Nanosized TiO2-SiO2 supported catalysts were prepared by low-temperature hydrothermal method.These catalysts were characterized by BET,XRD,and employed to degrade methylene blue under UV-irradiation.The results show t...Nanosized TiO2-SiO2 supported catalysts were prepared by low-temperature hydrothermal method.These catalysts were characterized by BET,XRD,and employed to degrade methylene blue under UV-irradiation.The results show that hydrothermal time and TiO2 content have critical effect on performance of the catalysts.The catalyst prepared with TiO2-SiO2 ratio of 7:3 and hydrothermal time of 5 h exhibited the highest photoactivity of 0.0307 min-1,which was 2 times higher than that of pure TiO2.This strongly indicated that the photocatalytic activity of titania/silica mixed materials depends on the adsorption ability of catalyst and the photocatalytic activity of the titania,and there is an optimal ratio of Ti : Si,too high or low Ti : Si ratio will lower the photodegradation ability of the catalysts.展开更多
文摘Nanosized TiO2-SiO2 supported catalysts were prepared by low-temperature hydrothermal method.These catalysts were characterized by BET,XRD,and employed to degrade methylene blue under UV-irradiation.The results show that hydrothermal time and TiO2 content have critical effect on performance of the catalysts.The catalyst prepared with TiO2-SiO2 ratio of 7:3 and hydrothermal time of 5 h exhibited the highest photoactivity of 0.0307 min-1,which was 2 times higher than that of pure TiO2.This strongly indicated that the photocatalytic activity of titania/silica mixed materials depends on the adsorption ability of catalyst and the photocatalytic activity of the titania,and there is an optimal ratio of Ti : Si,too high or low Ti : Si ratio will lower the photodegradation ability of the catalysts.
