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Volume 13
Issue 4
10.3390/catal13040725
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Article

PiFM and XPS Studies of Porous TiO2 Films for the Photocatalytic Decomposition of Polystyrene

by
Christopher Court-Wallace
,
Philip R. Davies
*,
Josh Davies-Jones
and
Genevieve Ososki
Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff CF10 3AT, UK
*
Author to whom correspondence should be addressed.
Catalysts 2023, 13(4), 725; https://doi.org/10.3390/catal13040725
Submission received: 10 March 2023 / Revised: 29 March 2023 / Accepted: 31 March 2023 / Published: 11 April 2023
(This article belongs to the Section Photocatalysis)
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Abstract

The rate of photocatalytic oxidation of polystyrene over 0.1 wt% copper-doped TiO2 catalyst spin coated onto a flat substrate is investigated as a function of the catalyst deposition spin speed and, hence, film thickness. Photoinduced force microscopy and photoelectron spectroscopy show no evidence of any products of the photocatalytic oxidation remaining on the surface after reaction. The oxidation reaction shows no discernible dependence on spin speed; it is close to zero order in polystyrene concentration and exhibits a ½ life almost 50 times greater than the equivalent photocatalytic oxidation of stearic acid on the same catalysts. No difference between the rate of decay of the aliphatic and aromatic hydrogens of the polymer was observed, suggesting that once a polymer chain begins oxidising, subsequent steps are relatively rapid. This is consistent with the rate-determining step being dependent on the extent of coordination to the surface, which is much more favourable with stearic acid because of its carboxylic group.
Keywords: polystyrene; photocatalysis; surface; TiO2; spin coating polystyrene; photocatalysis; surface; TiO2; spin coating

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MDPI and ACS Style

Court-Wallace, C.; Davies, P.R.; Davies-Jones, J.; Ososki, G. PiFM and XPS Studies of Porous TiO2 Films for the Photocatalytic Decomposition of Polystyrene. Catalysts 2023, 13, 725. https://doi.org/10.3390/catal13040725

AMA Style

Court-Wallace C, Davies PR, Davies-Jones J, Ososki G. PiFM and XPS Studies of Porous TiO2 Films for the Photocatalytic Decomposition of Polystyrene. Catalysts. 2023; 13(4):725. https://doi.org/10.3390/catal13040725

Chicago/Turabian Style

Court-Wallace, Christopher, Philip R. Davies, Josh Davies-Jones, and Genevieve Ososki. 2023. "PiFM and XPS Studies of Porous TiO2 Films for the Photocatalytic Decomposition of Polystyrene" Catalysts 13, no. 4: 725. https://doi.org/10.3390/catal13040725

APA Style

Court-Wallace, C., Davies, P. R., Davies-Jones, J., & Ososki, G. (2023). PiFM and XPS Studies of Porous TiO2 Films for the Photocatalytic Decomposition of Polystyrene. Catalysts, 13(4), 725. https://doi.org/10.3390/catal13040725

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