Table 8 Kinetic parameters of the first and second stage of adsorption of MB on agar and those of on pure agarose obtained from the pseudo-first-order, pseudo-second-order and pore-diffusion kinetic models at 318 K
From: Adsorptive removal of methylene blue by agar: effects of NaCl and ethanol
| Â | pseudo-first-order | pseudo-second-order | pore-diffusion | ||||||
|---|---|---|---|---|---|---|---|---|---|
[MB](M) | qe,1 (mg g-1) | k1 (min-1) | Δq t | qe,2 (mg g-1) | k2(*) | Δq t | k dif (*) | I(mg g-1) | R 2 |
| Â | First stage of process on agar | ||||||||
0.0001 | 2.71 | 1.625 | 9.14 | 3.89 | 0.329 | 3.58 | 2.487 | -0.278 | 0.990 |
0.0003 | 13.87 | 1.144 | 6.79 | 17.24 | 0.069 | 4.49 | 5.046 | 3.950 | 0.969 |
| Â | Second stage of process on agar | ||||||||
0.0001 | 4.75 | 0.0106 | 29.53 | 5.52 | 0.0026 | 20.79 | 0.322 | -0.106 | 0.998 |
0.0003 | 11.80 | 0.0031 | 16.89 | 14.93 | 0.0002 | 7.96 | 0.435 | -0.743 | 0.996 |
| Â | Pure agarose | ||||||||
0.0001 | 7.04 | 0.0066 | 1.85 | 9.52 | 0.0006 | 2.35 | 0.337 | -0.091 | 0.971 |
0.0003 | 9.10 | 0.0234 | 6.58 | 12.35 | 0.0016 | 3.23 | 0.893 | -0.572 | 0.979 |