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The refluxing improved the Cu2+ dispersion in the TiO2 and formed effective Ti-O-Cu bonds. The impurity states due to the highly dispersed Cu2+ were presumed to trap the electrons in the conduction band of the TiO2 and prevent charge recombination of the electrons and holes. Consequently, the prolonged charge separation duration was suggested to enhance the photocatalytic activity of the Cu-doped TiO2. This enhancement was confirmed by the hydroxyl radical generation and organic compound degradation. The Ti-O-Cu bonds and electronic interaction between Cu and Ti should effectively promote the electron trapping. 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The refluxing improved the Cu2+ dispersion in the TiO2 and formed effective Ti-O-Cu bonds. The impurity states due to the highly dispersed Cu2+ were presumed to trap the electrons in the conduction band of the TiO2 and prevent charge recombination of the electrons and holes. Consequently, the prolonged charge separation duration was suggested to enhance the photocatalytic activity of the Cu-doped TiO2. This enhancement was confirmed by the hydroxyl radical generation and organic compound degradation. The Ti-O-Cu bonds and electronic interaction between Cu and Ti should effectively promote the electron trapping. 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