Kinetic model parameters for the adsorption of Cu2+ on SPAC.
| Model | Parameters | Unit | Value |
|---|---|---|---|
| PFO | q exp | mg g−1 | 98.82 |
| q e(PFO) | mg g−1 | 97.069 | |
| K 1 | min−1 | 0.1998 | |
| t 0.5 | min | 3.469 | |
| adj-R2 | — | 0.997 | |
| SD | — | 8.391 | |
| Red-χ2 | — | 3.425 | |
| PSO | q e(PSO) | mg g−1 | 100.729 |
| K 2 | g (min−1 mg−1) | 0.0057 | |
| adj-R2 | — | 0.993 | |
| SD | — | 19.783 | |
| Red-χ2 | — | 8.076 | |
| Elovich | α | mg (g−1 min−1) | 6.415 × 106 |
| β | mg g−1 | 0.1848 | |
| adj-R2 | — | 0.988 | |
| Red-χ2 | — | 13.227 | |
| Avrami | q e(AV) | mg g−1 | 96.857 |
| K AV | min−1 | 0.122 | |
| n AV | — | 3.325 | |
| adj-R2 | — | 0.991 | |
| SD | — | 26.877 | |
| Red-χ2 | — | 10.017 | |
| Intraparticle diffusion | First stage | ||
| C 1 | mg g−1 | 2.4379 | |
| K int | mg (g−1 min−0.5) | 22.867 | |
| adj-R2 | — | 0.961 | |
| Second stage | |||
| C 2 | mg g−1 | 90.949 | |
| K int | mg (g−1 min−0.5) | 0.736 | |
| adj-R2 | — | 0.993 | |