Heterogeneous photocatalytic treatment of wastewater in ultraviolet light irradiation—photocatalyst Bi2WO6 microsphere with high repeatability

Lü, Xiaojing; Peng, Yin; Han, Zhengzheng

doi:10.1007/s12200-012-0291-9

Cited by 10 publications

(5 citation statements)

References 19 publications

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“…The photocatalytic activity of the samples was evaluated by degradation of Rhodamine B dye under visible light irradiation. Rhodamine B is an azo-dye and a typical wastewater pollutant from the textile industry; moreover, it is one of the most common model pollutants used for testing bismuth complex oxide photocatalytic properties [28,32,44]. The plots of RhB degradation kinetics during each 1h experiment are presented in Figure 4, and the calculated pseudo-first order reaction constants, ka, are given in Table 2.…”

Section: Photocatalytic Activity Assessmentmentioning

confidence: 99%

“…Overall, bismuth tungstate has been shown to be capable of degrading a wide range of pollutants, including inorganic dyes [18,27,28], volatile organic compounds [29], nitric oxides [30] and pharmaceuticals [31]. Furthermore, bismuth oxide and bismuth tungstate have recently been reported as efficient photocatalysts for water treatment processes [18,32]. However, for efficient water treatment processes, disinfection is as important as decontamination, and the disinfecting properties of photocatalytic bismuth-based oxides are considerably less studied to date -few reports refer to photocatalytic bismuth (complex) oxides as antimicrobial materials [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

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Highly efficient photocatalytic bismuth oxide coatings and their antimicrobial properties under visible light irradiation

Ratova

Redfern

Verran

et al. 2018

Applied Catalysis B: Environmental

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The aim of the present paper is to assess the antimicrobial activity of novel narrow band gap semiconductor photocatalysts under visible light irradiation, compared to titanium dioxide, which is the conventionally used photocatalytic material. Bismuth oxide, bismuth tungstate and titanium dioxide coatings were prepared using pulsed DC reactive magnetron sputter deposition onto batches of 2 mm spherical glass beads that were agitated during the deposition process to ensure uniform coverage. Additional coatings were deposited onto flat glass substrates for specific analytical techniques. Following deposition, the coatings were annealed in air at 673 K for 30 min to enable crystal structure development. Annealed coatings were analysed with SEM, EDX, XRD, XPS, AFM, UVvisible spectroscopy and water contact angle measurements. The photocatalytic properties of the coatings were initially assessed via a Rhodamine B dye degradation test under visible light irradiation. Antimicrobial efficiency of the coatings was tested via inactivation of E. coli; additionally, bacterial adhesion experiments were performed for all types of the studied coatings. It was found that the performance of bismuth oxide for both dye degradation and bacterial inactivation experiments under visible light was superior to that observed for either bismuth tungstate or titanium dioxide. Moreover, bismuth oxide coatings (and to a lesser extent -bismuth tungstate), due to its hydrophobic nature was able to inhibit bacterial adhesion to the surface.

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Section: Photocatalytic Activity Assessmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Highly efficient photocatalytic bismuth oxide coatings and their antimicrobial properties under visible light irradiation

Ratova

Redfern

Verran

et al. 2018

Applied Catalysis B: Environmental

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“…Of the various bismuth complex oxides studied, bismuth tungstate receives the most attention as a novel photocatalytic material with high visible light efficiency. Bismuth tungstate has been reported as an efficient photocatalyst for the degradation of organic dyes (methylene blue [17],rodhamine B [8,11,15,17]), acetaldehyde [16,18], and the inactivation of bacterial organisms, such as E.coli [19].…”

Section: Main Textmentioning

confidence: 99%

Photocatalytic visible-light active bismuth tungstate coatings deposited by reactive magnetron sputtering

Ratova

West

Kelly

2015

Vacuum

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Photocatalytic bismuth tungstate thin films with visible-light activity were deposited via reactive pulsed DC magnetron sputtering onto soda-lime glass substrates. Varying the power delivered to the bismuth and tungsten targets allowed control over the Bi/W ratio in the coatings, and therefore the structural and optical properties of the coatings. Asdeposited coatings were characterised with amorphous microstructures and were annealed at 673K to develop crystallinity. The visible light photocatalytic activity of the coatings, which was analysed using the methylene blue degradation test, was found to be superior to that of a commercial titania-based photocatalytic product. \

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“…Bismuth tungstate, Bi 2 WO 6 , is one of the most widely studied and reportedly efficient photocatalytic materials [12][13][14][15][16]. However, there are very few reports to date describing the use of bismuth tungstate for water purification [17,18].…”

Section: Introductionmentioning

confidence: 99%

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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Heterogeneous photocatalytic treatment of wastewater in ultraviolet light irradiation—photocatalyst Bi2WO6 microsphere with high repeatability

Cited by 10 publications

References 19 publications

Highly efficient photocatalytic bismuth oxide coatings and their antimicrobial properties under visible light irradiation

Highly efficient photocatalytic bismuth oxide coatings and their antimicrobial properties under visible light irradiation

Photocatalytic visible-light active bismuth tungstate coatings deposited by reactive magnetron sputtering

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

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