Table 1 Independent variables and their levels employed in the central composite design
Variables | Units | Level of Variables | ||
|---|---|---|---|---|
Low | High | |||
X1 | Irradiation time | min | 0 | 360 |
X2 | p-cresol | Mg/L | 0 | 75 |
X3 | Photocatalyst | g/L | 0.5 | 4 |
X4 | pH | - | 4 | 10 |
Variables | Units | Level of Variables | ||
|---|---|---|---|---|
Low | High | |||
X1 | Irradiation time | min | 0 | 360 |
X2 | p-cresol | Mg/L | 0 | 75 |
X3 | Photocatalyst | g/L | 0.5 | 4 |
X4 | pH | - | 4 | 10 |