Effect of Tin Dioxide Modified F-TiO2/SiO2 Nano-Powder Catalysts on Photocatalytic Degradation of Acrylonitrile

Resumo

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.