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. 2021 Jun 15;11:12547. doi: 10.1038/s41598-021-91093-7

Figure 6.

Figure 6

Effect of pH on the removal of the studied metal ions using (a) CuO NPs-1 and (b) CuO NPs-2 at initial concentration: 20 mg L−1, contact time: 60 min, pH: 6, and dose: 0.33 g L−1.