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Open AccessArticle

Design of Multifunctional Titania-Based Photocatalysts by Controlled Redox Reactions

1
CICECO–Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal
2
CICECO–Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
3
Departamento de Química Inorgánica, Cristalografía y Mineralogía (Unidad Asociada al ICP-CSIC), Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos, 29071 Málaga, Spain
*
Author to whom correspondence should be addressed.
Materials 2020, 13(3), 758; https://doi.org/10.3390/ma13030758
Received: 8 January 2020 / Revised: 27 January 2020 / Accepted: 5 February 2020 / Published: 7 February 2020
This work aims at the preparation of multifunctional titania-based photocatalysts with inherent capabilities for thermal co-activation and stabilisation of anatase polymorph, by designing the phase composition and microstructure of rutile-silicon carbide mixture. The processing involved a conventional solid state route, including partial pre-reduction of rutile by SiC in inert Ar atmosphere, followed by post-oxidation in air. The impacts of processing conditions on the phase composition and photocatalytic activity were evaluated using Taguchi planning. The XRD studies confirmed the presence of rutile/anatase mixtures in the post-oxidised samples. The results emphasise that pre-reduction and post-oxidation temperatures are critical in defining the phase composition, while post-oxidation time is relevant for the photocatalytic performance. Microstructural studies revealed the formation of core-shell particles, which can suppress the photocatalytic activity. The highest apparent reaction rate of the photodegradation of methylene blue was observed for the sample pre-reduced in Ar at 1300 °C for 5 h and then calcined in air at 400 °C for 25 h. Though its performance was ~1.6-times lower than that for the same amount of nanostructured industrial P25 photocatalyst, it was achieved in the material possessing 2–3 times lower surface area and containing ~50 mol% of SiO2 and SiC, thus demonstrating excellent prospects for further improvements. View Full-Text
Keywords: photocatalysis; TiO2; anatase; silicon carbide; Taguchi plan; redox reaction photocatalysis; TiO2; anatase; silicon carbide; Taguchi plan; redox reaction
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MDPI and ACS Style

Lopes, D.; Daniel-da-Silva, A.L.; Sarabando, A.R.; Arias-Serrano, B.I.; Rodríguez-Aguado, E.; Rodríguez-Castellón, E.; Trindade, T.; Frade, J.R.; Kovalevsky, A.V. Design of Multifunctional Titania-Based Photocatalysts by Controlled Redox Reactions. Materials 2020, 13, 758.

AMA Style

Lopes D, Daniel-da-Silva AL, Sarabando AR, Arias-Serrano BI, Rodríguez-Aguado E, Rodríguez-Castellón E, Trindade T, Frade JR, Kovalevsky AV. Design of Multifunctional Titania-Based Photocatalysts by Controlled Redox Reactions. Materials. 2020; 13(3):758.

Chicago/Turabian Style

Lopes, Diogo; Daniel-da-Silva, Ana L.; Sarabando, Artur R.; Arias-Serrano, Blanca I.; Rodríguez-Aguado, Elena; Rodríguez-Castellón, Enrique; Trindade, Tito; Frade, Jorge R.; Kovalevsky, Andrei V. 2020. "Design of Multifunctional Titania-Based Photocatalysts by Controlled Redox Reactions" Materials 13, no. 3: 758.

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