Kinetics of methylene blue (MB) photocatalyzed reduction and dark regeneration in a colorimetric oxygen sensor

David Ollis, Andrew Mills, Katherine Lawrie

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Performance data for a dye based, regenerable oxygen sensor (Mills and Lawrie [1], Mills et al. [2]) are analyzed to develop useful kinetic models for sensor photoactivation (dye reduction) and dark, oxygen detection (dye oxidation). The titania loaded, thin film sensor exhibits an apparent first order photoactivation of the dye, which we demonstrate (Section 3.2 and Fig. 4) is due to a kinetic disguise of a zero order photoreaction occurring through a non-uniformly illuminated sensor film. The observed zero order, slow recovery due to dye oxidation by dioxygen (O2 detection) appears best rationalized by a model assuming a near O2-impermeable skin developing on the sensor surface as solvent is evaporatively removed following sensor film casting and curing.
Original languageEnglish
Pages (from-to)201-207
Number of pages7
JournalApplied Catalysis B: Environmental
Volume184
Early online date30 Nov 2015
DOIs
Publication statusPublished - 05 May 2016

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