Kinetic model | parameters | Concentration (mg/L) | ||||
30 mg/L | 40 mg/L | 50 mg/L | 70 mg/L | 100 mg/L | ||
qe, exp. (mg/g) | 8.704 | 9.954 | 10.72 | 12.94 | 10.35 | |
Pseudo first-order | qe, calc. (mg/g) | 1.371 | 1.782 | 0.746 | 0.800 | 1.521 |
k1(min−1) | 0.478 | 0.295 | 0.225 | 0.188 | 0.267 | |
R2 | 0.8521 | 0.9924 | 0.5798 | 0.9649 | 0.9579 | |
∆qe (%) | 97.62 | 94.92 | 107.5 | 108.4 | 98.59 | |
Pseudo second-order | qe, calc. (mg/g) | 9.066 | 10.19 | 10.79 | 13.11 | 10.53 |
k2 (g/(mg・min)) | 0.372 | 0.336 | 0.966 | 0.539 | 0.424 | |
R2 | 0.9999 | 1.0000 | 0.9999 | 1.0000 | 0.9999 | |
∆qe (%) | 2.961 | 2.234 | 0.534 | 1.130 | 1.495 | |
Intra-particle diffusion | kp (mg/(g・min1/2)) | 0.205 | 0.298 | 0.160 | 0.180 | 0.283 |
C | 7.999 | 8.732 | 10.06 | 12.21 | 9.190 | |
R2 | 0.9219 | 0.8068 | 0.6835 | 0.8549 | 0.7514 | |
∆qe (%) | 3.252 | 3.957 | 2.122 | 1.985 | 3.621 |