Table 3 Optimum conditions and the predicted adsorption yield value of the response at the optimum conditions.
Factor | Eggshell (ES) | Eggshell membrane (ESM) | Eggshell with a membrane (ESWM) | Calcined eggshell (CES4) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Low | High | Optimum conditions | Modified condition | Low | High | Optimum conditions | Modified condition | Low | High | Optimum conditions | Modified condition | Low | High | Optimum conditions | Modified condition | |
Reaction time (h) | 12 | 36 | 21.4621 | 21.5 | 12 | 36 | 12 | 12 | 12 | 36 | 12 | 12 | 20 | 60 | 20.0703 | 20 |
Concentration (mg/L) | 25 | 75 | 75 | 75 | 25 | 75 | 74.582 | 75 | 25 | 75 | 74.9916 | 75 | 100 | 200 | 179.764 | 180 |
Adsorption dose (g) | 1 | 2 | 1.44505 | 1.445 | 100 | 200 | 200 | 200 | 1 | 2 | 2 | 2 | 1 | 19 | 19 | 19 |
Adsorption (%) | 95.8064 | 75.3847 | 80.6 | 100 | ||||||||||||
