Experimental range and levels in the BBD.
| Factors | Levels | ||
|---|---|---|---|
| Low (−1) | Center (0) | High (+1) | |
| X 1: adsorbent dose (g) | 0.3 | 0.5 | 0.7 |
| X 2: pH | 6.5 | 8 | 9.5 |
| X 3: initial MB concentration (mg L−1) | 15 | 30 | 45 |
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