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. 2021 Nov 20;14(22):7045. doi: 10.3390/ma14227045

Figure 3.

Figure 3

The effect of the initial heavy metal ion concentration on (a) Cu(II) ions’ adsorption, (b) Zn(II) ions’ adsorption, and (c) simultaneous adsorption of Zn(II) and Cu(II) (pH 6, time 240 min, shaking speed 180 rpm, temperature: 22 ± 2 °C).