Table 2. Adsorption Parameters of the Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich Isotherms for the Adsorption of Pb(II) onto Bare CANPs and rPbrD-CANPs.
| adsorption parameters | CANPs | rPbrD-CANPs |
|---|---|---|
| Experimental Adsorption Capacity | ||
| Qmax (mg/g) | 3.34 | 8.82 |
| Langmuir Isotherm | ||
| Qmax (mg/g) | 0.24 | 0.13 |
| KL (L/mg) | 5.49 | 7.16 |
| R2 | 0.9539 | 0.378 |
| Freundlich Isotherm | ||
| 1/n | 0.84 | 2.06 |
| n | 1.19 | 0.49 |
| Kf (mg/g) | 1.03 | 1.01 |
| R2 | 0.9134 | 0.8772 |
| Temkin Isotherm | ||
| At (L/mg) | 2.18 | 1.15 |
| Bt | 9.98 | 2.55 |
| B (J/mol) | 248.3 | 972.7 |
| R2 | 0.7735 | 0.324 |
| Dubinin–Radushkevich Model | ||
| Qs (mg/g) | 123.53 | 598.60 |
| Kad (mol2/kJ2) | 6 × 10–7 | 1 × 10–6 |
| E (J/mol) | 912.87 | 707.106 |
| R2 | 0.6412 | 0.8108 |