Table 6 Parameters of the isotherm models for the adsorption of U(VI) ions on the C-HAP
From: Adsorption of Uranyl Ions at the Nano-hydroxyapatite and Its Modification
Model | Parameter | 293 K | 313 K | 333 K |
|---|---|---|---|---|
Langmuir–Freundlich | K L-F (dm3 × mol−1) | 3398.73 | 1092.3 | 4149.2 |
n | 0.904 | 0.332 | 1.13 | |
A (mol × g−1) | 7.45 × 10−3 | 1.27 × 10−2 | 6.9 × 10−3 | |
R 2 | 0.9464 | 0.9425 | 0.9615 | |
Dubinin–Radushkevich | K D-R (mol2 × kJ−2) | 4.73 × 10−9 | 1.53 × 10−9 | 6.2 × 10−10 |
Q m (mol × g−1) | 1.66 × 10−3 | 2.57 × 10−3 | 2.3 × 10−3 | |
E n (kJ × mol−1) | 10.28 | 18.1 | 18.4 | |
R 2 | 0.9475 | 0.9345 | 0.8930 | |
Freundlich | K F (dm3 × mol−1) | 0.11 | 0.0314 | 0.0136 |
n | 0.423 | 0.222 | 0.0821 | |
R 2 | 0.9411 | 0.9498 | 0.9213 |