Abstract
In this study, tin dioxide (SnO2) modified F-TiO2/SiO2 catalysts (F-TiO2/SnO2/SiO2) was prepared by two steps method. The prepared powders were characterized by scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), Brunauer-Ernmett-Teller (BET), ultraviolet-visible absorption spectroscopy (UV-vis), photoluminescence spectroscopy (PL). The photocatalytic activities was evaluated by degradation ratio of acrylonitrile, which reached 74.0%, that was higher than that of F-TiO2/SiO2 catalysts 60.5 % after irradiation under simulated sunlight for 6 min. A series of characterization showed that the SnO2 modified photocatalysts had small crystal size, large specific surface area, and were easily dispersed uniformly in the reaction system. The photoluminescence (PL) spectra were also slightly weakened, implying that SnO2 modification well inhibited the recombination of electron hole pairs. A red shift of absorption edge occurred implying that the utilization of visible light was effective.
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