Table 4.
Kinetic parameters for 2,4-DNP adsorption onto βCD-TDI and βCD-HDI.
| kinetic models | parameters | βCD-TDI | βCD-HDI |
|---|---|---|---|
| pseudo-first-order kinetic model | qe,exp (mg g−1) | 3.954 | 3.469 |
| qe,cal (mg g−1) | 0.041 | 0.166 | |
| K1 (min−1) | 0.022 | 0.042 | |
| Δq (%) | 31.290 | 30.110 | |
| relative error (%) | 98.960 | 95.220 | |
| R2 | 0.604 | 0.916 | |
| pseudo-second-order kinetic model | qe,cal (mg g−1) | 3.895 | 3.438 |
| K2 (g mg−1 min−1) | 0.027 | 0.090 | |
| t1/2 (min) | 8.850 | 3.120 | |
| Δq (%) | 0.472 | 0.283 | |
| relative error (%) | 1.490 | 0.894 | |
| R2 | 0.9993 | 0.9998 | |
| Elovich equation | qe,cal (mg g−1) | 3.895 | 3.438 |
| β | 0.169 | 5.227 | |
| α | 10.413 | 111829.14 | |
| R2 | 0.8656 | 0.9875 | |
| intraparticle diffusion | qe,cal (mg g−1) | 3.895 | 3.438 |
| Ki (mg g−1 min1/2) | 0.016 | 0.019 | |
| C (mg g−1) | 3.098 | 3.163 | |
| R2 | 0.9666 | 0.9652 | |
| external diffusion | C | −407 | −355 |
| R2 | 0.8434 | 0.8509 |