Synergetic catalysis enhancement between H2O2 and TiO2 with single-electron-trapped oxygen vacancy

The TIO 2 -H 2 O 2 system possesses excellent oxidation activity even under dark conditions. However, the mechanism of this process is unclear and inconsistent. In this work, the binary component system containing TiO 2 nanoparticles (NPs) with single electron-trapped oxygen vacancy (SETOV, Vo) and...

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Bibliographic Details
Published in:Nano research 2020-02, Vol.13 (2), p.551-556
Main Authors: Wu, Zhijiao, Guo, Kai, Cao, Shuang, Yao, Wenqing, Piao, Lingyu
Format: Article
Language:English
Subjects:
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Catalysis
Chemistry and Materials Science
Condensed Matter Physics
Electron paramagnetic resonance
Electron spin resonance
Hydrogen peroxide
Irradiation
Light irradiation
Materials Science
Nanoparticles
Nanotechnology
Oxidation
Oxygen
Photocatalysis
Photoelectron spectroscopy
Photoelectrons
Reactive oxygen species
Research Article
Single electrons
Titanium dioxide
Vacancies
X ray photoelectron spectroscopy
X-rays
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Summary:The TIO 2 -H 2 O 2 system possesses excellent oxidation activity even under dark conditions. However, the mechanism of this process is unclear and inconsistent. In this work, the binary component system containing TiO 2 nanoparticles (NPs) with single electron-trapped oxygen vacancy (SETOV, Vo) and H 2 O 2 exhibit excellent oxidative performance for tetracycline, RhB, and MO even without light irradiation. We systematically investigated the mechanism for the high activity of the TIO 2 -H 2 O 2 under dark condition. Reactive oxygen species (ROS) induced from H 2 O 2 play a significant role in improving the catalytic degradation activities. X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) results firstly confirm that H 2 O 2 is primarily activated by SETOVs derived from the TiO 2 NPs through direct contribution of electrons, producing both 02-/·AOOH and ·OH, which are responsible for the excellent reactivity of TiO 2 -H 2 O 2 system. This work not only provides a new perspective on the role of SETOVs playing in the H 2 O 2 activation process, but also expands the application of TiO 2 in environmental conservation.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-020-2650-y