Abstract: CaTi2O4(OH)2 powders with different ultraviolet photocatalytic properties were prepared by hydrothermal method using n-butyl titanate and anhydrous calcium chloride as raw materials.The phase structure, micro-morphologies, optical absorption properties and band gap width of as-prepared powders were characterized by X-Ray Diffraction(XRD), Field Emission Scanning Electron Microscope(FESEM) and UV-Vis absorption spectra(UV-Vis).The influence of different hydrothermal temperature on the phase structure, microstructure, crystal growth characteristics and ultraviolet photocatalytic properties of CaTi2O4(OH)2 were investigated.The results show that the pure CaTi2O4(OH)2 phase can be obtained at 160-200 ℃ for 36 h.The morphology of the powder from the sheet and pellet stack to develop into a complete sheet morphology process with the hydrothermal reaction temperature improved, and when the hydrothermal reaction temperature at 200 ℃, it can be found the film accumulation.The powder has the highest crystallinity when the temperature is 180 ℃, and the photocatalytic efficiency of rhodamine B is the best under UV-visible light for 5 h.

Key words: CaTi2O4(OH)2 powders with different ultraviolet photocatalytic properties were prepared by hydrothermal method using n-butyl titanate and anhydrous calcium chloride as raw materials.The phase structure, micro-morphologies, optical absorption properties and band gap width of as-prepared powders were characterized by X-Ray Diffraction(XRD), Field Emission Scanning Electron Microscope(FESEM) and UV-Vis absorption spectra(UV-Vis).The influence of different hydrothermal temperature on the phase structure, microstructure, crystal growth characteristics and ultraviolet photocatalytic properties of CaTi2O4(OH)2 were investigated.The results show that the pure CaTi2O4(OH)2 phase can be obtained at 160-200 ℃ for 36 h.The morphology of the powder from the sheet and pellet stack to develop into a complete sheet morphology process with the hydrothermal reaction temperature improved, and when the hydrothermal reaction temperature at 200 ℃, it can be found the film accumulation.The powder has the highest crystallinity when the temperature is 180 ℃, and the photocatalytic efficiency of rhodamine B is the best under UV-visible light for 5 h.