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Preparation and Adsorption Property of Nano-Rods Hydroxyapatite Using Cationic Surfactant Templates

Nano-rods hydroxyapatite (HA) was synthesized by hydrothermal method using Ca(NO3)2·4H2O and H3PO4 as precursors and cationic surfactant (CTAB) as a template. The effect of pH value and reaction temperature on the phase and morphology of HA were investigated. HA samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). It was found that high pH values resulted in high purity of HA. HA morphology changed from irregular round shape to nano-rod shape with the increase of the reaction temperature from 80°C to 120°C. The prepared HA was utilized as adsorbent to remove copper ion from aqueous solution. The adsorption results showed that nano-rod HA had a rapid Cu2+ adsorption rate and good removal efficiency (>99%).