Mussel-inspired synthesis of polydopamine-functionalized calcium carbonate as reusable adsorbents for heavy metal ions

A new high-efficiency adsorbent (PDA-CaCO₃) is fabricated via simple thermal calcination ostracean shells and chemical modification with dopamine. It can be easily regenerated by low-cost reagents, and exhibited high adsorption capacity after multiple adsorption–desorption cycles.