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The obtained parameters from Langmuir, Freundlich, and Dubinin–Radushkevich (D-R) isotherm models
| Adsorbent | Langmuir isotherm | Freundlich isotherm | D-R isotherm | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| b (L mg−1) | Qe (mg g−1) | RL | R2 | Kf [mg g−1 (mg L−1) n] | 1/n | R2 | E (kJ mol−1) | qDR (mg g−1) | R2 | |
| NiO | 0.97 | 231.74 | 0.002 | 0.999 | 114.36 | 0.18 | 0.967 | 7.29 | 121.42 | 0.919 |
| Ni/NiO(g) | 0.12 | 216.96 | 0.017 | 0.999 | 37.33 | 0.35 | 0.911 | 0.95 | 142.47 | 0.936 |
| Ni/NiO(u) | 0.30 | 222.04 | 0.007 | 0.999 | 64.43 | 0.25 | 0.956 | 1.72 | 149.22 | 0.925 |
