超强酸化Fe_2O_3-TiO_2-N在可见光下降解丙烯酸的研究（英文）

Degradation Effect of Super Acid Modified Fe_2O_3-TiO_2-N on Acrylic Acid under Visible Light

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%。

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.