Table 3.
Fitting parameters for the fitting of pseudo-first order (up) and pseudo-second order (down) kinetic equations for the sorption of imidacloprid, at 25 °C and 200 or 500 ppm.
| Ci = 200 ppm | PCD | PCD/AC5% | PCD/AC10% | AC |
| qe,exp (mg g−1) | 10.3 (±0.6) | 14.6 (±0.5) | 24.1 (±0.3) | 37.4 (±0.6) |
| qe (mg g−1) | 10.4 (±0.2) | 15.0 (±0.2) | 24.1 (±0.4) | 37.2 (±0.9) |
| k1 (10−2 min−1) | 75 (±4) | 18.4 (±0.7) | 27.4 (±0.2) | 67 (±5) |
| R2 | 0.9869 | 0.9984 | 0.9953 | 0.9758 |
| AIC | −20.6 | −31.5 | −6.2 | 23.0 |
| qe (mg g−1) | 11.0 (±0.1) | 19.0 (±0.3) | 28.1 (±0.4) | 39.2 (±0.5) |
| k2 (10−2 g mg−1 min−1) | 9.7 (±0.5) | 0.83 (±0.01) | 0.96 (±0.07) | 2.4 (±0.1) |
| R2 | 0.9953 | 0.9983 | 0.9970 | 0.9951 |
| AIC | −33.0 | −28.7 | −9.8 | 2.6 |
| Ci = 500 ppm | PCD | PCD/AC5% | PCD/AC10% | AC |
| qe,exp (mg g−1) | 23 (±3) | 31 (±3) | 32 (±2) | 223.9 (±0.3) |
| qe (mg g−1) | 24.3 (±0.4) | 31.1 (±0.5) | 33.3 (±0.6) | 219 (±2) |
| k1 (10−2 min−1) | 7.1 (±0.7) | 6.5 (±0.5) | 8.4 (±0.8) | 5.7 (±0.2) |
| R2 | 0.9834 | 0.9890 | 0.9821 | 0.9975 |
| AIC | 15.0 | 15.6 | 27.9 | 75.7 |
| qe (mg g−1) | 27.8 (±0.7) | 36.0 (±0.7) | 37.6 (±0.7) | 258(±1) |
| k2 (10−2 g mg−1 min−1) | 0.33 (±0.05) | 0.23 (±0.02) | 0.31 (±0.03) | 0.030 (±0.001) |
| R2 | 0.9844 | 0.9931 | 0.9898 | 0.9996 |
| AIC | 15.9 | 7.6 | 18.2 | 32.21 |