Solution conductivity as a factor determining the photocatalytic reaction rate

•The photocatalytic rate decreases with solution conductivity in a hyperbolic fashion.•The decrease of the photocatalytic rate is probably due to the charge loss.•Model describing the dependence of photocatalytic rate and medium conductivity. A rather simple model was developed, which predicted a hy...

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Bibliographic Details
Published in:Journal of photochemistry and photobiology 2024-06, Vol.21, p.100240, Article 100240
Main Authors: Lilov, E., Nedev, S., Lilova, V., Kozhukharov, S., Girginov, Ch
Format: Article
Language:English
Subjects:
Additives
Photocatalytic kinetics
Reaction rate hyperbolic dependence
Reaction rate modeling
Solution conductivity effect
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Summary:•The photocatalytic rate decreases with solution conductivity in a hyperbolic fashion.•The decrease of the photocatalytic rate is probably due to the charge loss.•Model describing the dependence of photocatalytic rate and medium conductivity. A rather simple model was developed, which predicted a hyperbolic relation between the photocatalytic reaction rate and solution conductivity. Experimental validation was performed using methyl orange as a model pollutant and titanium dioxide as a photocatalyst. The experiments, conducted with three different salts confirm the hyperbolic correlation between the photocatalytic degradation rate and solution conductivity. The results have evinced this correlation, albeit the model ignores crucial factors, such as the role of one of the two types of charges generated during light absorption and the chemical decomposition pathway. In addition, the experimentally derived hyperbolic function displays a positive shift along the ordinate. [Display omitted]
ISSN:2666-4690
2666-4690
DOI:10.1016/j.jpap.2024.100240