K₂CO₃-Activated Pomelo Peels as a High-Performance Adsorbent for Removal of Cu(II): Preparation, Characterization, and Adsorption Studies

Figure 5

Zeta potential of PAC850-1-3 and the effect of pH on the adsorption capacity of Cu(II) (PACs dose: 0.0500 g; temperature: 30°C; pH: 2, 3, 4, 5; concentration of Cu(II): 100 mg/l). Error bars indicated standard deviation of three replicated experiments.