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Table 1 Independent variables and their levels

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

Independent variable Unit Symbol Levels
− α − 1 0  + 1  + α
pH   a 2 4 7 10 12
Time Min B 30 87 165 243 300
Dosage G C 0.2 0.4 0.6 0.8 1.0