Table 2 Adsorption isotherm parameters of CV and MB dyes on ASS adsorbent (adsorbent dose of 50 mg, volume of adsorbate of 20 mL, contact time of 60 min, pH of 8, and temperature of 27 °C)
| Models | Parameters | Adsorbate | |
|---|---|---|---|
| MB | CV | ||
| Langmuir | qm (mg g− 1) | 51 | 99 |
| KL × 10−2 (L mg− 1) | 1.58 | 2.40 | |
| R 2 | 0.913 | 0.977 | |
| Freundlich | KF ((mg g−1) (L mg− 1)1/n) | 1.05 | 1.07 |
| n | 0.753 | 0.806 | |
| R 2 | 0.975 | 0.995 | |
| Dubinin-Raduskevich | qDR (mg g−1) | 21 | 23 |
| BDR × 10−6 (mol2 kJ−2) | −2.9 | −2.7 | |
| R 2 | 0.892 | 0.963 | |
| Temkin | bTe (J mol−1) | 12.49 | 12.32 |
| KTe (L g−1) | 2.06 | 2.08 | |
| R 2 | 0.606 | 0.738 | |