Oxygen Vacancy Induced Band-Gap Narrowing and Enhanced Visible Light Photocatalytic Activity of ZnO

2012 ◽  
Vol 4 (8) ◽  
pp. 4024-4030 ◽  
Author(s):  
Junpeng Wang ◽  
Zeyan Wang ◽  
Baibiao Huang ◽  
Yandong Ma ◽  
Yuanyuan Liu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Oxygen Vacancy ◽  
Visible Light ◽  
Band Gap ◽  
Visible Light Photocatalytic Activity ◽  
Band Gap Narrowing ◽  
Visible Light Photocatalytic

Motivating visible light photocatalytic activity of ultrathin Bi2O2(OH)xCl2−x solid solution with exposed {001} facets by the co-effect of oxygen vacancy and OH replacement

Nanoscale ◽  
2018 ◽  
Vol 10 (32) ◽  
pp. 15294-15302 ◽  
Author(s):  
Xiaoyong Wu ◽  
Kaiqi Li ◽  
Yuan Li ◽  
Gaoke Zhang
Keyword(s):  
Solid Solution ◽  
Photocatalytic Activity ◽  
Oxygen Vacancy ◽  
Visible Light ◽  
Visible Light Photocatalytic Activity ◽  
Effect Of Oxygen ◽  
Visible Light Photocatalytic

The visible light photocatalytic activity of an ultrathin Bi2O2(OH)xCl2−x solid solution with an exposed {001} facet was boosted by adjusting the concentrations of oxygen vacancy and OH in it.

Coupling with a narrow-band-gap semiconductor for the enhancement of visible-light photocatalytic activity: preparation of Bi2OxS3−x/Nb6O17 and application to the degradation of methyl orange

2016 ◽  
Vol 45 (35) ◽  
pp. 13944-13950 ◽  
Author(s):  
Gang Yan ◽  
Hongfei Shi ◽  
Huaqiao Tan ◽  
Wanbin Zhu ◽  
Yonghui Wang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Band Gap ◽  
Photocatalytic Performance ◽  
Narrow Band ◽  
Visible Light Photocatalytic Activity ◽  
Degradation Of Methyl Orange ◽  
Visible Light Photocatalytic

A new 2D sheet composite Bi2OxS3−x/Nb6O17 has been prepared, which shows good visible light photocatalytic performance for the degradation of methyl orange.

scholarly journals Enhanced Visible Light Photocatalytic Activity of Mesoporous AnataseTiO2Codoped with Nitrogen and Chlorine

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Xiuwen Cheng ◽  
Xiujuan Yu ◽  
Zipeng Xing ◽  
Lisha Yang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Band Gap ◽  
Light Absorption ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Visible Region ◽  
X Ray ◽  
Visible Light Photocatalytic Activity ◽  
Visible Light Photocatalytic

Anatase mesoporous titanium dioxide codoped with nitrogen and chlorine (N-Cl-TiO2) photocatalysts were synthesized through simple one-step sol-gel reactions in the presence of ammonium chloride. The resulting materials were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), and ultraviolet-visible diffuse reflection spectrum (UV-vis DRS). XRD results indicated that codoping with nitrogen and chlorine could effectively retard the phase transformation of TiO2from anatase to rutile and the growth of the crystallite sizes. XPS revealed that nitrogen and chlorine elements were incorporated into the lattice of TiO2through substituting the lattice oxygen atoms. DRS exhibited that the light absorption of N-Cl-TiO2in visible region was greatly improved. As a result, the band gap of TiO2was reduced to 2.12 eV. The photocatalytic activity of the as-synthesized TiO2was evaluated for the degradation of RhB and phenol under visible light irradiation. It was found that N-Cl-TiO2catalyst exhibited higher visible light photocatalytic activity than that of P25 TiO2and N-TiO2, which was attributed to the small crystallite size, intense light absorption in visible region, and narrow band gap.

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