超强酸化Fe2O3-TiO2-N在可见光下降解丙烯酸的研究

doi:10.15541/jim20140234

摘要/Abstract

摘要：

通过水解沉淀法和H₂SO₄浸渍干凝胶的方法, 制备了具有可见光活性的超强酸化的Fe₂O₃-TiO₂-N光催化剂。XRD测试结果表明, 所制得的催化剂为锐钛矿型, 且H₂SO₄处理显著抑制了晶粒的长大。UV-Vis分析表明, N、Fe掺杂样品相比纯TiO₂有一定的红移, 而浸渍硫酸的处理使样品的光吸收蓝移。原位红外的测试表明, H₂SO₄浸渍提高了催化剂的表面酸性, XPS测试说明了S以+6价存在于催化剂中。对丙烯酸的光降解试验表明, 相比单独N掺杂的TiO₂, 所得的超强酸化的Fe、N共掺杂光催化剂活性提高了57%。

关键词: 共掺杂, 降解, 可见光, 光催化

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

中图分类号:

TQ174

韩志跃，杜志明，张英豪，赵林双，丛晓民. 超强酸化Fe₂O₃-TiO₂-N在可见光下降解丙烯酸的研究[J]. 无机材料学报, 2014, 29(10): 1110-1114.

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.

图/表 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

参考文献 11

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超强酸化Fe₂O₃-TiO₂-N在可见光下降解丙烯酸的研究

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

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