Copper-Doped Zinc Oxide Nanoparticles: Synthesis, Characterization, and Application for Adsorptive Removal of Toxic Azo Dye

Figure 2

(a) Response surface plots for adsorption of CR onto Cu/ZnONP: interactive effects of pH and time, (b) response surface plots for adsorption of CR onto Cu/ZnONP: interactive effects of time and concentration, (c) response surface plots for adsorption of CR onto Cu/ZnONP: interactive effects of pH and dosage, and (d) response surface plots for adsorption of CR onto Cu/ZnONP: interactive effects of dosage and concentration.

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