Values of constants of different adsorption isotherms applied on adsorption of malachite green and ethyl violet on graphene oxide–gold nanocomposite. [KL = Langmuir constant, qm = maximum adsorbed amount of adsorbate on per gram of adsorbent at equilibrium, R2 = coefficient of determination, RL = separator factor in Langmuir isotherm, KF = Freundlich adsorption constant, n = equilibrium constants of adsorption intensity, KT = equilibrium binding constant, B = Temkin constant. Reaction conditions; aqueous solution 7 μM EV or 7 μM MG = 50 ml, GO–Au nanocomposite adsorbent = 5 mg, 100 rpm, 30 °C].
| Isotherm | Constants | Dye | |
|---|---|---|---|
| Malachite green | Ethyl violet | ||
| Langmuir | K L (L g−1) | 0.016 | 0.371 |
| q m (mg g−1) | 1000 | 13.33 | |
| R 2 | 0.7201 | 0.6410 | |
| R L | 1 | 1 | |
| Freundlich | K F (L g−1) | 16.136 | 8.00 |
| n | 0.993 | 0.500 | |
| R 2 | 0.9972 | 0.9936 | |
| Temkin | K T (L g−1) | 0.805 | 1.125 |
| B | 65.99 | 38.637 | |
| R 2 | 0.9448 | 0.9804 | |