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Open AccessFeature PaperReview

Antiviral Effect of Visible Light-Sensitive CuxO/TiO2 Photocatalyst

1
Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
2
Kanagawa Institute of Industrial Science and Technology (KISTEC), 3-25-13, Tonomachi, Kawasaki, Kanagawa 210-0821, Japan
3
National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
*
Authors to whom correspondence should be addressed.
Catalysts 2020, 10(9), 1093; https://doi.org/10.3390/catal10091093
Received: 1 September 2020 / Revised: 15 September 2020 / Accepted: 18 September 2020 / Published: 21 September 2020
Photocatalysis is an effective technology for preventing the spread of pandemic-scale viruses. This review paper presents an overview of the recent progress in the development of an efficient visible light-sensitive photocatalyst, i.e., a copper oxide nanoclusters grafted titanium dioxide (CuxO/TiO2). The antiviral CuxO/TiO2 photocatalyst is functionalised by a different mechanism in addition to the photocatalytic oxidation process. The CuxO nanocluster consists of the valence states of Cu(I) and Cu(II); herein, the Cu(I) species denaturalizes the protein of the virus, thereby resulting in significant antiviral properties even under dark conditions. Moreover, the Cu(II) species in the CuxO nanocluster serves as an electron acceptor through photo-induced interfacial charge transfer, which leads to the formation of an anti-virus Cu(I) species and holes with strong oxidation power in the valence band of TiO2 under visible-light irradiation. The antiviral function of the CuxO/TiO2 photocatalyst is maintained under indoor conditions, where light illumination is enabled during the day but not during the night; this is because the remaining active Cu(I) species works under dark conditions. The CuxO/TiO2 photocatalyst can thus be used to reduce the risk of virus infection by acting as an antiviral coating material. View Full-Text
Keywords: photocatalysis; antiviral; visible light; copper oxide; titanium dioxide; interfacial charge transfer; SARS-CoV-2 photocatalysis; antiviral; visible light; copper oxide; titanium dioxide; interfacial charge transfer; SARS-CoV-2
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MDPI and ACS Style

Miyauchi, M.; Sunada, K.; Hashimoto, K. Antiviral Effect of Visible Light-Sensitive CuxO/TiO2 Photocatalyst. Catalysts 2020, 10, 1093.

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