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Undulated TiO2−x microtubes modified with multilayer MoS2 nanoflakes for high-performance photocatalytic applications

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Abstract

Due to the wide bandgap, TiO2 has a poor photocatalytic performance under visible light. Both defects and heterojunction can enhance the photocatalytic performance of TiO2; therefore, defects and heterojunction were combined to improve the activity of TiO2 that may be a novelty and feasible strategy. Herein, using the cotton fiber as the template, a special undulated TiO2−x microtube modified with MoS2 nanoflakes was synthesized via sol–gel process, hydrothermal treatment, and solid reduction method successively. The result of XPS and TEM analysis indicated the presence of Ti3+, oxygen vacancies (Ovs), and heterojunction in the TiO2−x/MoS2 composite. TiO2−x/MoS2 had a narrow energy bandgap (1.11 eV) and separated the electron–hole pair effectively. The degradation experiment of methylene blue (MB) under the visible light showed that compared with TiO2 (11.37%) and TiO2/MoS2 (45.81%), the TiO2−x/MoS2 composite had a higher degradation rate (91.32%) within 180 min. Besides, TiO2−x/MoS2 exhibited a higher photocurrent intensity (0.2 μA/cm−2) than TiO2/MoS2 (0.02 μA/cm−2) and TiO2 (0.0032 μA/cm−2). The excellent photocatalytic activity of TiO2−x/MoS2 can be attributed to the synergistic effect of heterojunction and defects, which improved the utilization of visible light significantly.

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The data that support the findings of this study are not publicly available. Data sharing not applicable to this article.

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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Authors and Affiliations

  1. Faculty of Materials and Energy, Southwest University, Chongqing, 400715, China

    **g Huang, Hengshuo Zhang & Zhiqian Chen

  2. School of Materials Science and Engineering, Chongqing University of Arts and Sciences, Chongqing, 402160, China

    **g Huang, Hengshuo Zhang, Wei **ao & Yanhua Zhang

Authors
  1. **g Huang
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  2. Hengshuo Zhang
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  3. Zhiqian Chen
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  4. Wei **ao
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  5. Yanhua Zhang
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Contributions

All authors contributed to the study conception and design. Material preparation and data analysis were performed by JH. Investigation was performed by HZ and ZC. Project supervision, experimental guidance, and theoretical analysis were performed by WZ and YZ. The first draft of the manuscript was written by JH. And all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Wei **ao or Yanhua Zhang.

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Huang, J., Zhang, H., Chen, Z. et al. Undulated TiO2−x microtubes modified with multilayer MoS2 nanoflakes for high-performance photocatalytic applications. J Mater Sci: Mater Electron 33, 18083–18095 (2022). https://doi.org/10.1007/s10854-022-08667-y

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