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Journal of Sol-Gel Science and Technology

, Volume 84, Issue 1, pp 158–168 | Cite as

Investigation of low Ce amount doped-TiO2 prepared by using pressurized fluids in photocatalytic N2O decomposition and CO2 reduction

  • Lenka MatějováEmail author
  • Marcel Šihor
  • Jaroslav Lang
  • Ivana Troppová
  • Nela Ambrožová
  • Martin Reli
  • Tereza Brunátová
  • Libor Čapek
  • Andrzej Kotarba
  • Kamila Kočí
Original Paper: Sol-gel and hybrid materials for catalytic, photoelectrochemical and sensor applications

Abstract

Ce doped TiO2 anatase/brookite composites with 0.6–5.5 wt% of Ce, as well as parent TiO2 anatase/brookite were synthesized to be investigated in two environmentally-beneficial reactions, the photocatalytic decomposition of N2O and the photocatalytic reduction of CO2. Composites were prepared unconventionally, by using sol–gel method combined with the processing by pressurized hot fluids (in the sequence water/methanol/water). The physicochemical and electronic properties of all synthesized composites were characterized by organic elementary analysis, nitrogen physisorption, powder X-ray diffraction, X-ray fluorescence spectroscopy, diffuse reflectance UV-vis spectroscopy and work function measurements. It was revealed that all composites show comparable textural properties, crystallite size, as well as optical properties, except for the 5.5 wt% Ce/TiO2 composite which showed significantly lowered band gap energy due to the significantly higher population of Ce. Concerning the composite structural properties, the addition of different amounts of Ce in the range of 0.6–5.5 wt% affected markedly the phase composition of composites, namely the anatase-to-brokite weight ratio. Concerning the photocatalytic tests the 5.5 wt% Ce/TiO2 composite showed the highest photocatalytic performance. The highest photocatalytic performance of the 5.5 wt% Ce/TiO2 composite can be attributed to the lowest composite work function which is affected by both the amount of Ce, as well as the phase composition.

Graphical Abstract

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Keywords

Cerium Anatase/Brookite Pressurized hot fluid Photocatalysis Work function 

Notes

Acknowledgements

The financial support of the Grant Agency of the Czech Republic (Project Reg. No. 14-23274S) is gratefully acknowledged. Authors also thank to the support of the “National Feasibility Program I” (Project LO1208 “TEWEP”) from The Ministry of Education, Youth, and Sports of the Czech Republic.

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no competing interests.

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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  • Lenka Matějová
    • 1
    Email author
  • Marcel Šihor
    • 1
  • Jaroslav Lang
    • 1
  • Ivana Troppová
    • 1
  • Nela Ambrožová
    • 1
  • Martin Reli
    • 1
  • Tereza Brunátová
    • 2
  • Libor Čapek
    • 3
  • Andrzej Kotarba
    • 4
  • Kamila Kočí
    • 1
  1. 1.Institute of Environmental TechnologyVŠB-Technical University of OstravaOstrava-PorubaCzech Republic
  2. 2.Department of Condensed Matter Physics, Faculty of Mathematics and PhysicsCharles University in PraguePrague 2Czech Republic
  3. 3.Department of Physical Chemistry, Faculty of Chemical TechnologyUniversity of PardubicePardubiceCzech Republic
  4. 4.Faculty of ChemistryJagiellonian UniversityKrakowPoland

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