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Optimization of cerium doping of TiO2 for photocatalytic reduction of CO2 and photocatalytic decomposition of N2O

  • Original Paper: Sol-gel and hybrid materials for catalytic, photoelectrochemical and sensor applications
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Abstract

The cerium-doped TiO2 photocatalysts (0–0.8 mol% Ce) were prepared by using a sol–gel method. Textural, structural, optical and electronic properties of Ce/TiO2 photocatalysts were characterized in detail by using nitrogen physisorption, powder X-ray diffraction, diffuse reflectance UV–Vis spectroscopy and contact potential difference measurements. It was proved that increasing amount of cerium ions in TiO2 (1) decreased the anatase crystallite size, which corresponded to the increase in specific surface area of the photocatalysts, and (2) decreased the absorption edge (shifting the spectral response toward the visible light region). The prepared photocatalysts were tested for CO2 photocatalytic reduction in a stirred batch annular reactor, and methane was a main product. The photocatalytic decomposition of nitrous oxide was carried out in batch reactor with circulation, and only oxygen and nitrogen were detected as reaction products. It was found out that the energies of electrons and holes played the key role in both photocatalytic reactions and can be markedly affected by doping of TiO2 by cerium.

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Acknowledgments

This work was supported by the Grant Agency of the Czech Republic (projects reg. Nos. 14-35327J and 14-23274S). Authors also thank to the support of the project SP2015/125 and projects in National Feasibility Program I LO1404 “TUCENET” and LO1208 “TEWEP” from Ministry of Education, Youth and Sports of the Czech Republic.

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Authors and Affiliations

  1. Institute of Environmental Technology, VŠB - Technical University of Ostrava, 17 listopadu 15/2172, 708 33, Ostrava – Poruba, Czech Republic

    Kamila Kočí, Lenka Matějová, Nela Ambrožová, Marcel Šihor, Ivana Troppová & Lucie Obalová

  2. Faculty of Metallurgy and Material Engineering, VŠB - Technical University of Ostrava, 17 listopadu 15/2172, 708 33, Ostrava – Poruba, Czech Republic

    Kamila Kočí & Lucie Obalová

  3. Energy Units for Utilization of Non Traditional Energy Sources, VŠB - Technical University of Ostrava, 17 listopadu 15/2172, 708 33, Ostrava – Poruba, Czech Republic

    Kamila Kočí

  4. Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 95, 532 10, Pardubice, Czech Republic

    Libor Čapek

  5. Jagiellonian University, Ingardena 3, 30-060, Kraków, Poland

    Andrzej Kotarba & Piotr Kustrowski

  6. Institute of Physics of the ASCR, v.v.i, Na Slovance 2, 182 21, Prague 8, Czech Republic

    Alice Hospodková

Authors
  1. Kamila Kočí
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  2. Lenka Matějová
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  3. Nela Ambrožová
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  4. Marcel Šihor
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  5. Ivana Troppová
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  6. Libor Čapek
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  7. Andrzej Kotarba
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  8. Piotr Kustrowski
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  9. Alice Hospodková
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  10. Lucie Obalová
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Corresponding author

Correspondence to Kamila Kočí.

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Kočí, K., Matějová, L., Ambrožová, N. et al. Optimization of cerium doping of TiO2 for photocatalytic reduction of CO2 and photocatalytic decomposition of N2O. J Sol-Gel Sci Technol 78, 550–558 (2016). https://doi.org/10.1007/s10971-016-3994-3

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  • DOI: https://doi.org/10.1007/s10971-016-3994-3

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