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. 2021 Mar 6;26(5):1426. doi: 10.3390/molecules26051426

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