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Journal of Sol-Gel Science and Technology

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07.04.2020 | Original Paper: Nano- and macroporous materials (aerogels, xerogels, cryogels, etc.)

Novel modified nonalkoxide sol–gel synthesis of multiphase high surface area TiO₂ aerogels for photocatalysis

verfasst von: Joseane C. Bernardes, Geneviève K. Pinheiro, Daliana Muller, Eloah Latocheski, Josiel B. Domingos, Carlos R. Rambo

Erschienen in: Journal of Sol-Gel Science and Technology | Ausgabe 2/2020

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Abstract

Multiphase TiO₂ aerogels were synthesized through a simple, environment friendly sol–gel route. TiCl₃ was used as nonalkoxide precursor with ethanol as solvent. The formed alcogels were converted into aerogels by CO₂ supercritical drying. The results revealed that the increase in TiCl₃ concentration leads to the decay of the gelation time, possibly due to the availability of Ti⁺⁴ ions in the medium that led to the formation of the interconnected gel network more easily. The aerogels produced from 0.75 M TiCl₃ and calcined at 450 °C exhibited the three main crystalline phases of titania (anatase, brookite, and rutile) and a specific surface area of 124 m²/g. Through transmission electron microscopy, it was possible to visualize the morphology of the nanostructured aerogels, comprised of a network of nanoparticles with sizes between 5 and 15 nm. The combination of high specific surface area, particle size in nanometer scale, and crystallinity of the material allowed greater photocatalytic reduction of 4-nitrophenol compared with commercial Degussa P-25.

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Titel: Novel modified nonalkoxide sol–gel synthesis of multiphase high surface area TiO2 aerogels for photocatalysis
verfasst von: Joseane C. Bernardes
Geneviève K. Pinheiro
Daliana Muller
Eloah Latocheski
Josiel B. Domingos
Carlos R. Rambo
Publikationsdatum: 07.04.2020
Verlag: Springer US
Erschienen in: Journal of Sol-Gel Science and Technology / Ausgabe 2/2020
Print ISSN: 0928-0707
Elektronische ISSN: 1573-4846
DOI: https://doi.org/10.1007/s10971-020-05286-z

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