Abstract
A novel, hydrogel-supported photocatalyst activity indicator, Hpaii, is presented, based on an agar gel
containing the pH indicator dye propyl red (PR), and the photoacid generator, diphenyliodonium nitrate
(DPIN). The latter is broken down when the film is on an active photocatalytic film, and the acid released
protonates the PR, turning the gel from a yellow colour to a red. Initially tested on a TiO2 sol-gel film, the
Hpaii is also shown to be effective in indicating the activity of several different commercially available
photocatalytic surfaces, including: glass, tiles and paint. This is the first example of a water-based
photocatalyst activity indicator ink based on monitoring a photocatalytic process via the change in pH
induced in the indicator films, as revealed by the pH-indicator, propyl red.
Original language | English |
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Pages (from-to) | 390-395 |
Journal | Journal of Photochemistry and Photobiology A: Chemistry |
Volume | 346 |
Early online date | 19 Jun 2017 |
DOIs | |
Publication status | Published - 01 Sept 2017 |
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Novel pH-Based Photocatalyst Activity Indicator Hydrogel Film (Hpaii)
Mills, A. (Creator) & Hawthorne, D. (Creator), Queen's University Belfast, 19 Jun 2017
DOI: 10.17034/d1d25fd0-d67d-4d42-ba92-e0d72da126a1
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