Oxygen vacancies confined in SnO 2 nanoparticles for desirable electronic structure and enhanced visible light photocatalytic activity

2017 ◽  
Vol 420 ◽  
pp. 399-406 ◽  
Author(s):  
Yuanjie Yang ◽  
Yuhua Wang ◽  
Shu Yin
Keyword(s):  
Electronic Structure ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Oxygen Vacancies ◽  
Visible Light Photocatalytic Activity ◽  
Visible Light Photocatalytic

scholarly journals Rendering Visible-Light Photocatalytic Activity to Undoped ZnO via Intrinsic Defects Engineering

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1163
Author(s):  
Lan-li Chen ◽  
Bao-gai Zhai ◽  
Yuan Ming Huang
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Density Functional Calculations ◽  
Density Functional ◽  
Oxygen Vacancies ◽  
Intrinsic Defect ◽  
Visible Light Photocatalytic Activity ◽  
Zno Nanocrystals ◽  
Visible Light Photocatalytic

It is significant to render visible-light photocatalytic activity to undoped ZnO nanostructures via intrinsic defect engineering. In this work, undoped ZnO nanocrystals were derived via co-precipitation synthesis. The resulting ZnO nanocrystals were characterized by means of X-ray diffraction, scanning electron microscopy, photoluminescence spectroscopy, and ultraviolet-visible absorption spectroscopy, respectively. The visible-light photocatalytic activity of the products were characterized by monitoring the decomposition of methyl orange in water under visible-light illumination of a 300 W halogen lamp. It is found that undoped ZnO nanocrystals exhibit visible-light photocatalytic activity with their first-order rate constant up to 4.6 × 10−3 min−1. Density functional calculations show that oxygen vacancies create deep energy levels at EV + 0.76 eV in the bandgap of ZnO. In conjunction with the density functional calculations, the photocatalytic degradation of methyl orange under visible-light irradiation provides direct evidence that oxygen vacancies in ZnO nanocrystals yield the visible-light photocatalytic activity. Our results demonstrate that visible-light photocatalytic activity can be endowed to undoped ZnO nanocrystals by manipulating the intrinsic defects in ZnO. Intrinsic defect-modulated ZnO photocatalysts thus represent a powerful configuration for further development toward visible-light responsive photocatalysis.

scholarly journals Microwave-assisted synthesis of 3D Bi2MoO6 microspheres with oxygen vacancies for enhanced visible-light photocatalytic activity

2020 ◽  
Vol 19 (12) ◽  
pp. 1697-1706
Author(s):  
Chengjuan Huang ◽  
Shuaishuai Ma ◽  
Yuqing Zong ◽  
Jiandong Gu ◽  
Jinjuan Xue ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Oxygen Vacancies ◽  
Solvothermal Method ◽  
Microwave Assisted Synthesis ◽  
Visible Light Photocatalytic Activity ◽  
Microwave Assisted ◽  
Photocatalytic Performances ◽  
Visible Light Photocatalytic

The 3D Bi2MoO6 microspheres with OVs were obtained via a simple microwave-assisted solvothermal method and exhibit enhanced visible-light photocatalytic performances.

scholarly journals Electron transfer in ZnO–Fe2O3 aqueous slurry systems and its effects on visible light photocatalytic activity

2017 ◽  
Vol 7 (18) ◽  
pp. 4041-4047 ◽  
Author(s):  
H. Lachheb ◽  
F. Ajala ◽  
A. Hamrouni ◽  
A. Houas ◽  
F. Parrino ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Electronic Structure ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Charge Separation ◽  
Strong Interactions ◽  
Visible Light Photocatalytic Activity ◽  
Efficient Charge ◽  
Visible Light Photocatalytic ◽  
Aqueous Slurry

The strong interactions between ZnO and Fe2O3 modify the nanocomposite's electronic structure producing efficient charge separation and superior photoactivity.

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