Abstract
Controlling water and air pollution by photocatalysts is an advanced technique and has aroused great interest. TiO2/hydroxyapatite (HAP) composites were successfully prepared via a one-step hydrothermal route that add a certain weight of tetrabutyl titanate to a mixed solution of Ca(NO3)2 and (NH4)2HPO4, and then put into a Teflon-lined autoclave for hydrothermal reaction. The surface morphology, chemical composition, crystalline structure, and optical property of the TiO2/HAP composites were characterized. The field emission-scanning electron microscopy (FE-SEM) observed the cube-like structure of crystal with the size of 10–20 μm. Energy dispersive X-ray spectrometry (EDS) and X-ray diffraction (XRD) demonstrated that Ti x Ca5−x (PO4)3(OH) was a unit of the crystal. UV–visible diffuse reflectance spectra show that the optical absorbance edge appeared at long wavelength (∼400 nm). Both higher temperature and longer time could contribute to the complete crystallization. Photocatalytic activity was evaluated by the degradation of rhodamine B (RhB) under visible light irradiation and found that the TiO2/HAP composites exhibited excellent photocatalytic activity. Therefore, these TiO2/HAP composites were expected to become one of advanced materials removing dyes from water.
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