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Mullite membrane coatings: antibacterial activities of nanosized TiO2 and Cu-grafted TiO2 in the presence of visible light illumination

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Abstract

Porous mullites used as ceramic membranes were fabricated and coated with TiO2 and 0.1 wt% Cu(II)-grafted TiO2 powders. A spinning coating technique was applied for the coating process. Antibacterial activities of the coated mullites were tested against pathogenic bacteria Escherichia coli (E. coli) by following the experimental methods of ISO 17094:2014 standardized for testing photocatalyst materials under visible light of a florescent lamp as an indoor-tested condition. Mullites without coatings were used as control samples. After 4 h of light exposure, the number of the initially viable bacteria increased significantly for the uncoated mullites and decreased for all of the coated mullites. Coating layers of TiO2 and Cu-grafted TiO2 could inactivate E. coli under light illumination. In dark condition, 0.1 wt% Cu(II)-grafted TiO2 coating on the mullites could inactivate the bacteria, while TiO2 coating on the mullites could not inactivate the bacteria. The experimental results provide a possibility of using the coated mullites for disinfection applications. Bacterial inactivation mechanisms of TiO2 and Cu-grafted TiO2 in coating layers were investigated and discussed in terms of microstructural observation on the coating layers.

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Acknowledgements

This work was supported by the National Metal and Materials Technology Center-National Science and Technology Development Agency (Grant number P-13-00697) and the European Commission under the PCATDES-FP7 (Grant number 309846). Thailand Advanced Institute of Science and Technology and Tokyo Institute of Technology (TAIST-Tokyo Tech) is acknowledged for the scholarship to W. Singhapong.

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Authors and Affiliations

  1. National Metal and Materials Technology Center, National Science and Technology Development Agency, Thailand Science Park, Khlong Nueng, Pathum Thani, 12120, Thailand

    Wadwan Singhapong, Angkhana Jaroenworaluck, Raweewan Pansri, Watchara Chokevivat & Panlekha Manpetch

  2. Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, Bangkok, 10900, Thailand

    Wadwan Singhapong & Penjit Srinophakun

  3. Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Tokyo, 152-8552, Japan

    Masahiro Miyauchi

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  1. Wadwan Singhapong
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Correspondence to Angkhana Jaroenworaluck.

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Singhapong, W., Jaroenworaluck, A., Pansri, R. et al. Mullite membrane coatings: antibacterial activities of nanosized TiO2 and Cu-grafted TiO2 in the presence of visible light illumination. Appl. Phys. A 125, 244 (2019). https://doi.org/10.1007/s00339-019-2526-8

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