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LiF was used to modify the photocatalytic property of TiO2 powders considering the special functionality of Li and F ions.Two series of samples were prepared.Series one is the hydrothermal treatment of directly mixed TiO2 and LiF powders and series two is the hydrothermal treatment of TiO2 powder and LiF solution with different mole ratios.The samples were analyzed by X-ray diffraction (XRD),UV-Vis spectrometer and X-ray photoelectron spectrometer (XPS).XRD patterns demonstrated that the samples of series one is a mixture of TiO2 and LiF,while only TiO2 was found in the samples of series two.XPS results showed that Fions exist in both two series of samples,no Li ion was detected due to the measuring limitation of XPS.Photocatalytic property of the samples was tested by depredating of methyl blue.The samples of series one displayed strong adsorbability while the samples of series two had improved photocatalytic activity under visible light.The best photocatalytic activity was realized with LiF and TiO2 molar ratio of 1:1,the degradation rate is nearly eighty percent after 250 minutes.Possible modifying mechanism was supposed based on the experimental results.