 0.974/0.929 | ||
| 308 | 0.153/1.24 | 8.45/4.08 | 0.994/0.970 | ||
*
Low: C0 (initial concentration) < 0.1 mg l–1; high: C0 (initial concentration) ≥ 0.1 mg l–1.