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Undulated TiO microtubes modified with multilayer MoS nanoflakes for high-performance photocatalytic applications

Journal of Materials Science: Materials in Electronics, ISSN: 1573-482X, Vol: 33, Issue: 22, Page: 18083-18095
2022
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Article Description

Due to the wide bandgap, TiO has a poor photocatalytic performance under visible light. Both defects and heterojunction can enhance the photocatalytic performance of TiO; therefore, defects and heterojunction were combined to improve the activity of TiO that may be a novelty and feasible strategy. Herein, using the cotton fiber as the template, a special undulated TiO microtube modified with MoS 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 Ti, oxygen vacancies (Ovs), and heterojunction in the TiO/MoS composite. TiO/MoS 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 TiO (11.37%) and TiO/MoS (45.81%), the TiO/MoS composite had a higher degradation rate (91.32%) within 180 min. Besides, TiO/MoS exhibited a higher photocurrent intensity (0.2 μA/cm) than TiO/MoS (0.02 μA/cm) and TiO (0.0032 μA/cm). The excellent photocatalytic activity of TiO/MoS can be attributed to the synergistic effect of heterojunction and defects, which improved the utilization of visible light significantly.

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