Figure 5.
Effect of contact time on (a) Pb2+, (b) Cu2+, and (c) Cr3+ adsorption. Adsorption conditions: 300 mg/L of Pb2+, 700 mg/L of Cu2+ and Cr3+; temperature, 25 °C; shaking time, 60 min; adsorbent, 0.01 g; volume of adsorbate, 25 mL.
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