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The effect of the solution pH on (a) Cu(II) ions’ adsorption, (b) Zn(II) ions’ adsorption, and (c) simultaneous adsorption of Zn(II) and Cu(II) (mass of sorbent: 0.01 g, heavy metal ions’ concentration: 10 mg/L, time 240 min, shaking speed 180 rpm, temperature: 22 ± 2 °C).
