Table 2.
R2 and constant values for the different adsorption kinetics models of Zn(II), Cd(II) and Hg(II) on TLSB.
| Metals | Parameters | Pseudo-first-order model | Pseudo-second-order model | Intraparticle diffusion model | Double constant equation model | Elovich model | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Zn(II) | R2 | 0.4525 | 0.9947 | 0.8431 | 0.8772 | 0.9022 | |||||
| Constants | k1 | 0.0201 min−1 | k2 | 0.308 g (min/min)−1 | ki | 0.339 mg/(g min0.5) | A | 0.1980 | α | 9.17 mg/(g min) | |
| qe | 247.08 mg/g | qe | 366.83 mg/g | B | 0.0963 | β | 0.0211 g/mg | ||||
| Cd(II) | R2 | 0.4932 | 0.9926 | 0.9186 | 0.8589 | 0.9496 | |||||
| Constants | k1 | 0.011 min−1 | k2 | 0.587 g (min/min)−1 | ki | 0.116 mg/(g min0.5) | A | 0.0880 | α | 8.01 mg/(g min) | |
| qe | 310.41 mg/g | qe | 471.23 mg/g | B | 0.1007 | β | 0.008 g/mg | ||||
| Hg(II) | R2 | 0.8298 | 0.9956 | 0.9218 | 0.8779 | 0.9773 | |||||
| Constants | k1 | 0.014 min−1 | k2 | 0.291 g (min/min)−1 | ki | 0.241 mg/(g min0.5) | A | 0.0097 | α | 18.25 mg/(g min) | |
| qe | 274.10 mg/g | qe | 205.11 mg/g | B | 0.6811 | β | 0.0019 g/mg | ||||