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Synthesis, characterization, and catalytic activity of FeTiO3/TiO2 for photodegradation of organic pollutants with visible light

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Abstract

High-purity ilmenite, FeTiO3, was prepared by the sol–gel method and calcination under nitrogen atmosphere. Several FeTiO3/TiO2 catalysts were prepared by the impregnation method using ilmenite and titania, both synthesized by the sol–gel method with ethanol and acetic acid. FeTiO3/TiO2 photocatalysts exhibited significant absorption in the ultraviolet (UV) region with an energy bandgap between 2.9 and 3.1 eV. These materials are more active than titania (Degussa P25) for degradation of Orange G and 4-chlorophenol under illumination from a visible-light lamp. This effect may be attributed to the formation of a heterojunction at the point of contact between FeTiO3 and TiO2 particles. However, 4-chlorophenol is mineralized via formation of hydroquinone and benzoquinone, indicating that when illuminated with a solar emulator lamp, the materials did not generate enough HO· radicals to promote formation of benzenetriol and catechol.

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Acknowledgments

The authors would like to thank CONACYT for financial support through projects FOINS/75/2012 Fotosíntesis Artificial, CNPq México-Brasil Nanotecnologías 2011-174247, CB-168730, ProyectoRedes 2012 clave 194451, CB-2008-01-103532 and Ph.D. Scholarship No. 87101. We also thank the Universidad Autónoma de Nuevo León for its support through projects PAICYT-UANL-2011–2012.

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Authors and Affiliations

  1. Departamento de Ecomateriales y Energía, Facultad de Ingeniería Civil, Universidad Autónoma de Nuevo León, Ciudad Universitaria, San Nicolás de los Garza, N.L., C.P. 66455, Mexico

    María E. Zarazúa-Morín, Leticia M. Torres-Martínez & Isaías Juárez-Ramírez

  2. Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Manuel Nava # 6, San Luis Potosí, S.L.P., C.P. 78290, Mexico

    Edgar Moctezuma & Brenda B. Zermeño

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  1. María E. Zarazúa-Morín
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  2. Leticia M. Torres-Martínez
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  3. Edgar Moctezuma
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  4. Isaías Juárez-Ramírez
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Correspondence to Leticia M. Torres-Martínez.

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Zarazúa-Morín, M.E., Torres-Martínez, L.M., Moctezuma, E. et al. Synthesis, characterization, and catalytic activity of FeTiO3/TiO2 for photodegradation of organic pollutants with visible light. Res Chem Intermed 42, 1029–1043 (2016). https://doi.org/10.1007/s11164-015-2071-9

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  • DOI: https://doi.org/10.1007/s11164-015-2071-9

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