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Fabrication of Novel Z-Scheme Bi2WO6/NaBiO3 Nanocomposites with Enhanced Photocatalytic Activity in the Degradation of 2,3-Dichlorophenol
- Source :
- Journal of Nanoscience and Nanotechnology. 20:3105-3116
- Publication Year :
- 2020
- Publisher :
- American Scientific Publishers, 2020.
-
Abstract
- The Z-scheme Bi2WO6/NaBiO3 nanocomposites were first fabricated by a facile hydrothermal method, and were then characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, energy dispersive spectrometer, Fourier-transform-infrared spectroscopy, X-ray photoelectron spectroscopy and N2 adsorption–desorption. The as-prepared Bi2WO6/NaBiO3 nanocomposites exhibit outstanding photocatalytic activity and recyclability. A 98.4% photodegradation of 2,3-dichlorophenol (50 mg·L−1) was attained in the presence of Bi2WO6/NaBiO3 (1:10) under the visible-light irradiation in 30 min. In particular, the photocatalytic mechanism has been discussed in detail, based on four aspects: (1) oxidative species, (2) photoelectrochemical performance, (3) conduction band and valence band energy levels and (4) possible transition states and reactions. In conclusion, O−2 is the main active oxidative species in the Bi2WO6/NaBiO3 nanocomposite. The material has higher photocurrent and visible light adsorption but lower electron–hole pairs recombination, which contributes to distinguished photocatalytic efficiency. The Z-scheme photocatalytic path was proposed and the possible degradation process and routes have been summarized.
- Subjects :
- Photocurrent
Nanocomposite
Materials science
Scanning electron microscope
Biomedical Engineering
Bioengineering
02 engineering and technology
General Chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
Photochemistry
X-ray photoelectron spectroscopy
Photocatalysis
General Materials Science
0210 nano-technology
Spectroscopy
Photodegradation
Visible spectrum
Subjects
Details
- ISSN :
- 15334880
- Volume :
- 20
- Database :
- OpenAIRE
- Journal :
- Journal of Nanoscience and Nanotechnology
- Accession number :
- edsair.doi...........51fff15c35f79ae8d2d9449d12c5684a