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dc.contributor.author Lee, S.-K. -
dc.contributor.author Mills, A. -
dc.contributor.author O'Rourke, C. -
dc.date.available 2017-08-10T08:19:02Z -
dc.date.created 2017-08-09 -
dc.date.issued 2017 -
dc.identifier.citation Journal of Photochemistry and Photobiology A: Chemistry, v.346, pp.153 - 158 -
dc.identifier.issn 1010-6030 -
dc.identifier.uri http://hdl.handle.net/20.500.11750/4264 -
dc.description.abstract The photocatalysed mineralisation of 4-chlorophenol, 4-CP, by P25 TiO2 is a well-studied photocatalytic system. A previous paper (Emeline et al., J. Phys. Chem. B, 2000, 104, 11202) reported an action spectrum, i.e. photonic efficiency, η, vs. excitation wavelength, λ(ex), for the P25/4-CP system, that exhibited a series of peaks and troughs which, it was proposed, provided evidence of P25 spectral sensitivity. However, in this re-examination it is shown that the peaks and troughs in the action spectrum occur in the regions of the troughs and peaks in the emission spectrum of the Xe/Hg lamp used by these researchers. The dependencies of η, and quantum yield, ϕ, upon incident light intensity, ρ, in semiconductor-sensitised photocatalytic systems are considered and a rationale provided that suggests the action spectrum reported by Emerline et al. is actually due to the variation in ρ in the emission spectrum of the Xe/Hg lamp. In order to test the latter hypothesis, the action spectrum of the same P25/4-CP system is determined, but this time using a Xe lamp; the latter action spectrum has no peaks and troughs and corresponds closely to that of the diffuse reflectance spectrum of the P25 dispersion as expected if there is no spectral sensitivity. This action spectrum, and similar results reported by others for this and other test pollutants, provides strong evidence that the claim of spectral sensitivity for the P25/4-CP system is unjustified, based on the reported action spectrum of Emeline et al., since the latter is due to the spectral variation in irradiance of the Xe/Hg excitation source employed in the original study. © 2017 Elsevier B.V. -
dc.language English -
dc.publisher Elsevier B.V. -
dc.title The P25 TiO2/4-chlorophenol photocatalytic system: Spectral sensitivity or lamp artefact? -
dc.type Article -
dc.identifier.doi 10.1016/j.jphotochem.2017.05.018 -
dc.identifier.wosid 000407526200016 -
dc.identifier.scopusid 2-s2.0-85020686336 -
dc.type.local Article(Overseas) -
dc.type.rims ART -
dc.description.journalClass 1 -
dc.citation.publicationname Journal of Photochemistry and Photobiology A: Chemistry -
dc.contributor.nonIdAuthor Mills, A. -
dc.contributor.nonIdAuthor O'Rourke, C. -
dc.identifier.citationVolume 346 -
dc.identifier.citationStartPage 153 -
dc.identifier.citationEndPage 158 -
dc.identifier.citationTitle Journal of Photochemistry and Photobiology A: Chemistry -
dc.type.journalArticle Article -
dc.description.isOpenAccess N -
dc.contributor.affiliatedAuthor Lee, S.-K. -
dc.contributor.affiliatedAuthor Mills, A. -
dc.contributor.affiliatedAuthor O'Rourke, C. -
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