Kinetics of reduction of a Resazurin-based photocatalytic activity ink
MacKenzie, John and MacDonald, Grant and Mills, Andrew and Wells, Nathan (2017) Kinetics of reduction of a Resazurin-based photocatalytic activity ink. Catalysis Today, 281 (1). pp. 14-20. ISSN 0920-5861
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Abstract
The kinetics of reduction of a Resazurin, Rz,-based photocatalyst activity indicator ink, paii, on a commercial sample of self-cleaning glass, Activ™ is examined; the latter has ca. a 15nm compact coating of anatase TiO2 which serves as the active photocatalyst layer. The rate of dye reduction is reduced significantly by the presence of ambient O2. In the absence of O2, the measured change in film absorbance due to Rz, d Δ Abs/dt, was found to be independent of both [Rz] and film thickness, b. It is shown that this translates to the rate of dye reduction, d[Rz]/dt, being independent of the concentration of the Rz in the ink film, [Rz], and inversely proportional to film thickness, b. The observed kinetics are rationalised in terms of a kinetic model in which the rate determining step is the reduction of photocatalyst surface-adsorbed Rz by photo-generated surface electrons, with all photocatalyst surface sites occupied by Rz. Further work suggests that, if the kinetics of the photocatalysed reduction of the Rz paii were diffusion-controlled, then the decay in [Rz] would be first order and dependent upon b-2.
ORCID iDs
MacKenzie, John ORCID: https://orcid.org/0000-0003-4412-7057, MacDonald, Grant ORCID: https://orcid.org/0000-0001-6318-3340, Mills, Andrew and Wells, Nathan;-
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Item type: Article ID code: 56622 Dates: DateEvent1 March 2017Published3 June 2016AcceptedSubjects: Science > Chemistry Department: Faculty of Science > Mathematics and Statistics Depositing user: Pure Administrator Date deposited: 07 Jun 2016 15:14 Last modified: 02 Oct 2024 00:26 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/56622