Fabrication and Lead Ion Removal Property of Magnetic Hydroxyapatite Composite with Hierarchically Urchin-like Microstructure
The hierarchically urchin-like magnetic hydroxyapatite (HAp)/Fe3O4 composites were hydrothermally fabricated and were used for the removal of Pb (II) from aqueous solutions. The morphology, composition and properties of the magnetic HAp/Fe3O4 composites were fully characterized and investigated. The results showed that the HAp/Fe3O4 composites had a 3D urchin-like hierarchical structure with Fe3O4 nanoparticles dispersed among the building units. These urchin-like composites had high surface area and good magnetic responsibility. The equilibrium removal process of Pb (II) by the composites was correlated well with the Langmuir model, resulting in the maximum adsorption capacity of 223.71 mg/g. The high adsorption capacity and good magnetic responsibility suggest that the multifunctional composites have great potentials for heavy metal ion removal.