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dc.contributor.authorJiang, DL
dc.contributor.authorZhao, HJ
dc.contributor.authorZhang, SQ
dc.contributor.authorJohn, R
dc.contributor.editorE. Iglesia
dc.date.accessioned2017-05-03T11:43:12Z
dc.date.available2017-05-03T11:43:12Z
dc.date.issued2004
dc.date.modified2009-10-02T06:04:41Z
dc.identifier.issn0021-9517
dc.identifier.doi10.1016/j.jcat.2004.01.030
dc.identifier.urihttp://hdl.handle.net/10072/5279
dc.description.abstractA unique transient photoelectrolysis technique was developed to study the photocatalytic oxidation kinetics of adsorbed organic compounds at particulate TiO2 film electrodes. The technique was employed to study the photocatalytic oxidation of a number of adsorbed dicarboxylic acids at TiO2 porous film electrodes. The adsorption of these compounds was found to be heterogeneous, with three major types of surface complexes identified-each having distinctive binding affinities to the TiO2 surface. The three thermodynamically distinctive types of surface complexes exhibit two measurable photocatalytic reaction kinetic characteristics, i.e., a fast process and a slow process. The fast kinetic process can be attributed to the photocatalytic degradation of the strongest adsorbed species at more active sites such as edge and corner titanium ions. The slow kinetic process can be attributed to the photocatalytic degradation of the medium-strength bound complexes and the weakest bound surface complexes. The rate constants for these processes were calculated by curve fitting the photocurrent transient response to a double exponential decay expression. For adsorbed oxalic acid both the fast and the slow processes were shown to be the first-order processes in which both rate constants were independent of surface coverage. For the larger dicarboxylic acids adsorbed, the rate constant for the fast photocatalytic process (kf) was found to decrease with an increase in the surface coverage. The rate constant for the slow photocatalytic process, however, was shown to be a true first-order process for all adsorbed dicarboxylic acids. The value of the rate constant (ks) was similar for all the adsorbates studied and was independent of the surface coverage.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.languageEnglish
dc.language.isoeng
dc.publisherAcademic Press Inc, Elsevier Science
dc.publisher.placeSan Diego, USA
dc.publisher.urihttp://www.elsevier.com/wps/find/journaldescription.cws_home/622858/description#description
dc.relation.ispartofpagefrom212
dc.relation.ispartofpageto220
dc.relation.ispartofjournalJournal of Catalysis
dc.relation.ispartofvolume223
dc.subject.fieldofresearchPhysical chemistry
dc.subject.fieldofresearchChemical engineering
dc.subject.fieldofresearchInorganic chemistry
dc.subject.fieldofresearchcode3406
dc.subject.fieldofresearchcode4004
dc.subject.fieldofresearchcode3402
dc.titleKinetic study of photocatalytic oxidation of adsorbed carboxylic acids at TiO2 porous films by photoelectrolysis
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.facultyGriffith Sciences, Griffith School of Environment
gro.date.issued2004
gro.hasfulltextNo Full Text
gro.griffith.authorZhao, Huijun
gro.griffith.authorJohn, Richard


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