Modelling the kinetics of stearic acid destruction on TiO2 ‘self-cleaning’ photocatalytic films

Saleh Alofi; Christopher O'Rourke; Andrew Mills

doi:10.1016/j.apcata.2022.118899

Modelling the kinetics of stearic acid destruction on TiO₂ ‘self-cleaning’ photocatalytic films

Saleh Alofi, Christopher O'Rourke, Andrew Mills^*

^*Corresponding author for this work

School of Chemistry and Chemical Engineering

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

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Abstract

The kinetics of stearic acid, SA, removal by photocatalytic films are modelled using a log-normal distribution in surface reactivity, which shows that as the distribution in reactivity, ρ, increases, so too does the apparent order of reaction, m, of the observed variation in SA concentration, [SA], versus irradiation time, t. The model is used to fit the observed [SA] vs. t profiles exhibited by three very different TiO2 films, namely Activ™ self-cleaning glass, and prepared sol-gel TiO₂ and P25 TiO₂ films. These films show decay kinetics, with m = 0.3, 0.44 and 0.6, respectively, which fit the model predicted decay profiles for distribution width, ρ, values, 0.4, 0.54 and 0.7, respectively. A Ag photocatalyst indicator ink is used on these films to highlight the non-uniform distribution in surface reactivity on the micron scale. The use of the log-normal model to better understand the kinetics exhibited by photocatalytic films is discussed briefly.

Original language	English
Article number	118899
Number of pages	10
Journal	Applied Catalysis A: General
Volume	647
Early online date	14 Oct 2022
DOIs	https://doi.org/10.1016/j.apcata.2022.118899
Publication status	Published - 25 Oct 2022

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Modelling the kinetics of stearic acid destruction on TiO2 ‘self-cleaning’ photocatalytic films
Copyright 2022 the authors. This is an open access article published under a Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Final published version, 4.02 MBLicence: CC BY

Investigation of inorganic photocatalytic systems
Alofi, S. (Author), Mills, A. (Supervisor), Nockemann, P. (Supervisor) & De Silva, A. (Supervisor), Dec 2024
Student thesis: Doctoral Thesis › Doctor of Philosophy

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title = "Modelling the kinetics of stearic acid destruction on TiO2 {\textquoteleft}self-cleaning{\textquoteright} photocatalytic films",

abstract = "The kinetics of stearic acid, SA, removal by photocatalytic films are modelled using a log-normal distribution in surface reactivity, which shows that as the distribution in reactivity, ρ, increases, so too does the apparent order of reaction, m, of the observed variation in SA concentration, [SA], versus irradiation time, t. The model is used to fit the observed [SA] vs. t profiles exhibited by three very different TiO2 films, namely Activ{\texttrademark} self-cleaning glass, and prepared sol-gel TiO2 and P25 TiO2 films. These films show decay kinetics, with m = 0.3, 0.44 and 0.6, respectively, which fit the model predicted decay profiles for distribution width, ρ, values, 0.4, 0.54 and 0.7, respectively. A Ag photocatalyst indicator ink is used on these films to highlight the non-uniform distribution in surface reactivity on the micron scale. The use of the log-normal model to better understand the kinetics exhibited by photocatalytic films is discussed briefly.",

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N2 - The kinetics of stearic acid, SA, removal by photocatalytic films are modelled using a log-normal distribution in surface reactivity, which shows that as the distribution in reactivity, ρ, increases, so too does the apparent order of reaction, m, of the observed variation in SA concentration, [SA], versus irradiation time, t. The model is used to fit the observed [SA] vs. t profiles exhibited by three very different TiO2 films, namely Activ™ self-cleaning glass, and prepared sol-gel TiO2 and P25 TiO2 films. These films show decay kinetics, with m = 0.3, 0.44 and 0.6, respectively, which fit the model predicted decay profiles for distribution width, ρ, values, 0.4, 0.54 and 0.7, respectively. A Ag photocatalyst indicator ink is used on these films to highlight the non-uniform distribution in surface reactivity on the micron scale. The use of the log-normal model to better understand the kinetics exhibited by photocatalytic films is discussed briefly.

AB - The kinetics of stearic acid, SA, removal by photocatalytic films are modelled using a log-normal distribution in surface reactivity, which shows that as the distribution in reactivity, ρ, increases, so too does the apparent order of reaction, m, of the observed variation in SA concentration, [SA], versus irradiation time, t. The model is used to fit the observed [SA] vs. t profiles exhibited by three very different TiO2 films, namely Activ™ self-cleaning glass, and prepared sol-gel TiO2 and P25 TiO2 films. These films show decay kinetics, with m = 0.3, 0.44 and 0.6, respectively, which fit the model predicted decay profiles for distribution width, ρ, values, 0.4, 0.54 and 0.7, respectively. A Ag photocatalyst indicator ink is used on these films to highlight the non-uniform distribution in surface reactivity on the micron scale. The use of the log-normal model to better understand the kinetics exhibited by photocatalytic films is discussed briefly.

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Modelling the kinetics of stearic acid destruction on TiO2 ‘self-cleaning’ photocatalytic films

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Investigation of inorganic photocatalytic systems

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Modelling the kinetics of stearic acid destruction on TiO₂ ‘self-cleaning’ photocatalytic films