Table 3 Isotherm parameters and the correlation coefficient, R2 for the adsorption of NH4+ onto (0.03 g) D-Cu2+.
T (K) | Langmuir isotherm | Freundlich isotherm | Temkin isotherm | Dubinin-Radushkevich isotherm | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
qmax (mg/g) | KL (L/mg) | RL | R2 | SSE | KF (mg/g) | 1/n | R2 | SSE | KT (L/mg) | B1 (J/mol) | R2 | SSE | qm (mg/g) | B/10–4 (mol2 kJ-2) | E (kJ/mol) | R2 | SSE | |
Linear form | ||||||||||||||||||
293 | 72.67 ± 0.01 | 0.024 ± 0.20 | 0.123 | 0.445 | 0.026 | 0.125 ± 1.82 | 0.472 ± 0.59 | 0.811 | 0.215 | 0.133 ± 5.79 | 95.59 ± 1.72 | 0.912 | 8.501 | 219.9 ± 0.08 | -0.656 | 87.32 ± 0.01 | 0.964 | 0.023 |
303 | 163.1 ± 0.01 | 0.013 ± 0.22 | 0.205 | 0.162 | 0.053 | 0.634 ± 1.96 | 0.659 ± 0.61 | 0.674 | 0.376 | 0.140 ± 3.96 | 79.66 ± 1.12 | 0.944 | 4.500 | 195.6 ± 0.07 | -0.662 | 86.90 ± 0.01 | 0.964 | 0.021 |
313 | 94.16 ± 0.01 | 0.010 ± 0.20 | 0.252 | 0.638 | 0.042 | 0.122 ± 1.01 | 0.582 ± 0.27 | 0.930 | 0.086 | 0.054 ± 6.03 | 100.5 ± 1.51 | 0.936 | 4.614 | 189.2 ± 0.13 | -2.224 | 47.42 ± 0.01 | 0.919 | 0.058 |
Non-linear form | ||||||||||||||||||
293 | 333.6 ± 1.37 | 0.023 ± 0.01 | 0.128 | 0.915 | 11.22 | 14.98 ± 0.80 | 1.595 ± 0.38 | 0.855 | 13.98 | – | – | – | – | – | – | – | ||
303 | 280.9 ± 0.68 | 0.025 ± 0.01 | 0.119 | 0.989 | 5.671 | 16.34 ± 0.68 | 1.772 ± 0.35 | 0.897 | 8.156 | – | – | – | – | – | – | – | ||
313 | 421.3 ± 0.52 | 0.006 ± 0.01 | 0.359 | 0.944 | 7.039 | 3.823 ± 0.27 | 1.213 ± 0.25 | 0.893 | 7.756 | – | – | – | – | – | – | – | ||
