Figure 5.

Effect of contact time on the adsorption of 10.0 μg mL⁻¹ Cu²⁺, Pb²⁺, and Cd²⁺ onto DTC-g-PE-DA@GB@PU (a) and 1.0 μg mL⁻¹ Pd²⁺, Pt⁴⁺, and Au³⁺ onto PE-DA@GB@PU (b). Other conditions: solution pH = 6 for DTC-g-PE-DA@GB@PU, solution pH = 0 for PE-DA@GB@PU; volume, 20 mL; adsorbent dose, 20 mg; temperature, 25 °C; (n = 3).