The visible light induced photocatalytic activity of tungsten trioxide powders

Bamwenda, Gratian R.; Arakawa, Hironori

doi:10.1016/s0926-860x(00)00796-1

Cited by 352 publications

(162 citation statements)

References 27 publications

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“…The band gap of WO 3 is 2.55 eV which is consistent with literature data [22]. The optical absorption spectrum of the ZnO sample is represented by a broad and intense band and characterized by a sharp increase of absorption at 400 nm and a slight decrease at shorter wavelengths.…”

Section: Photocatalysts Characterizationsupporting

confidence: 90%

Sol-Gel Synthesized Semiconductor Oxides in Photocatalytic Degradation of Phenol

Cherepivska

Prihod’ko

2014

ISRN Physical Chemistry

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Effectiveness of photocatalytic degradation of phenol in aqueous solution using semiconductor oxides (SO) prepared by a sol-gel method was examined. The physical and chemical properties of synthesized catalysts were investigated by X-ray diffraction (XRD), diffuse reflectance UV-Vis spectroscopy (DRS), and N 2 -adsorption measurements. The optimal conditions of the photocatalytic degradation of phenol using prepared titanium dioxide sample were defined.

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Section: Photocatalysts Characterizationsupporting

confidence: 90%

Sol-Gel Synthesized Semiconductor Oxides in Photocatalytic Degradation of Phenol

Cherepivska

Prihod’ko

2014

ISRN Physical Chemistry

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“…Moreover, the band at ca. 290 nm in Mo-free catalyst can be related to the presence of octahedral W(6+) species as in polytungstates [44,45] and in W-based bronzes [46], while the absence of a band at 400 nm confirms the absence of WO 3 crystals [47].…”

Section: Catalyst Characterizationmentioning

confidence: 94%

Catalytic abatement of trichloroethylene over Mo and/or W-based bronzes

Blanch-Raga

Soriano

Palomares

et al. 2013

Applied Catalysis B: Environmental

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“…9 In contrast, tungsten trioxide (WO 3 ) has a narrower band gap (2.4-2.8 eV) that enables harvesting visible light. 10 Only a few studies have so far been devoted to the synthesis of porous WO 3 , i.e. using PMMA spheres 11 and by anodization of tungsten foil.…”

mentioning

confidence: 99%

Enhanced photocatalytic properties in well-ordered mesoporous WO3

Krissanasaeranee

Pattinson

et al. 2010

Chem. Commun.

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We used polyisoprene-block-ethyleneoxide copolymers as structure-directing agents to synthesise well-ordered and highly-crystalline mesoporous WO 3 architectures that possess improved photocatalytic properties due to enhanced dye-adsorption in absence of diffusion limitation.As a green technology, semiconductor photocatalysis has attracted increasing interest driven by the search for new energy sources during the past few decades.1 The performance of the photocatalysts strongly depends on their crystal structure and morphology.1,2 It is widely recognized that high crystallinity and a continuous network architecture with controlled pore sizes that facilitate molecular access to high surface areas are highly desired for maximizing their photocatalytic performance. 3,4 This has recently stimulated intensive research in designing mesoporous metal oxides, such as TiO 2 , Nb 2 O 5 , and ZrO 2 . 5 The major drawback of these attempts is that the oxide structures often contain a significant amount of undesired amorphous content, which facilitates the recombination of electrons and holes, thereby limiting the catalytic efficiency.2 The crystallinity can be improved by annealing at high temperatures, upon which, however, the ordered structure typically collapses. Hence, synthesising well-ordered mesoporous structures with high crystallinity still remains a major challenge. 6 Recently, we used polyisoprene-block-ethyleneoxide (PI-b-PEO) copolymers as structure-directing agents to synthesise TiO 2 with controlled mesoporous structures. 7,8 The large interaction parameter between the PI and PEO blocks and the high degree of polymerization allows the rapid formation of structures with long-range order. In addition, the PI-b-PEO morphology has relatively large pore sizes, which facilitate the effective infiltration of functional materials. The resulting TiO 2 exhibited excellent performance in dye-sensitized solar cells. Although TiO 2 is currently the most studied semiconductor photocatalyst, its wide band gap (3.2 eV) limits TiO 2 to a small ultraviolet fraction of solar energy. 9 In contrast, tungsten trioxide (WO 3 ) has a narrower band gap (2.4-2.8 eV) that enables harvesting visible light.10 Only a few studies have so far been devoted to the synthesis of porous WO 3 , i.e. using PMMA spheres 11 and by anodization of tungsten foil. 12 Despite yielding only macroporous and weakly-ordered structures these studies still demonstrated enhanced photocatalytic properties compared with their dense counterparts. It is therefore likely that improving the pore structure and crystallinity will maximise the photocatalytic performance of WO 3 . Herein, we demonstrate the synthesis of highly-crystalline mesoporous WO 3 with well-ordered pore architectures using a sol-gel process and PI-b-PEO copolymers as structure-directing agents. We investigated the effect of polymer-to-WO 3 weight ratio on the morphology and tested the photocatalytic performance for the degradation of methylene blue under visible light.In a typical synthesis, 45 mg ...

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The visible light induced photocatalytic activity of tungsten trioxide powders

Cited by 352 publications

References 27 publications

Sol-Gel Synthesized Semiconductor Oxides in Photocatalytic Degradation of Phenol

Sol-Gel Synthesized Semiconductor Oxides in Photocatalytic Degradation of Phenol

Catalytic abatement of trichloroethylene over Mo and/or W-based bronzes

Enhanced photocatalytic properties in well-ordered mesoporous WO3

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