Figure 8

SEM elemental mapping images of (a,c) L-Cyst-Fe₃O₄ NPs; (b) Pb²⁺ loaded L-Cyst-Fe₃O₄ NPs (Lead in yellow); (d) Cr⁶⁺ loaded L-Cyst-Fe₃O₄ NPs (Chromium in cyan color) and (e) Demonstration of exhausted L-Cyst-Fe₃O₄ NPs separation from aqueous system.