Table 5 Parameters of the isotherm models for the adsorption of U(VI) ions on the P-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) | 220.73 | 1748.3 | 1222.2 |
n | 0.422 | 0.392 | 0.281 | |
A (mol × g−1) | 3.26 × 10−2 | 3.5 × 10−2 | 3.32 × 10−2 | |
R 2 | 0.9494 | 0.9489 | 0.9255 | |
Dubinin–Radushkevich | K D-R (mol2/kJ2) | 2.96 × 10−9 | 2.08 × 10−9 | 1.21 × 10−9 |
Q m (mol × g−1) | 1.12 × 10−3 | 2.75 × 10−3 | 1.19 × 10−3 | |
E n (kJ × mol−1) | 12.99 | 15.5 | 16.33 | |
R 2 | 0.9898 | 0.9655 | 0.9267 | |
Freundlich | K F (dm3 × mol−1) | 4.35 | 2.34 | 0.815 |
n | 0.38 | 0.32 | 0.21 | |
R 2 | 0.9494 | 0.9498 | 0.9259 |