Table 2.
The kinetic (PFO) sorption parameters for roxarsone (Qe, mmol/g) with the various sorbent materials (Co: 0.18 mM, amount of adsorbents: 0.030 g, V = 0.20 L) at 21 °C at pH 7.00 in water for 24 h.
| Adsorbents | qe (mmol/g) | kobs (min−1) × 103 | R2 | Chi2/DoF |
|---|---|---|---|---|
| Mag-P | 0.105 ± 0.007 | 9.86 ± 1.58 | 0.932 | 1.20 × 10−4 |
| Mag-C | 0.081 ± 0.011 | 4.68 ± 1.86 | 0.803 | 2.60 × 10−4 |
| CM-19 | 0.258 ± 0.018 | 2.18 ± 0.33 | 0.940 | 3.60 × 10−4 |
| GAC | 0.748 ± 0.091 | 0.580 ± 0.100 | 0.995 | 1.10 × 10−4 |
| Goethite | 0.244 ± 0.015 | 41.5 ± 12.3 | 0.871 | 1.34 × 10−3 |
| Goethite 1 | 0.262 ± 0.013 | 210 ± 60.0 | 0.938 | 6.50 × 10−4 |
Note: Mag-P is the synthetic material, Mag-C is the commercial material.1. Represents the estimate obtained using the PSO model (Equation (3)).