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High photocatalytic activity of Fe₂O₃/TiO₂ nanocomposites prepared by photodeposition for degradation of 2,4-dichlorophenoxyacetic acid.

ABSTRACT: Two series of Fe₂O₃/TiO₂ samples were prepared via impregnation and photodeposition methods. The effect of preparation method on the properties and performance of Fe₂O₃/TiO₂ for photocatalytic degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) under UV light irradiation was examined. The Fe₂O₃/TiO₂ nanocomposites prepared by impregnation showed lower activity than the unmodified TiO₂, mainly due to lower specific surface area caused by heat treatment. On the other hand, the Fe₂O₃/TiO₂ nanocomposites prepared by photodeposition showed higher photocatalytic activity than the unmodified TiO₂. Three times higher photocatalytic activity was obtained on the best photocatalyst, Fe₂O₃(0.5)/TiO₂. The improved activity of TiO₂ after photodeposition of Fe₂O₃ was contributed to the formation of a heterojunction between the Fe₂O₃ and TiO₂ nanoparticles that improved charge transfer and suppressed electron-hole recombination. A further investigation on the role of the active species on Fe₂O₃/TiO₂ confirmed that the crucial active species were both holes and superoxide radicals. The Fe₂O₃(0.5)/TiO₂ sample also showed good stability and reusability, suggesting its potential for water purification applications.

SUBMITTER: Lee SC

PROVIDER: S-EPMC5433238 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature

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High photocatalytic activity of Fe2O3/TiO2 nanocomposites prepared by photodeposition for degradation of 2,4-dichlorophenoxyacetic acid.

Lee Shu Chin SC Lintang Hendrik O HO Yuliati Leny L

Beilstein journal of nanotechnology 20170424

Two series of Fe2O3/TiO2 samples were prepared via impregnation and photodeposition methods. The effect of preparation method on the properties and performance of Fe2O3/TiO2 for photocatalytic degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) under UV light irradiation was examined. The Fe2O3/TiO2 nanocomposites prepared by impregnation showed lower activity than the unmodified TiO2, ...[more]

PMID: 28546886

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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

High photocatalytic activity of Fe₂O₃/TiO₂ nanocomposites prepared by photodeposition for degradation of 2,4-dichlorophenoxyacetic acid.

Publications

High photocatalytic activity of Fe<sub>2</sub>O<sub>3</sub>/TiO<sub>2</sub> nanocomposites prepared by photodeposition for degradation of 2,4-dichlorophenoxyacetic acid.

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