Table 5.
Parameters of pseudo-first-order model, pseudo-second-order model and intraparticle diffusion model for MB and Pb2+ adsorption on CBPG.
| Models | Parameters | Pollutants | |
|---|---|---|---|
| MB | Pb(II) | ||
| Experiment | qexp (mg/g) | 36.55 | 143.38 |
| Pseudo-first-order | qm (mg/g) | 34.69 | 139.17 |
| k1 (g/mg·min) | 0.33 | 0.97 | |
| r2 | 0.97 | 0.99 | |
| Pseudo-second-order | qm (mg/g) | 36.09 | 143.70 |
| k2 (g/mg·min) | 0.02 | 0.0064 | |
| r2 | 0.99 | 1.00 | |
| Intraparticle diffusion | ki−film (mg/(g·min1/2)) | 1.26 | 5.57 |
| Ci−film (mg/g) | 26.76 | 108.56 | |
| r2i−film | 0.98 | 0.98 | |
| ki−pore (mg/(g·min1/2)) | 0.69 | 0.83 | |
| Ci−pore (mg/g) | 29.38 | 135.42 | |
| r2i−pore | 0.77 | 0.91 | |
| ki−ad (mg/(g·min1/2)) | 0.20 | 0.10 | |
| Ci−ad (mg/g) | 34.44 | 142.06 | |
| r2i−ad | 0.98 | 0.82 | |