Table 3 Langmuir isotherm model parameters and correlation coefficients for the adsorption of Cu2+ and Fe3+ on ZnO, SiO2, and MgO NPs.
Langmuir isotherm model parameters | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Metal ions | Temperature | ZnO | SiO2 | MgO | ||||||
qmax (mg g−1) | KL (L mg−1) | R2 | qmax (mg g−1) | KL (L mg−1) | R2 | qmax (mg g−1) | KL (L mg−1) | R2 | ||
Cu2+ | 298 | 135.13 | 9.54 | 0.98 | 58.82 | 2.00 | 0.94 | 66.22 | 0.01 | 0.94 |
313 | 370.37 | 1.61 | 0.97 | 150.57 | 9.12 | 0.94 | 305.81 | 1.38 | 0.99 | |
338 | 403.22 | 1.42 | 0.95 | 333.33 | 6.30 | 0.92 | 370.37 | 1.51 | 0.97 | |
Fe3+ | 298 | 104.16 | 4.50 | 0.98 | 93.45 | 5.10 | 0.98 | 100.00 | 12.02 | 0.99 |
313 | 333.33 | 3.98 | 0.99 | 294.11 | 1.41 | 0.97 | 285.71 | 5.12 | 0.97 | |
338 | 454.54 | 2.63 | 0.94 | 416.66 | 3.60 | 0.92 | 666.66 | 3.34 | 0.92 | |
