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Daylight Photoactive TiO₂ Sol-Gel Nanoparticles: Sustainable Environmental Contribution.

ABSTRACT: Visible-light-photoactive titania micro- or nanoparticles excel in a wide range of industrial areas, particularly in environmental remediation. The sol-gel methodology is one pivotal technique which has been successfully used to synthesize either crystalline and amorphous TiO₂ micro- and nanoparticles due to its outstanding chemical simplicity and versatility, along with the green chemistry approach. This short review aims to collect and discuss the most recent developments in visible-light-photoactive titania-based nanoparticles in the environmental remediation area. Titania co-doping, titania composite design, and, recently, amorphous networks have been the most used strategies to address this goal. Finally, a prediction regarding the future of these fields is given.

SUBMITTER: Barcelos DA

PROVIDER: S-EPMC10095711 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature

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Daylight Photoactive TiO<sub>2</sub> Sol-Gel Nanoparticles: Sustainable Environmental Contribution.

Barcelos Daniel Alves DA Gonçalves Maria Clara MC

Materials (Basel, Switzerland) 20230329 7

Visible-light-photoactive titania micro- or nanoparticles excel in a wide range of industrial areas, particularly in environmental remediation. The sol-gel methodology is one pivotal technique which has been successfully used to synthesize either crystalline and amorphous TiO<sub>2</sub> micro- and nanoparticles due to its outstanding chemical simplicity and versatility, along with the green chemistry approach. This short review aims to collect and discuss the most recent developments in visible ...[more]

PMID: 37049025

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Project description:Titanium dioxide (TiO2) in the form of thin films has attracted enormous attention for photocatalysis. It combines the fundamental properties of TiO2 as a large bandgap semiconductor with the advantage of thin films, making it competitive with TiO2 powders for recycling and maintenance in photocatalytic applications. There are many aspects affecting the photocatalytic performance of thin film structures, such as the nanocrystalline size, surface morphology, and phase composition. However, the quantification of each influencing aspect needs to be better studied and correlated. Here, we prepared a series of TiO2 thin films using a sol-gel process and spin-coated on p-type, (100)-oriented silicon substrates with a native oxide layer. The as-deposited TiO2 thin films were then annealed at different temperatures from 400 °C to 800 °C for 3 h in an ambient atmosphere. This sample synthesis provided systemic parameter variation regarding the aspects mentioned above. To characterize thin films, several techniques were used. Spectroscopic ellipsometry (SE) was employed for the investigation of the film thickness and the optical properties. The results revealed that an increasing annealing temperature reduced the film thickness with an increase in the refractive index. Atomic force microscopy (AFM) was utilized to examine the surface morphology, revealing an increased surface roughness and grain sizes. X-ray diffractometry (XRD) and UV-Raman spectroscopy were used to study the phase composition and crystallite size. The annealing process initially led to the formation of pure anatase, followed by a transformation from anatase to rutile as the annealing temperature increased. An overall enhancement in crystallinity was also observed. The photocatalytic properties of the thin films were tested using the photocatalytic decomposition of acetone gas in a home-built solid (photocatalyst)-gas (reactant) reactor. The composition of the gas mixture in the reaction chamber was monitored using in situ Fourier transform infrared spectroscopy. Finally, all of the structural and spectroscopic characteristics of the TiO2 thin films were quantified and correlated with their photocatalytic properties using a correlation matrix. This provided a good overview of which film properties affect the photocatalytic efficiency the most.

Dataset Information

Daylight Photoactive TiO₂ Sol-Gel Nanoparticles: Sustainable Environmental Contribution.

Publications

Daylight Photoactive TiO<sub>2</sub> Sol-Gel Nanoparticles: Sustainable Environmental Contribution.

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Dataset Information

Daylight Photoactive TiO2 Sol-Gel Nanoparticles: Sustainable Environmental Contribution.

Publications

Daylight Photoactive TiO<sub>2</sub> Sol-Gel Nanoparticles: Sustainable Environmental Contribution.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

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Daylight Photoactive TiO₂ Sol-Gel Nanoparticles: Sustainable Environmental Contribution.