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Table 2 Independent variables, their levels, and responses using split-plot CCD

From: Optimization of phenol adsorption from synthetic wastewater by synthesized BiFeO3 perovskite material, using split-plot central composite design

Run order Whole plot a: pH B: Time (min) C: Dosage (g) Phenol removal (YP%)
1 1 7 165 0.6 89.09
2   7 165 0.6 89.04
3   7 165 0.6 89.04
4 2 12 165 0.6 87.22
5   12 165 0.6 87.25
6 3 7 165 0.6 88.85
7   7 165 0.6 88.88
8   7 165 0.6 88.95
9 4 4 87 0.8 81.29
10   4 243 0.8 66.55
11   4 243 0.4 67.56
12   4 87 0.4 88.63
13 5 7 165 0.6 88.85
14   7 165 0.6 88.95
15   7 165 0.6 88.95
16 6 10 87 0.4 88.95
17   10 87 0.8 75.45
18   10 243 0.4 89.21
19   10 243 0.8 89.00
20 7 2 165 0.6 68.54
21   2 165 0.6 69.11
22 8 7 165 0.2 87.92
23   7 165 1.0 83.95
24   7 300 0.6 75.49
25   7 30 0.6 80.96
  1. 66.55 – 89.21% of phenol was removed using BiFeO3 as adsorbent