Photocatalytic decomposition of acrylonitrile with N–F codoped TiO_2/SiO_2 under simulant solar light irradiation  

作　　者：Dandan Pang Lu Qiu Yunteng Wang Rongshu Zhu Feng Ouyang 

机构地区：[1]Shenzhen Graduate School,Harbin Institute of Technology

出　　处：《Journal of Environmental Sciences》2015年第7期169-178,共10页环境科学学报（英文版）

基　　金：financially supported by the Science and Technology Innovation Commission of Shenzhen Municipality, China (No. JCYJ20120613154128107)

摘　　要：The solid acid catalyst, N-F codoped Ti O2/Si O2 composite oxide was prepared by a sol-gel method using NH4 F as nitrogen and fluorine source. The prepared materials were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, X-ray photoelectron spectroscopy（XPS）, UV-Visible diffuse reflectance spectroscopy（UV-Vis）,ammonia adsorption and temperature-programmed desorption（NH3-TPD）, in situ Fourier transform infrared spectroscopy（FT-IR） and N2 physical adsorption isotherm. The photocatalytic activity of the catalyst for acrylonitrile degradation was investigated under simulant solar irradiation. The results showed that strong Lewis and Brnsted acid sites appear on the surface of the sample after N-F doping. Systematic investigation showed that the highest photocatalytic activity for acrylonitrile degradation was obtained for samples calcined at 450°C with molar ratio（NH4F to Ti） of 0.8. The degradation ratio of 71.5% was achieved with the prepared catalyst after 6-min irradiation, demonstrating the effectiveness of photocatalytic degradation of acrylonitrile with N-F codoped Ti O2/Si O2 composite oxide. The photocatalyst is promising for application under solar light irradiation.Moreover, the intermediates generated after irradiation were verified by gas chromatography-mass spectrometry（GC-MS） analysis and UV-Vis spectroscopy to be simple organic acids with lower toxicity, and the degradation pathway was also proposed for acrylonitrile degradation with the prepared catalyst.The solid acid catalyst, N-F codoped Ti O2/Si O2 composite oxide was prepared by a sol-gel method using NH4 F as nitrogen and fluorine source. The prepared materials were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, X-ray photoelectron spectroscopy（XPS）, UV-Visible diffuse reflectance spectroscopy（UV-Vis）,ammonia adsorption and temperature-programmed desorption（NH3-TPD）, in situ Fourier transform infrared spectroscopy（FT-IR） and N2 physical adsorption isotherm. The photocatalytic activity of the catalyst for acrylonitrile degradation was investigated under simulant solar irradiation. The results showed that strong Lewis and Brnsted acid sites appear on the surface of the sample after N-F doping. Systematic investigation showed that the highest photocatalytic activity for acrylonitrile degradation was obtained for samples calcined at 450°C with molar ratio（NH4F to Ti） of 0.8. The degradation ratio of 71.5% was achieved with the prepared catalyst after 6-min irradiation, demonstrating the effectiveness of photocatalytic degradation of acrylonitrile with N-F codoped Ti O2/Si O2 composite oxide. The photocatalyst is promising for application under solar light irradiation.Moreover, the intermediates generated after irradiation were verified by gas chromatography-mass spectrometry（GC-MS） analysis and UV-Vis spectroscopy to be simple organic acids with lower toxicity, and the degradation pathway was also proposed for acrylonitrile degradation with the prepared catalyst.

关 键 词：Photocatalytic activity ACRYLONITRILE In situ IR N-F codoping 

分 类 号：O643.3[理学—物理化学] X505[理学—化学]