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A detailed insight into the preparation of nanocrystalline TiO2 powders in supercritical carbon dioxide

  • Ceramics
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Abstract

This work reports detailed investigations for the preparation of nanostructured titania powders by a solvent-free sol–gel-derived process, operated in supercritical CO2 (SC-CO2) at high pressures (10–30 MPa) and large range of temperatures (373–823 K). Depending on the processing temperature, the reaction between Ti(OiPr)4 and water performed in a single supercritical phase led to the formation of either amorphous (Ti(OH)4—titanium hydroxide) or crystalline (TiO2—titanium dioxide) nanostructured particles. Crystalline (anatase) mesoporous powders with high specific surface area were obtained directly in CO2 solvent under supercritical conditions at temperatures as low as 523 K. The effect of hydrodynamic key process parameters such as stirring and water injection rate on both powder morphology and aggregation degree was also investigated in details. The optimized TiO2 anatase powders exhibited attractive photocatalytic activity, with high potential for the degradation of water pollutants.

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Acknowledgements

The authors would like to thank Dr. Sébastien PAPET for his contribution to amorphous powder preparation and characterizations, M. Mickael GARCES and M. Damien AVRIL for their work on crystalline TiO2 particles and Mlle Géraldine DIDERON for photocatalytic tests.

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Authors and Affiliations

  1. CEA, DEN, Marcoule, 30207, Bagnols sur Cèze, France

    A. Hertz, J.-C. Ruiz & F. Charton

  2. Institut Européen des Membranes, ENSCM-UM-CNRS, UMR5635, Université de Montpellier, Place Eugène Bataillon, 34095, Montpellier Cedex 5, France

    M. Drobek, C. Guizard & A. Julbe

  3. CEA, DEN, Saclay, 91191, Gif-sur-Yvette Cedex, France

    S. Sarrade

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  1. A. Hertz
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Correspondence to A. Hertz.

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Hertz, A., Drobek, M., Ruiz, JC. et al. A detailed insight into the preparation of nanocrystalline TiO2 powders in supercritical carbon dioxide. J Mater Sci 52, 12635–12652 (2017). https://doi.org/10.1007/s10853-017-1398-6

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  • DOI: https://doi.org/10.1007/s10853-017-1398-6

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