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A critical structured TiO2 with enhanced photocatalytic activity during the formation of yolk-shell structured TiO2

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Abstract

Yolk-shell structured TiO2 microspheres were synthesized by using a facile hydrothermal method with ammonium chloride (NH4Cl) as additive. Ostwald ripening mechanism was proposed to explain the growth of yolk-shell structured TiO2 by conducting a series of time-dependent experiments, where the solid microspheres, narrow-band-like structured, wide-band-like structured and shedding structured samples were obtained. The as-synthesized samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller analysis (BET) and UV–Vis spectra. BET results showed that the as-synthesized powders displayed bimodal pore size distributions and the wide-band-like structured sample had the largest specific surface area. The photocatalytic efficiency of Rhodamine B (RhB) achieved 99.24% for wide-band-like structured TiO2 photocatalyst, under 500 W Xe lamp irradiation, indicating that the increase of 28.0%, 11.3%, 12.2% and 7.41% was achievd compared to the photocatalytic efficiency of solid microspheres (77.53%), narrow-band-like structured (89.17%), shedding-shell structured TiO2 (88.42%) and Degussa P25 (91.89%) as photocatalysts, respectively.

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Acknowledgements

The authors gratefully acknowledge the financial support from National Natural Science Foundation of China (51874200), Liaoning Province College Innovative Talents Fund Project (LR2016052), Liaoning Bai Qian Wan Talents Program and the Natural Science Foundation of Liaoning Province (2015020229).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870, Liaoning, China

    Hao Yang, Mingchun Li, Shengfei Li, Aili Tao & Yusheng Wu

Authors
  1. Hao Yang
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  2. Mingchun Li
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  3. Shengfei Li
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  4. Aili Tao
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  5. Yusheng Wu
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Correspondence to Mingchun Li.

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Yang, H., Li, M., Li, S. et al. A critical structured TiO2 with enhanced photocatalytic activity during the formation of yolk-shell structured TiO2. J Mater Sci: Mater Electron 31, 2–9 (2020). https://doi.org/10.1007/s10854-018-9986-z

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  • DOI: https://doi.org/10.1007/s10854-018-9986-z

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