Table 7 Parameters of the isotherm models for the adsorption of U(VI) ions on the HAP, (R 2 – correlation)
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 (mol2 × kJ−2) | 13524.54 | 15123.8 | 16724.8 |
n | 9.17 | 0.963 | 0.645 | |
A (mol × g−1) | 3.37 × 10−3 | 3.6 × 10−3 | 4.21 × 10−3 | |
R 2 | 0.9808 | 0.9686 | 0.979 | |
Dubinin–Radushkevich | K D-R (mol2 × kJ−2) | 3.53 × 10−9 | 2.87 × 10−9 | 2.02 × 10−9 |
Q m (mol × g−1) | 2.95 × 10−3 | 2.82 × 10−3 | 1.78 × 10−3 | |
E n (kJ × mol−1) | 11.9 | 13.2 | 15.8 | |
R 2 | 0.9523 | 0.9518 | 0.9742 | |
Freundlich | K F (dm3 × mol−1) | 0.0349 | 0.0354 | 0.025 |
n | 0.318 | 0.31 | 0.259 | |
R 2 | 0.9595 | 0.9582 | 0.975 |