Cu-Doped TiO2: Visible light assisted photocatalytic antimicrobial activity

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dc.contributor.authorMathew, Snehamol
dc.contributor.authorGanguly, Priyanka
dc.contributor.authorRhatigan, Stephen
dc.contributor.authorKumaravel, Vignesh
dc.contributor.authorByrne, Ciara
dc.contributor.authorHinder, Steven J.
dc.contributor.authorBartlett, John
dc.contributor.authorNolan, Michael
dc.contributor.authorPillai, Suresh C.
dc.contributor.funderEuropean Union INTERREG VAen
dc.contributor.funderDepartment of Jobs, Enterprise and Innovationen
dc.contributor.funderDepartment for the Economy (DfE)en
dc.contributor.funderInstitute of Technology Sligoen
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderHorizon 2020en
dc.date.accessioned2019-09-02T14:36:13Z
dc.date.available2019-09-02T14:36:13Z
dc.date.issued2018-10-26
dc.description.abstractSurface contamination by microbes is a major public health concern. A damp environment is one of potential sources for microbe proliferation. Smart photocatalytic coatings on building surfaces using semiconductors like titania (TiO2) can effectively curb this growing threat. Metal-doped titania in anatase phase has been proven as a promising candidate for energy and environmental applications. In this present work, the antimicrobial efficacy of copper (Cu)-doped TiO2 (Cu-TiO2) was evaluated against Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive) under visible light irradiation. Doping of a minute fraction of Cu (0.5 mol %) in TiO2 was carried out via sol-gel technique. Cu-TiO2 further calcined at various temperatures (in the range of 500–700 °C) to evaluate the thermal stability of TiO2 anatase phase. The physico-chemical properties of the samples were characterized through X-ray diffraction (XRD), Raman spectroscopy, X-ray photo-electron spectroscopy (XPS) and UV–visible spectroscopy techniques. XRD results revealed that the anatase phase of TiO2 was maintained well, up to 650 °C, by the Cu dopant. UV–vis results suggested that the visible light absorption property of Cu-TiO2 was enhanced and the band gap is reduced to 2.8 eV. Density functional theory (DFT) studies emphasize the introduction of Cu+ and Cu2+ ions by replacing Ti4+ ions in the TiO2 lattice, creating oxygen vacancies. These further promoted the photocatalytic efficiency. A significantly high bacterial inactivation (99.9999%) was attained in 30 min of visible light irradiation by Cu-TiO2.en
dc.description.sponsorshipIVA5033; PPRES052; PPRES032; SFI/US/14/e2915; SFI/16/M-ERA/3418en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid2067en
dc.identifier.citationMathew, S., Ganguly, P., Rhatigan, S., Kumaravel, V., Byrne, C., Hinder, S., Bartlett, J., Nolan, M. and Pillai, S., 2018. Cu-doped TiO2: visible light assisted photocatalytic antimicrobial activity. Applied Sciences, 8(11), (2067). DOI:10.3390/app8112067en
dc.identifier.doi10.3390/app8112067en
dc.identifier.endpage20en
dc.identifier.issn2076-3417
dc.identifier.issued11en
dc.identifier.journaltitleApplied Sciences (Switzerland)en
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/8433
dc.identifier.volume8en
dc.language.isoenen
dc.publisherMDPI AGen
dc.relation.projectinfo:eu-repo/grantAgreement/EC/H2020::ERA-NET-Cofund/685451/EU/ERA-NET for materials research and innovation/M-ERA.NET 2en
dc.relation.urihttps://www.mdpi.com/2076-3417/8/11/2067
dc.rights© 2018 by the authors. Licensee MDPI, Basel, Switzerlanden
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subjectCu-doped TiO2en
dc.subjectDopingen
dc.subjectPhase transitionen
dc.subjectEscherichia colien
dc.subjectStaphylococcus aureusen
dc.subjectPhotocatalysisen
dc.subjectAntibacterial coatingsen
dc.titleCu-Doped TiO2: Visible light assisted photocatalytic antimicrobial activityen
dc.typeArticle (peer-reviewed)en
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