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Hollow Plasma-Sprayed Spherical Nanostructured Titania Feedstock for Photocatalytic Applications

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Abstract

There have been persistent challenges in thermal spraying of nanoparticles feedstock for making nanostructured coatings with desired mechanical strength. Here we report fabrication of nanostructured titania coatings by atmospheric plasma spraying of hollow titania spheres, and microstructures and photocatalytic activities of the coatings are examined. The hollow microspheres are ~ 50 μm in diameter and possess a mesoporous shell of 1-3 μm in thickness. The coatings show micro-nano hybrid structures with well-retained titania nanoparticles and agglomerated granules. High anatase content is achieved in the coatings, suggesting that constrained heating of the particles effectively prevents the transformation from anatase to rutile. The spherical characteristics of the organic materials in the feedstock powder play dominant roles in regulating the physicochemical characteristics of the coatings for photocatalytic performances. These results would provide insight into large-scale thermal spray fabrication of nanostructured coatings using appropriately designed hollow spherical powder.

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Acknowledgments

This work was supported by Key Research and Development Program of Zhejiang Province (2017C01003), National Natural Science Foundation of China (31500772 and 41476064), International Scientific and Technological Cooperation Project of Ningbo (2016D10012), China Postdoctoral Science Foundation (2017M622542), and Hubei Postdoctoral Sustentation Foundation (G22).

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Authors and Affiliations

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

    Xiaoyan He, Kun Ren, Yi Liu, Jing Huang & Hua Li

  2. Reliability Engineering Institute, National Engineering Research Center for Water Transport Safety, Wuhan University of Technology, Wuhan, 430063, China

    Xiaoyan He

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  1. Xiaoyan He
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  2. Kun Ren
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  3. Yi Liu
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  4. Jing Huang
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  5. Hua Li
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Correspondence to Hua Li.

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He, X., Ren, K., Liu, Y. et al. Hollow Plasma-Sprayed Spherical Nanostructured Titania Feedstock for Photocatalytic Applications. J Therm Spray Tech 27, 1532–1541 (2018). https://doi.org/10.1007/s11666-018-0788-x

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  • DOI: https://doi.org/10.1007/s11666-018-0788-x

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