Eco-Friendly Colloidal Aqueous Sol-Gel Process for TiO2 Synthesis: The Peptization Method to Obtain Crystalline and Photoactive Materials at Low Temperature

Mahy, Julien; Lejeune, Louise; Haynes, Tommy; Lambert, Stéphanie; Marcilli, Raphael Henrique Marques; Fustin, Charles-André; Hermans, Sophie

doi:10.3390/catal11070768

Article (Scientific journals)

Eco-Friendly Colloidal Aqueous Sol-Gel Process for TiO2 Synthesis: The Peptization Method to Obtain Crystalline and Photoactive Materials at Low Temperature

Mahy, Julien; Lejeune, Louise; Haynes, Tommy et al.

2021 • In Catalysts, 11, p. 768

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https://hdl.handle.net/2268/261396

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10.3390/catal11070768

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Keywords :

TiO2; Photocatalysis; Sol-Gel synthesis; Peptization; Doping; Pollutant degradation; Mild temperature

Abstract :

[en] This work reviews an eco-friendly process for producing TiO2 via colloidal aqueous sol–gel synthesis, resulting in crystalline materials without a calcination step. Three types of colloidal aqueous TiO2 are reviewed: the as-synthesized type obtained directly after synthesis, without any specific treatment; the calcined, obtained after a subsequent calcination step; and the hydrothermal, obtained after a specific autoclave treatment. This eco-friendly process is based on the hydrolysis of a Ti precursor in excess of water, followed by the peptization of the precipitated TiO2. Compared to classical TiO2 synthesis, this method results in crystalline TiO2 nanoparticles without any thermal treatment and uses only small amounts of organic chemicals. Depending on the synthesis parameters, the three crystalline phases of TiO2 (anatase, brookite, and rutile) can be obtained. The morphology of the nanoparticles can also be tailored by the synthesis parameters. The most important parameter is the peptizing agent. Indeed, depending on its acidic or basic character and also on its amount, it can modulate the crystallinity and morphology of TiO2. Colloidal aqueous TiO2 photocatalysts are mainly being used in various photocatalytic reactions for organic pollutant degradation. The as-synthesized materials seem to have equivalent photocatalytic efficiency to the photocatalysts post-treated with thermal treatments and the commercial Evonik Aeroxide P25, which is produced by a high-temperature process. Indeed, as-prepared, the TiO2 photocatalysts present a high specific surface area and crystalline phases. Emerging applications are also referenced, such as elaborating catalysts for fuel cells, nanocomposite drug delivery systems, or the inkjet printing of microstructures. Only a few works have explored these new properties, giving a lot of potential avenues for studying this eco-friendly TiO2 synthesis method for innovative implementations.

Disciplines :

Materials science & engineering
Chemical engineering

Author, co-author :

Mahy, Julien ; Université de Liège - ULiège > Department of Chemical Engineering > Nanomaterials, Catalysis, Electrochemistry

Lejeune, Louise

Haynes, Tommy

Lambert, Stéphanie ; Université de Liège - ULiège > Department of Chemical Engineering > Nanomaterials, Catalysis, Electrochemistry

Marcilli, Raphael Henrique Marques

Fustin, Charles-André

Hermans, Sophie

Language :

English

Title :

Eco-Friendly Colloidal Aqueous Sol-Gel Process for TiO2 Synthesis: The Peptization Method to Obtain Crystalline and Photoactive Materials at Low Temperature

Publication date :

2021

Journal title :

Catalysts

eISSN :

2073-4344

Publisher :

MDPI AG, Basel, Switzerland

Volume :

Pages :

768

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 25 June 2021

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