Table 2.
Adsorption isotherm data for Cr6+ ions adsorption on PCAC-IO nano-composite at room temperature.
| Adsorption ısotherm model | Parameters | Activated carbon-ıron oxide composites (PCAC-IO) (g/L) | ||||||
|---|---|---|---|---|---|---|---|---|
| 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | 4.0 | 5.0 | ||
| Langmuir | R2 | 0.990 | 0.983 | 0.995 | 0.999 | 0.997 | 0.986 | 0.993 |
| Qm (mg/g) | 151.52 | 94.34 | 91.74 | 64.94 | 63.69 | 47.85 | 43.48 | |
| Ka | 0.02 | 0.03 | 0.01 | 0.02 | 0.02 | 0.06 | 0.18 | |
| Freundlich | R2 | 0.629 | 0.614 | 0.859 | 0.890 | 0.924 | 0.960 | 0.878 |
| 1/n | 0.63 | 0.54 | 0.47 | 0.45 | 0.32 | 0.22 | 0.16 | |
| KF (mg1–1/nL1/ng−1) | 4.22 | 4.73 | 5.37 | 4.77 | 9.17 | 14.22 | 18.38 | |