A Novel Technique for the Deposition of Bismuth Tungstate onto Titania Nanoparticulates for Enhancing the Visible Light Photocatalytic Activity

Ratova, Marina; Kelly, Peter; West, G.T.; Tosheva, Lubomira

doi:10.3390/coatings6030029

Cited by 12 publications

(15 citation statements)

References 29 publications

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“…The method provides such obvious advantages, in comparison to chemical methods, as; no requirement for toxic or hazardous precursors, an absence of hazardous process by-products, excellent control over uniformity and composition and great up-scaling potential. Despite the fact that magnetron sputtering is typically used for deposition of coatings onto flat substrates, the authors of the present paper have recently shown that it can be readily used for deposition of functional coatings onto particulates of various shapes and sizes, from several millimeters in diameter [4], to nanoparticulates [4,32].…”

Section: Introductionmentioning

confidence: 85%

Characterisation and properties of visible light-active bismuth oxide-titania composite photocatalysts

Ratova

Tosheva

Kelly

et al. 2019

Sustainable Materials and Technologies

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Bismuth oxide -titanium dioxide composite materials were produced by pulsed DC reactive magnetron sputtering onto two types of commercially available titanium dioxide nanoparticles. The use of an oscillating bowl enabled deposition of bismuth oxide uniformly onto loose powders, in contrast to solid substrates typically used for the conventional magnetron sputtering processes.Variation of the deposition time allowed the production of composite materials with different amounts of bismuth oxide. The composite materials, as well as uncoated titania powders, were extensively analysed by a range of analytical techniques, including SEM/EDX, XRD, BET, XPS, TEM and UV-visible diffuse reflectance spectroscopy. Photocatalytic properties of the materials were assessed under simulated visible light irradiation via degradation of acetone and methanol through measurements of carbon dioxide evolution. Additionally, the composite materials were characterised with a newly developed technique of reversed double-beam photoacoustic spectroscopy in order to obtain information on the distribution of electron traps. Bismuth oxide was found in crystalline β-Bi2O3 form on both types of substrates without any additional heat treatment applied. Though the distribution of bismuth oxide on titanium dioxide was found to depend strongly on particle size and deposition time used, the composite materials exhibited significantly enhanced visible light photocatalytic activity compared to either of the commercial titania materials used as a substrate.

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Section: Introductionmentioning

confidence: 85%

Characterisation and properties of visible light-active bismuth oxide-titania composite photocatalysts

Ratova

Tosheva

Kelly

et al. 2019

Sustainable Materials and Technologies

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“…The schematic representation of the setup is given elsewhere [20,21]. Bismuth and tungsten targets were fitted to these two magnetrons (both targets were 99.5% pure and bonded to copper backing plates).…”

Section: Deposition Processmentioning

confidence: 99%

“…As the substrates can range in size from several mm 2 to 6 m × 3 m "jumbo" sheets of architectural glazing, the deposition process is widely used for the production of various coatings, including photocatalysts, both in laboratory and industrial facilities. However, it is generally accepted that magnetron sputtering is predominately a "line of sight" process, best suited for the deposition of coatings onto flat substrates [20]. Nevertheless, the authors have recently successfully developed and reported a technology that enables the deposition of photocatalytic coatings onto substrates of "irregular" shape, such as powders and nanoparticles [20,21].…”

Section: Introductionmentioning

confidence: 99%

“…However, it is generally accepted that magnetron sputtering is predominately a "line of sight" process, best suited for the deposition of coatings onto flat substrates [20]. Nevertheless, the authors have recently successfully developed and reported a technology that enables the deposition of photocatalytic coatings onto substrates of "irregular" shape, such as powders and nanoparticles [20,21]. In the present work, this process was used for the deposition of photocatalytic bismuth tungstate coatings onto spherically-shaped glass beads, as opposed to the flat substrates reported in earlier work of the authors, to provide considerably higher surface area.…”

Section: Introductionmentioning

confidence: 99%

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Reactive Magnetron Sputter Deposition of Bismuth Tungstate Coatings for Water Treatment Applications under Natural Sunlight

et al. 2017

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Bismuth complex oxides, in particular, bismuth tungstate, have recently attracted attention as promising photocatalytic materials for water treatment processes. In the present work, photocatalytic bismuth tungstate films were prepared by pulsed direct current (DC) reactive magnetron sputtering of Bi and W targets in an Ar/O 2 atmosphere onto spherically-shaped glass beads. The uniform coverage of the substrate was enabled by the use of oscillating bowl placed underneath the magnetrons. The atomic ratio of Bi/W was varied through the variation of the power applied to the magnetrons. The deposited coatings were analyzed by the scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy and atomic force microscopy. The photocatalytic properties of the films were studied via the methylene blue (MB) degradation process under artificial (fluorescent light) and natural (sunlight) irradiation, and compared to the photocatalytic performance of titanium dioxide coatings deposited onto identical substrates. The results showed that the photocatalytic performance of bismuth tungstate and bismuth oxide-coated beads was superior to that exhibited by TiO 2 -coated beads. Overall, reactive magnetron co-sputtering has been shown to be a promising technique for deposition of narrow band gap bismuth-based semiconducting oxides onto irregularly-shaped substrates for potential use in water treatment applications.

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“…Fortunately, photocatalysis technology appears as an efficient, economical, and environmental friendly technology, which can be applied in environmental remediation, as well as solar energy conversion, since it was discovered in 1972 [1][2][3]. To date, various types of semiconductor photocatalysts have been explored, especially the TiO 2 -based photocatalysts which are always being ranked as the most researched ones [4][5][6]. However, their applications are retarded by low ultilization efficiency for solar light absorption or a high recombination of charge carriers, thus making development of photocatalysts with visible light responsive ability indispensable.…”

Section: Introductionmentioning

confidence: 99%

Composition and Structure Evolution of Bi2O3 Coatings as Efficient Photocatalysts

Liu

Líu

2017

Coatings

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Abstract:To overcome the recovery disadvantages of Bi 2 O 3 photocatalyst in the form of powder, Bi 2 O 3 photocatalyst coatings were developed via a ball milling, followed by the calcination method. The composition and structure evolution rules of the as-synthesized samples were analyzed based on XRD (X-ray powder diffraction) patterns and SEM (scanning electron microscope) observations. XPS (X-ray photoelectron spectroscopy) and UV-Vis (Ultraviolet-visible) spectra were also employed to characterize the samples. The results showed that monoclinic Bi 2 O 3 coatings were obtained after sintering Bi coatings at 673 or 773 K for 2 h, while calcination at a higher temperature and for a longer time resulted in monoclinic and triclinic mixed-phase Bi 2 O 3 coatings. Bi 2 O 3 coatings with a radial growth structure assembled by nanosheets could be realized at a lower temperature lasting for a longer time, while sintering at a higher temperature with relatively short oxidation time led to tangential growth structure. Photodegradation of malachite green solution under simulated solar irradiation for 180 min showed that the largest degradation efficiency of 91.49% was achieved over the photocatalyst coatings calcined at 873 K for 5 h. Additionally, the degradation efficiency was maintained above 80% even after three cycles.

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A Novel Technique for the Deposition of Bismuth Tungstate onto Titania Nanoparticulates for Enhancing the Visible Light Photocatalytic Activity

Cited by 12 publications

References 29 publications

Characterisation and properties of visible light-active bismuth oxide-titania composite photocatalysts

Characterisation and properties of visible light-active bismuth oxide-titania composite photocatalysts

Reactive Magnetron Sputter Deposition of Bismuth Tungstate Coatings for Water Treatment Applications under Natural Sunlight

Composition and Structure Evolution of Bi2O3 Coatings as Efficient Photocatalysts

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