Fig. 4From: Optimization of phenol adsorption from synthetic wastewater by synthesized BiFeO3 perovskite material, using split-plot central composite designa 3D response surface for interaction between time and pH for phenol adsorption. b 3D response surface for interaction between pH and dosage for phenol adsorption. c 3D response surface for interaction between time and dosage for phenol adsorptionBack to article page