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Research Article

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

Zhijiao Wu1,§, Kai Guo1,4,§, Shuang Cao1( ), Wenqing Yao3( ), Lingyu Piao1,2( )
CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Department of Chemistry, Tsinghua University, Beijing 100084, China
University of Chinese Academy of Sciences, Beijing 100049, China

§ Zhijiao Wu and Kai Guo contributed equally to this work.

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Graphical Abstract

Abstract

The TiO2-H2O2 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 TiO2 nanoparticles (NPs) with single electron-trapped oxygen vacancy (SETOV, VO·) and H2O2 exhibit excellent oxidative performance for tetracycline, RhB, and MO even without light irradiation. We systematically investigated the mechanism for the high activity of the TiO2-H2O2 under dark condition. Reactive oxygen species (ROS) induced from H2O2 play a significant role in improving the catalytic degradation activities. X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) results firstly confirm that H2O2 is primarily activated by SETOVs derived from the TiO2 NPs through direct contribution of electrons, producing both ·O2-/·OOH and ·OH, which are responsible for the excellent reactivity of TiO2-H2O2 system. This work not only provides a new perspective on the role of SETOVs playing in the H2O2 activation process, but also expands the application of TiO2 in environmental conservation.

Keywords

single-electron-trapped oxygen vacancyTiO2 nanoparticleH2O2dark reactionsuperoxide radicalshydroxyl radical

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Nano Research
Volume 13 Issue 2,
February 2020
Pages 551-556
DOI: 10.1007/s12274-020-2650-y
Cite this article:
Wu Z, Guo K, Cao S, et al. Synergetic catalysis enhancement between H2O2 and TiO2 with single-electron-trapped oxygen vacancy. Nano Research, 2020, 13(2): 551-556. https://doi.org/10.1007/s12274-020-2650-y
Topics:
Catalyst activityElectron spin resonance spectroscopyElectronsNanoparticlesRhodium compoundsTiO2 nanoparticlesTitanium DioxideX-ray photoelectron spectroscopy

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Received: 04 November 2019
Revised: 27 December 2019
Accepted: 08 January 2020
Published: 23 January 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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