Adsorption of heavy metal ions using hierarchical CaCO3-maltose meso/macroporous hybrid materials: Adsorption isotherms and kinetic studies

► Hierarchical CaCO3-maltose meso/macroporous materials are firstly synthesized. ► The preparation method is simple and friendly environment. ► Hierarchical CaCO3-maltose materials have high removal capacities of metal ions. ► Hierarchical CaCO3-maltose materials could decontaminate of trace metal ions.