Visible-light sensitive Cu(II)–TiO2 with sustained anti-viral activity for efficient indoor environmental remediation

Min Liu; Kayano Sunada; Kazuhito Hashimoto; Masahiro Miyauchi

doi:10.1039/C5TA03756E

Visible-light sensitive Cu(ii)–TiO₂ with sustained anti-viral activity for efficient indoor environmental remediation†

Min Liu,^b Kayano Sunada,^b Kazuhito Hashimoto*^bc and Masahiro Miyauchi*^ad

* Corresponding authors

^a Department of Metallurgy and Ceramics Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
E-mail: mmiyauchi@ceram.titech.ac.jp

^b Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan
E-mail: hashimoto@light.t.u-tokyo.ac.jp

^c Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-Ku, Tokyo 113-8656, Japan

^d Japan Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan

Abstract

Visible-light sensitive photocatalysts are desirable for indoor environmental remediation applications. Photocatalysts used for indoor environmental applications must have efficient visible-light activity and sustainable function under dark conditions, as indoor light instruments are typically switched off during the night. Herein, we report the synthesis and optimization of a highly visible-light sensitive Cu(II)–TiO₂ nanocomposite with sustained anti-viral activity under dark conditions. The synthesized Cu(II)–TiO₂ exhibited superior volatile organic compound decomposition and anti-viral activity under visible-light irradiation. Its quantum efficiency for the decomposition of gaseous 2-propanol reached 68.7%. In addition, Cu(II)–TiO₂ completely inactivated the bacteriophage within 30 min of visible-light irradiation. Notably, the Cu(II)–TiO₂ photocatalyst also exhibited sustained anti-viral activity under dark conditions after visible-light irradiation treatment. Taken together, these findings indicate that the prepared Cu(II)–TiO₂ is potentially an effective risk-reduction material for indoor applications.

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Article information

DOI: https://doi.org/10.1039/C5TA03756E
Article type: Paper
Submitted: 24 May 2015
Accepted: 17 Jul 2015
First published: 17 Jul 2015
This article is Open Access

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J. Mater. Chem. A, 2015,3, 17312-17319

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Visible-light sensitive Cu(II)–TiO₂ with sustained anti-viral activity for efficient indoor environmental remediation

M. Liu, K. Sunada, K. Hashimoto and M. Miyauchi, J. Mater. Chem. A, 2015, 3, 17312 DOI: 10.1039/C5TA03756E

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Journal of Materials Chemistry A