Table 1.
Independent variables and their levels for Box-Behnken design
| Independent variables | Codes | Variable levels | ||
|---|---|---|---|---|
| −1 | 0 | +1 | ||
| Solvent to material ratio(ml/g) | X1 | 1:10 | 1:14 | 1:18 |
| Irradiation time(min) | X2 | 10 | 20 | 30 |
| pH value | X3 | 7 | 8 | 9 |
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