FENG Qiming;DONG Faqin;WANG Weiqing
. 2012, 43(15): 2091-2094.
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With sol-gel method, La3+-doped TiO2 sol was synthedized using tetrabutyl titanate and lanthanum nitrate as main raw materials, anhydrous ethanol as the solvent, glacial acetic acid as the inhibitor, concentrated nitric acid as the catalyst .The gel was calcined for 3h at different temperature, and then TiO2 powder with different amounts of La3+-doped was obtained. All samples were characterized by XRD, and the photodegradation effect of methyl orange on La3+-doped TiO2 was studied using UV as light source. Water-based magnetic fluids Fe3O4 was prepared by chemical coprecipitation method, La3+-doped TiO2 with different mass fraction of Fe3O4 were prepared by La3+-doped TiO2 compounding with magnetic fluids Fe3O4, and the photodegradation effect of methyl orange on La3+-doped TiO2 with different mass fraction of Fe3O4 and magnetic separation recovery rate were studied. The results show that the amount of La3+-doped and the calcine temperature had impacts on the crystal phase of TiO2, relative content of different crystal phase TiO2 and the photodegradation effect on methyl orange, the photocatalytic activity of La3+-doped TiO2 is superior to the pure TiO2, and the photocatalytic activity of La3+-doped TiO2 is highest in all samples when the amount of La3+-doped was 2.0%, heat treatment temperature was 450℃. When the mass fraction of Fe3O4 was 10%, the photodegradation effect of methyl orange on La3+-doped TiO2 with Fe3O4 increased rapidly with degradation time increasing, reached to 99.4% when degradation time was 8 h, and the magnetic separation recovery rate reached to 97.39%.