کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
146938 | 456383 | 2014 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Fluorine promoted and silica supported TiO2 for photocatalytic decomposition of acrylonitrile under simulant solar light irradiation Fluorine promoted and silica supported TiO2 for photocatalytic decomposition of acrylonitrile under simulant solar light irradiation](/preview/png/146938.png)
• F doped samples were obtained by a simple sol–gel method.
• Bronsted and Lewis sites are observed on the surface of the samples by in situ IR.
• The number and strength of surface acid sites are increased due to F doping.
• The F doped samples show superior photocatalytic activity.
The F doped TiO2/SiO2 composition oxides were prepared by sol–gel method using HF solution as fluorine source. The prepared powders were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET), ultraviolet–visible absorption spectroscopy (UV–Vis), photoluminescence spectroscopy (PL), Fourier transform infrared spectroscopy (FT-IR) and ammonia adsorption and temperature-programmed desorption (NH3-TPD). The photocatalytic activities of the powders for acrylonitrile degradation have been inspected. The results show that the presence of SiO2 as a support for TiO2 loading benefits the formation of the nanoparticles with a large surface. In situ IR and NH3-TPD investigation shows that the higher photocatalytic activity for F doped samples is attributed to the increase of number and strength of surface acid sites. The highest photcatalytic activity for acrylonitrile degradation is obtained for a sample calcined at 450 °C with molar ratio (HF to Ti) of 1.1 and 36% TiO2 loading. The degradation ratio of acrylonitrile can reach to 66% under simulant solar light for 6 min, indicating the effectiveness of photocatalytic degradation acrylonitrile using F doped TiO2/SiO2 composite oxide.
Journal: Chemical Engineering Journal - Volume 258, 15 December 2014, Pages 43–50