Journal
SN APPLIED SCIENCES
Volume 1, Issue 5, Pages -Publisher
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1007/s42452-019-0502-8
Keywords
Nitrogen-doped; Black TiO2 spheres; Photocatalytic degradation; Band structure
Categories
Funding
- National Natural Science Foundation of China [11264037, 51602273, 61464010, 61604126]
- Wuhan University of Technology [2018-KF-14]
- Natural Science Foundation of Xinjiang [2017D01C055]
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N-doped black TiO2 spheres (N-2-b-TiO2) were prepared by solvothermal reaction and calcination under a nitrogen atmosphere. N-doping introduces new impurity levels above the TiO2 valence band, enhancing the effective absorption of visible light. The presence of O-V and Ti3+ in the disordered outer layer inhibits electron-hole pair recombination, and the spherical structure provides many active sites. Those were confirmed by X-ray diffraction, Fourier transform IR, X-ray photoelectron spectroscopy and High-resolution transmission electron microscopy. UV-visible absorption indicates that the nitrogen-doped black TiO2 samples has a reduced band gap and a strong visible light absorption, which is attributed to the doping of O-V, Ti3+ and N. The photocatalytic efficiency of the best sample (N-2-b-TiO2) for potassium dichromate and rhodamine B was 96.2% and 99.5%, respectively. The superoxide radical (center dot O-2(-)) played a dominant role in photocatalysis by scavenging experiments. Thus, a photocatalytic mechanism with reduced band gap has been proposed. This study provides a simple and practical method for non-metallic doping to control the photocatalytic performance of semiconductors. [GRAPHICS] .
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