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Fabrication of TiO2-SrCO3 Composite Coatings by Suspension Plasma Spraying: Microstructure and Enhanced Visible Light Photocatalytic Performances

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Abstract

A novel TiO2-SrCO3 co-catalyst with a porous structure was fabricated by suspension plasma spraying. SrTiO3 as revealed by high-resolution TEM was formed by the chemical reaction of TiO2 with SrCO3 during the high-temperature plasma spraying. A narrow band gap (2.58 eV) and reduction in the recombination speed of photoinduced carriers of the coatings were detected by UV–visible diffuse reflectance spectrometry and fluorescence spectrometry, respectively. The enhanced visible light-driven photodegradation properties of the coatings resulted in promoted degradation of methylene blue. The composite coatings also demonstrated significantly pronounced bactericidal activities against the Gram-negative bacterium Escherichia coli than the pure TiO2 coatings, achieving a killing rate of over 99.7%. The results give insights on the potential to fabricate large-scale nano-TiO2-based porous photocatalytic coatings by suspension plasma spraying for versatile environmental applications.

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Acknowledgments

This work was supported by Key Research and Development Program of Zhejiang Province (Grant # 2017C01003), National Science Foundation of China (Grant # 31500772), Zhejiang Provincial Natural Science Foundation of China (Grant # LY18C100003) and International Scientific and Technological Cooperation Project of Ningbo (Grant # 2017D10011).

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Authors and Affiliations

  1. Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo, 315211, Zhejiang, China

    Mengjiao Zhai

  2. Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China

    Mengjiao Zhai, Yi Liu, Jing Huang, Wenjia Hou, Songze Wu, Botao Zhang & Hua Li

  3. Cixi Institute of Biomedical Engineering, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China

    Mengjiao Zhai, Yi Liu, Jing Huang, Wenjia Hou, Songze Wu, Botao Zhang & Hua Li

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  1. Mengjiao Zhai
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Zhai, M., Liu, Y., Huang, J. et al. Fabrication of TiO2-SrCO3 Composite Coatings by Suspension Plasma Spraying: Microstructure and Enhanced Visible Light Photocatalytic Performances. J Therm Spray Tech 29, 1172–1182 (2020). https://doi.org/10.1007/s11666-020-01022-9

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