Photocatalytic hybrid nanocomposites of metal oxide nanoparticles enhanced towards the visible spectral range

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buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage85en_US
dc.citation.spage77en_US
dc.citation.volumeNumber105en_US
dc.contributor.authorPerkgoz, N. K.en_US
dc.contributor.authorToru, R. S.en_US
dc.contributor.authorUnal, E.en_US
dc.contributor.authorSefunc, M.A.en_US
dc.contributor.authorTek, S.en_US
dc.contributor.authorMutlugun, E.en_US
dc.contributor.authorSoganci, I. M.en_US
dc.contributor.authorCeliker, H.en_US
dc.contributor.authorCeliker, G.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.date.accessioned2015-07-28T12:00:00Z
dc.date.available2015-07-28T12:00:00Z
dc.date.issued2011-04-13en_US
dc.departmentDepartment of Physicsen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.departmentNanotechnology Research Center (NANOTAM)en_US
dc.description.abstractWe propose and demonstrate photocatalytic hybrid nanocomposites that co-integrate TiO(2) and ZnO nanoparticles in the same host resin to substantially enhance their combined photocatalytic activity in the near-UV and visible spectral ranges, where the intrinsic photocatalytic activity of TiO2 nanoparticles or that of ZnO nanoparticles is individually considerably weak For a comparative study, by embedding TiO(2) nanoparticles of ca. 6 nm and ZnO nanoparticles of ca. 40 nm in the sol-gel matrix of acrylic resin, we make thin film coatings of TiO(2)-ZnO nanoparticles (combination of TiO2 and ZnO, each with a mass ratio of 8.5%), as well as the composite films of TiO(2) nanoparticles alone (17.0%), and ZnO nanoparticles alone (17.0%), and a negative control group with no nanoparticles. For all of these thin films coated on polyvinyl chloride (PVC) polyester, we experimentally study photocatalytic activity and systematically measure spectral degradation (recovery obtained by photocatalytic reactions). This spectral characterization exhibits photodegradation levels of the contaminant at different excitation wavelengths (in the range of 310-469 nm) to distinguish different parts of optical spectrum where TiO(2) and ZnO nanopartides are individually and concurrently active. We observe that the photocatalytic activity is significantly improved towards the visible range with the use of TiO(2)-ZnO combination compared to the individual cases. Particularly for the excitation wavelengths of photochemical reactions longer than 400 nm, where the negative control group and ZnO nanoparticles alone yield no observable photodegradation level and TiO2 nanoparticles alone lead to a low photodegradation level of 14%, the synergic combination of TiO(2)-ZnO nanoparticles achieves a photodegradation level as high as 30%. Investigating their scanning electron microscopy (SEM), X-ray diffraction (XRD), and high resolution transmission electron microscopy (HRTEM), we present evidence of the heterostructure, crystallography, and chemical bonding states for the hybrid TiO(2)-ZnO nanocomposite films, in comparison to the films of only TiO(2) nanoparticles, only ZnO nanoparticles, and no nanoparticles.en_US
dc.description.provenanceMade available in DSpace on 2015-07-28T12:00:00Z (GMT). No. of bitstreams: 1 10.1016-j.apcatb.2011.03.037.pdf: 1593304 bytes, checksum: f7e626c2b4c947ec91b07c0868b6931b (MD5)en
dc.identifier.doi10.1016/j.apcatb.2011.03.037en_US
dc.identifier.issn0926-3373
dc.identifier.urihttp://hdl.handle.net/11693/12098
dc.language.isoEnglishen_US
dc.publisherElsevieren_US
dc.relation.isversionofhttp://dx.doi.org/doi:10.1016/j.apcatb.2011.03.037en_US
dc.source.titleApplied Catalysis B: Environmentalen_US
dc.subjectImmobilized nanoparticlesen_US
dc.subjectNanocomposite filmsen_US
dc.subjectTitanium dioxideen_US
dc.subjectZinc oxideen_US
dc.subjectPhotocatalytic activityen_US
dc.subjectOptical characterizationen_US
dc.titlePhotocatalytic hybrid nanocomposites of metal oxide nanoparticles enhanced towards the visible spectral rangeen_US
dc.typeArticleen_US

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Department of Physics
Department of Electrical and Electronics Engineering
Institute of Materials Science and Nanotechnology (UNAM)
Nanotechnology Research Center (NANOTAM)