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Oxygen Deficient TiO2−x with Dual Reaction Sites for Activation of H2O2 to Degrade Organic Pollutants

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Abstract

The present study reports the development of a novel defective TiO2−x catalyst with oxygen vacancy (OV) which carries dual types of reaction sites for H2O2 activation. The performance of this catalyst on the degradation of organic pollutants was evaluated using organic dyes [such as methyl orange, methylene blue, and rhodamine B (RhB)] as model pollutants. The defects in TiO2−x exhibited a wide pH working window (pH 2–9) for RhB degradation which is wider than that of traditional Fenton systems. Furthermore, this catalyst retained its high catalytic activity even after five cycles. It was confirmed that the surface OV and Ti3+ of TiO2−x served as the active sites for H2O2 activation while the oxygen vacancy promoted adsorption of the organic pollutants, thus enhancing the Fenton-like catalytic performance. The results are applicable to Fenton catalysts via surface engineering and can stimulate new opportunities for the optimization of defect-type Fenton catalysts.

Graphic Abstract

This study, reports the defect of TiO2−x oxygen vacancy (OV) catalyst with oxygen vacancy (OV) which carries dual types of reaction sites for H2O2 activation. The performance of this catalyst on the degradation of organic pollutants was evaluated using organic dyes [such as methyl orange, methylene blue, and rhodamine B (RhB)] as model pollutants. The defects in TiO2−x exhibited a wide pH working window (pH 2–9) for RhB degradation which is wider than that of traditional Fenton systems. Figure shows the schematic of the reaction mechanism. First, H2O2 adsorbs on the TiO2−x surfaces; consequently, the OV and Ti3+ serve as the “Fenton-catalytic” center for H2O2 activation to produce ·OH radicals on the TiO2−x surface. Meanwhile, OV on TiO2−x surface is beneficial for the adsorbed organic pollutants. Because of the generated hydroxyl radical on the TiO2−x surface is very close to the adsorbed pollutant. As a result, the rapid reaction of in situ generated hydroxyl radical with the adsorbed organic pollutants on the TiO2−x surface giving rise to excellent Fenton-like catalytic performance. The proposed overall Fenton-like reaction mechanism on oxygen deficient TiO2−x catalyst.

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Acknowledgements

The authors are thankful for the financial support from the National Natural Science Foundation of China (21273050, 21573048, 21873022, 51574092).

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning, 530006, China

    Jiang-yuan Qiu, Bi-yuan Xiao, Xing-xing Li, Ting Wan, Fang-hong Qin, Yan Mi & Zai-yin Huang

  2. School of Resources, Environment and Materials, ‡Innovation Center for Metal Resources Utilization and Environment Protection, Guangxi University, Nanning, 530004, China

    Jian-hua Chen

  3. Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guangxi University, Nanning, 530004, China

    Jian-hua Chen

  4. The Sixth Geological Brigade of Hubei Geological Bureau, Xiaogan, 432000, China

    Ting Wan

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  1. Jiang-yuan Qiu
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  2. Jian-hua Chen
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  3. Bi-yuan Xiao
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  4. Xing-xing Li
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Correspondence to Yan Mi or Zai-yin Huang.

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Qiu, Jy., Chen, Jh., Xiao, By. et al. Oxygen Deficient TiO2−x with Dual Reaction Sites for Activation of H2O2 to Degrade Organic Pollutants. Catal Lett 150, 222–233 (2020). https://doi.org/10.1007/s10562-019-02920-6

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