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The time needed for gelation of the systems was significantlyreduced by ultrasonic irradiation. The doped sulfate was observed by FTIR and XPSmeasurements. Some sulfate ions remained in the TiO2 even after heating at 300−600 °C.The UV and visible photocatalytic activities of the samples were confirmed by thedegradation of trichloroethylene (TCE). The activity of the photocatalyst samples duringthe UV irradiation strongly depended on their crystallinities rather than their specificsurface areas, i.e., adsorption ability. The degradation rate during the visible irradiationdepended on both the adsorption ability and visible absorption of the photocatalystsamples. 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The time needed for gelation of the systems was significantly reduced by ultrasonic irradiation. The doped sulfate was observed by FTIR and XPS measurements. Some sulfate ions remained in the TiO2 even after heating at 300-600 degrees C. The UV and visible photocatalytic activities of the samples were confirmed by the degradation of trichloroethylene (TCE). The activity of the photocatalyst samples during the UV irradiation strongly depended on their crystallinities rather than their specific surface areas, i.e., adsorption ability. The degradation rate during the visible irradiation depended on both the adsorption ability and visible absorption of the photocatalyst samples. 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