Table 5.
Kinetic parameters for OFL adsorption onto HNT, HNT/Fe3O4-C, HNT/Fe3O4-H, and HNT/Fe3O4-SG.
| Kinetic Model | Kinetic Parameter | HNT | HNT/Fe3O4-C | HNT/Fe3O4-SG | HNT/Fe3O4-H |
|---|---|---|---|---|---|
| Pseudo-first order | qe (mg g−1) | 5.02 (4) | 2.95 (5) | 5.3 (2) | 7.7 (2) |
| k1 (min−1) | 124 | 3.0 (3) | 2.4 (4) | 2.8 (5) | |
| R2 | 0.9996 | 0.9961 | 0.9854 | 0.9839 | |
| χ2 | 0.0041 | 0.0086 | 0.1052 | 0.1931 | |
| Pseudo-second order | qe (mg g−1) | 5.02 (6) | 3.08 (3) | 5.6 (2) | 8.0 (1) |
| k2 (g mg−1 min−1) | 3888 | 1.8 (2) | 0.7 (2) | 0.61 (9) | |
| R2 | 0.9996 | 0.9992 | 0.9926 | 0.9965 | |
| χ2 | 0.0041 | 0.0017 | 0.0531 | 0.0418 |