Degradation Effect of Super Acid Modified Fe2O3-TiO2-N on Acrylic Acid under Visible Light

doi:10.15541/jim20140234

Abstract

Abstract:

Super acid modified Fe₂O₃-TiO₂-N was prepared by hydrolysis precipitation method and sulfuric acid impregnation method. X-ray diffraction (XRD) showed that the catalysts were anatase, Fe₂O₃ were highly decentralized in the catalysts with amorphous form, and modification of SO₄^2- inhibited grain growth. Ultraviolet-visible spectra (UV-Vis) showed that Fe and N co-doping made the visible light absorption to the red shift, and sulfuric acid impregnation treatment made the light absorption to the blue shift. Diffuse reflectance Fourier transform infrared (DRIFT-IR) spectra showed that sulfuric acid impregnation can improve the surface acidity of catalysts. X-ray photoelectron spectra (XPS) showed that the valence of S was +6 in the catalysts. Its photocatalytic activity on the degradation of acrylic acid under visible light was studied. The one hour degradation rate of super acid modified Fe₂O₃-TiO₂-N catalyst under visible light was improved 57% than that of the N-doping sample under the same condition.

Key words: co-doping, degradation, visible light, photocatalytic

CLC Number:

TQ174

HAN Zhi-Yue, DU Zhi-Ming, ZHANG Ying-Hao, ZHAO Lin-Shuang, CONG Xiao-Min. Degradation Effect of Super Acid Modified Fe₂O₃-TiO₂-N on Acrylic Acid under Visible Light[J]. Journal of Inorganic Materials, 2014, 29(10): 1110-1114.

Figures/Tables 11

Fig. 1 Catalytic reactor system for degradation of acrylic acid with visible lamp irradiation

Fig. 2 XRD patterns of the TiO2-N, Fe2O3-TiO2-N and Fe2O3- TiO2-N-SO42- powders

Fig. 3 XRD patterns of samples treated by sulfuric acid and calcined at different temperatures

Fig. 4 DRIFT spectroscopy associated with NH3 adsorption on catalysis with different concentrations of H2SO4

Fig. 5 S XPS patterns of Fe2O3-TiO2-N-SO42-

Fig. 6 N XPS patterns of Fe2O3-TiO2-N-SO42-

Fig. 7 Ti XPS patterns of Fe2O3-TiO2-N-SO42-

Fig. 8 UV-Vis absorption of different samples

Fig. 9 Degradation rate of acrylic acid with different catalysts

Fig. 10 Degradation rate of acrylic acid with different concentrations of sulfuric acid

Fig. 11 Degradation rate of acrylic acid with different calcination temperatures

References 11

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Degradation Effect of Super Acid Modified Fe₂O₃-TiO₂-N on Acrylic Acid under Visible Light

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