Fig. 11. Impacts of metal ions' type (a) Cr6+ to Cu2+ ratio, (b) pH, (c) adsorption time, and (d) on the metal ions' adsorption efficiency (composite tablet adsorbed with 10 mg L−1 concentration under 40 °C temperature for 600 min in 4.5 pH, 5 mL of metal ion aqueous solution (1 mg L−1), 130 rpm), adapted with permission from ref. 104, copyright, Elsevier, 2021.
