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Vis-Responsive Copper-Modified Titania for Decomposition of Organic Compounds and Microorganisms

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Title: Vis-Responsive Copper-Modified Titania for Decomposition of Organic Compounds and Microorganisms
Authors: Endo-Kimura, Maya Browse this author
Karabiyik, Baris Browse this author
Wang, Kunlei Browse this author
Wei, Zhishun Browse this author
Ohtani, Bunsho Browse this author →KAKEN DB
Markowska-Szczupak, Agata Browse this author
Kowalska, Ewa Browse this author →ORCID
Keywords: copper-modified titania
plasmonic photocatalysts
heterogeneous photocatalysis
bactericidal activity
antifungal effect
Issue Date: Oct-2020
Publisher: MDPI
Journal Title: Catalysts
Volume: 10
Issue: 10
Start Page: 1194
Publisher DOI: 10.3390/catal10101194
Abstract: Seven commercial titania (titanium(IV) oxide; TiO2) powders with different structural properties and crystalline compositions (anatase/rutile) were modified with copper by two variants of a photodeposition method, i.e., methanol dehydrogenation and water oxidation. The samples were characterized by diffuse reflectance spectroscopy (DRS), X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). Although zero-valent copper was deposited on the surface of titania, oxidized forms of copper, post-formed in ambient conditions, were also detected in dried samples. All samples could absorb visible light (vis), due to localized surface plasmon resonance (LSPR) of zero-valent copper and by other copper species, including Cu2O, CuO and CuxO (x:1-2). The photocatalytic activities of samples were investigated under both ultraviolet (UV) and visible light irradiation (>450 nm) for oxidative decomposition of acetic acid. It was found that titania modification with copper significantly enhanced the photocatalytic activity, especially for anatase samples. The prolonged irradiation (from 1 to 5 h) during samples' preparation resulted in aggregation of copper deposits, thus being detrimental for vis activity. It is proposed that oxidized forms of copper are more active under vis irradiation than plasmonic one. Antimicrobial properties against bacteria (Escherichia coli) and fungi (Aspergillus niger) under vis irradiation and in the dark confirmed that Cu/TiO2 exhibits a high antibacterial effect, mainly due to the intrinsic activity of copper species.
Type: article
Appears in Collections:触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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