Recovery of Palladium from Acidic Solution Using Polyethylenimine-Crosslinked Calcium Silicate Hydrate Derived from Oyster Shell Waste: Adsorption and Mechanisms

Figure 8

Repeated adsorption-desorption of Pd(II) on PEI-CSH in a batch process (adsorption conditions: pH 2; volume of solution, 30 mL; mass of adsorbent, 60 mg; initial Pd(II) concentration, 200 mg/L, desorption conditions: pH 2; volume of 0.01 M thiourea solution, 30 mL; and mass of Pd(II)-loaded adsorbent, 60 mg).