Controlling the synergistic effect of oxygen vacancies and N dopants to enhance photocatalytic activity of N-doped TiO2 by H2 reduction

2012 ◽  
Vol 425-426 ◽  
pp. 117-124 ◽  
Author(s):  
Zizhong Zhang ◽  
Jinlin Long ◽  
Xiuqiang Xie ◽  
Huaqiang Zhuang ◽  
Yangen Zhou ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Synergistic Effect ◽  
Oxygen Vacancies ◽  
Doped Tio2 ◽  
Effect Of Oxygen

The role of Sn in enhancing the visible-light photocatalytic activity of hollow hierarchical microspheres of the Bi/BiOBr heterojunction

2015 ◽  
Vol 17 (12) ◽  
pp. 8078-8086 ◽  
Author(s):  
Xingmiao Zhang ◽  
Guangbin Ji ◽  
Yousong Liu ◽  
Xuguang Zhou ◽  
Yan Zhu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Synergistic Effect ◽  
Charge Separation ◽  
Oxygen Vacancies ◽  
Separation Efficiency ◽  
Hierarchical Microspheres ◽  
Charge Separation Efficiency ◽  
Effect Of Oxygen ◽  
Visible Light Photocatalytic

The synergistic effect of oxygen vacancies and the Bi/BiOBr heterojunction broadens the light absorption range and promotes the charge separation efficiency.

scholarly journals Magnetic resonance study of annealed and rinsed N-doped TiO2 nanoparticles

2013 ◽  
Vol 11 (12) ◽  
pp. 1996-2004 ◽  
Author(s):  
Niko Guskos ◽  
Janusz Typek ◽  
Aleksander Guskos ◽  
Grzegorz Zolnierkiewicz ◽  
Pawel Berczynski ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Light Absorption ◽  
Oxygen Vacancies ◽  
Diffuse Reflectance Spectroscopy ◽  
Epr Spectra ◽  
Magnetic Clusters ◽  
Paramagnetic Resonance ◽  
Doped Tio2 ◽  
Phenol Decomposition ◽  
Higher Temperature

AbstractNanoparticles of nitrogen-modified TiO2 (N-doped TiO2) calcined at 300°C and 350°C, have been prepared with and without water rinsing. Samples were characterized by x-ray diffractrometry (XRD) and optical spectroscopy. The electron paramagnetic resonance (EPR) spectra from centers involving oxygen vacancies were recorded for all samples. These could be attributed to paramagnetic surface centers of the hole type, for example to paramagnetic oxygen radicals O−, O2−etc. The concentration of these centers increased after water rising and it further increased for samples annealed at higher temperature. Additionally, for samples calcined at 300°C, and calcined at 350°C and rinsed, the EPR spectra evidenced the presence of magnetic clusters of Ti3+ ions. The photocatalytic activity of samples was studied towards phenol decomposition under unltraviolet-visible (UV-Vis) irradiation. It was found that, in comparison to the starting materials, the rinsed materials showed increased photocatalytic activity towards phenol oxidation. The light absorption (UV-Vis/DRS) as well as surface Fourier transform infrared/diffuse reflectance spectroscopy (FTIR/DR) studies confirmed a significantly enhanced light absorption and the presence of nitrogen groups on the photocatalysts surfaces, respectively. A significant increase of concentration of paramagnetic centers connected with oxygen vacancies after water rising has had an essential influence on increasing their photocatalytic activity.

scholarly journals Mo doped TiO2: impact on oxygen vacancies, anatase phase stability and photocatalytic activity

2020 ◽  
Vol 3 (2) ◽  
pp. 025008 ◽  
Author(s):  
Vignesh Kumaravel ◽  
Stephen Rhatigan ◽  
Snehamol Mathew ◽  
Marie Clara Michel ◽  
John Bartlett ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Phase Stability ◽  
Oxygen Vacancies ◽  
Anatase Phase ◽  
Doped Tio2
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