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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 2017-09 -
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.identifier.bibliographicCitation Journal of Photochemistry and Photobiology A: Chemistry, v.346, pp.153 - 158 -
dc.description.isOpenAccess FALSE -
dc.subject.keywordAuthor 4-Chlorophenol -
dc.subject.keywordAuthor Spectral sensitivity -
dc.subject.keywordAuthor Titanium dioxide -
dc.subject.keywordAuthor Photocatalysis -
dc.subject.keywordPlus RELATIVE PHOTONIC EFFICIENCIES -
dc.subject.keywordPlus GAP METAL-OXIDES -
dc.subject.keywordPlus HETEROGENEOUS PHOTOCATALYSIS -
dc.subject.keywordPlus PHOTOCHEMICAL PROCESSES -
dc.subject.keywordPlus TITANIUM-DIOXIDE -
dc.subject.keywordPlus QUANTUM YIELD -
dc.subject.keywordPlus LIGHT-INTENSITY -
dc.subject.keywordPlus TIO2 -
dc.subject.keywordPlus 4-CHLOROPHENOL -
dc.subject.keywordPlus DEGRADATION -
dc.citation.endPage 158 -
dc.citation.startPage 153 -
dc.citation.title Journal of Photochemistry and Photobiology A: Chemistry -
dc.citation.volume 346 -
dc.description.journalRegisteredClass scie -
dc.description.journalRegisteredClass scopus -
dc.relation.journalResearchArea Chemistry -
dc.relation.journalWebOfScienceCategory Chemistry, Physical -
dc.type.docType Article -
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