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Influence of Post-Synthesis Modifications of Ti1−x Zr x O2 Nanocrystallites on Their Photocatalytic Activity for Toluene and Methylcyclohexane Degradation

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The modification of the structural and surface characteristics of Ti1−x Zr x O2 nanocrystallites by postsynthesis treatments is revealed as an effective way to enhance their photocatalytic activity. Starting with the same batch of mixed oxide prepared from reverse microemulsions, different photocatalysts have been obtained by either solvothermal treatment, calcination or a combination of both. Extensive physicochemical characterization of the resulting materials shows that solvothermally treated oxides present lower crystallite size and larger surface area, although without previous calcination these samples appear to have a higher degree of structural disorder. These differences are sharply reflected in the changes in photocatalytic activity for the removal of methylcyclohexane (MCH) and toluene vapours at relatively high concentrations. Thus, the best performance for MCH elimination is obtained with the photocatalysts prepared by calcination and subsequent solvothermal treatment. Following this procedure, the resulting Ti1−x Zr x O2 material presents larger surface area and high Zr surface concentration with minimal disturbance of the anatase structure. In contrast, for toluene photooxidation, the solvothermally prepared sample shows improved performance, most likely due to its larger surface area, which contributes to hinder deactivation.

Keywords: Hydrothermal Synthesis; Photocatalysis; TiO2; VOCs; Zr-Doped TiO2

Document Type: Research Article

Affiliations: 1: Repsol Technology Centre, Autovía de Extremadura, s/n. 28935 Móstoles, Madrid, Spain 2: Photoactivated Processes Unit, IMDEA Energy Institute, Parque Tecnológico de Móstoles, Avda. Ramón de la Sagra, 3, 28935 Móstoles, Madrid, Spain 3: Instituto de Catálisis y Petroleoquímica, CSIC, Marie Curie, 2, Cantoblanco, 28049 Madrid, Spain

Publication date: December 1, 2019

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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