Figure 20

3D and 2D response surface plots, (a–b) CIPF dosage and Green 5% Co–ZnO NPs dosage, (c–d) shaking speed (rpm) and Green 5% Co–ZnO NPs dosage, (e–f) pH value and Green 5% Co–ZnO NPs dosage, (g–h) CIPF dosage and shaking speed, (i–j) pH value and CIPF dosage, (k–l) pH value and shaking speed.