Enhanced photosensitized activity of a BiOCl–Bi2WO6 heterojunction by effective interfacial charge transfer

Yang, Wenjuan; Ma, Bo; Wang, Weichao; Wen, Yanwei; Zeng, Dawen; Shan, Bin

doi:10.1039/c3cp53628a

Cited by 114 publications

(66 citation statements)

References 49 publications

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“…Furthermore, the O1s peak can be separated into three peaks at 530.05, 530.69 and 532.29 eV. The two lower binding energy centers at 530.05 eV, 530.69 eV belong to the coordination of oxygen in Bi–O and W–O, respectively3435. The higher binding energy centered at 532.29 eV can be attributed to the coordination of oxygen in O–H or adsorbed oxygen343536.…”

Section: Resultsmentioning

confidence: 97%

Fabrication of Wide–Range–Visible Photocatalyst Bi2WO6−x nanoplates via Surface Oxygen Vacancies

Yao

Zong

et al. 2016

Sci Rep

183

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Bi2WO6 as a high visible-light-driven catalyst has been aroused broad interest. However, it can only be excitated by the light with λ < 450 nm and the solar energy utilization need to be improved. Here, the wide–range–visible photoresponse Bi2WO6−x nanoplates were fabricated by introducing surface oxygen vacancies through the controllable hydrogen reduction method. The visible photoresponse wavelength range is extended from 450 nm to more than 600 nm. In addition, the photocatalytic activity of Bi2WO6−x is also increased and is 2.1 times as high as that of pristine Bi2WO6. The extending of the photoresponse range and the enhancement of the photoactivity both can be attributed to the surface-oxygen-vacancy states. This is because surface-oxygen–vacancy states generated above and partly overlapping of with the valence band (VB) will result in the rising of valence band maximum (VBM), thus broadening the VB width. This approach is proposed to develop many types of wide–range–visible optical materials and to be applicable to many narrow and wide bandgap materials.

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Section: Resultsmentioning

confidence: 97%

Fabrication of Wide–Range–Visible Photocatalyst Bi2WO6−x nanoplates via Surface Oxygen Vacancies

Yao

Zong

et al. 2016

Sci Rep

183

View full text Add to dashboard Cite

show abstract

“…The Bi 2 WO 6 -based heterostructures with different morphologies were usually synthesized by hydrothermal method, for example, Fe 2 O 3 /Bi 2 WO 6 microspheres [7], Bi 2 O 3 /Bi 2 WO 6 rods [22], TiO 2 /Bi 2 WO 6 hollow tubes [23], BiOCl/Bi 2 WO 6 nanoflowers [24], and BiOBr/Bi 2 WO 6 microspheres [25], etc. But until now, few reports concerned with the photocatalytic activity of In 2 O 3 /Bi 2 WO 6 heterostructured microbelts synthesized by the electrospinning process.…”

Section: Introductionmentioning

confidence: 99%

Facile fabrication of In2O3/Bi2WO6 heterostructured microbelts with enhanced photocatalytic activity

Liu

Wang

et al. 2014

J Sol-Gel Sci Technol

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The In 2 O 3 /Bi 2 WO 6 heterostructured microbelts with the diameters around 500 nm-1 lm have been fabricated by electrospinning combined with the annealing process. The as-prepared microbelts were characterized by thermogravimetric and differential scanning calorimetry, fourier transform infrared spectroscope, X-ray diffraction, scanning electron microscope and transmission electron microscope. It was found that the In 2 O 3 /Bi 2 WO 6 microbelts reported here showed the well-defined morphology. Additionally, In 2 O 3 /Bi 2 WO 6 heterostructured microbelts exhibit the enhanced photocatalytic activity under the simulated sunlight irradiation compared with the pure Bi 2 WO 6 microbelts.

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“…The aqueous dye solution is stable in visible light. [45] Figure 10(a) for BiOCl without PVP reveals that photodegradation occurred but with a shift in the absorbance. The initial peak absorbance was at 553 nm.…”

Section: Optical Absorbance and Photocatalytic Activitymentioning

confidence: 99%

Size-controlled BiOCl–RGO composites having enhanced photodegradative properties

Kang

Pawar

Pyo

et al. 2015

Journal of Experimental Nanoscience

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Visible light-active bismuth oxychlorideÀreduced graphene oxide (BiOClÀRGO) composite photocatalysts were synthesised using a hydrothermal method at low temperature, and at a low cost. This approach reduced the recombination of electronÀhole pairs and thereby provided more efficient photocatalysts. The size of BiOCl structure was controlled by polyvinylpyrrolidone (PVP) addition. Furthermore, formation of nanosized BiOCl sheets and BiOClÀRGO composites were confirmed by X-ray diffraction, X-ray photoelectron spectroscopy, fieldemission scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. Fabricated BiOClÀRGO composite with PVP exhibited better photocatalytic activity than pure BiOCl grown with and without PVP towards degradation of Rhodamine B (RhB). It was found that the composite photocatalyst degrades RhB completely within 310 min as compared with several hours for pure BiOCl. The improved photocatalytic performance of BiOClÀRGO composite was attributed to its high specific surface area (22.074 m 2 g ¡1 and existence of polar surfaces, compared with 9.831 m 2 g ¡1 for pure BiOCl). The analyses indicated that RGO helped to reduce recombination losses and improve electron transport. It also showed that presence of polar surfaces improved photocatalytic activity of BiOCl. Hence, BiOClÀRGO composite is a promising catalyst for the degradation of organic pollutants under visible light and could be used in applications such as water purification devices.

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Enhanced photosensitized activity of a BiOCl–Bi2WO6 heterojunction by effective interfacial charge transfer

Cited by 114 publications

References 49 publications

Fabrication of Wide–Range–Visible Photocatalyst Bi2WO6−x nanoplates via Surface Oxygen Vacancies

Fabrication of Wide–Range–Visible Photocatalyst Bi2WO6−x nanoplates via Surface Oxygen Vacancies

Facile fabrication of In2O3/Bi2WO6 heterostructured microbelts with enhanced photocatalytic activity

Size-controlled BiOCl–RGO composites having enhanced photodegradative properties

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