How are the reactive species trapping experiments performed in gas phase photocatalysis?
For example, the article: Applied Catalysis B: Environmental 214 (2017) 46–56 stated that:
"To further investigate whether the reversion of the semiconducting behavior would affect the photocatalytic removal pathway of NO, active species trapping experiments were carried out. In these trapping experiments, potassium iodide (KI), potassiumdichromate (K2Cr2O7), tert-butyl alcohol (TBA), and p-benzoquinone (PBQ) were selected to trap the photogenerated holes, electrons, hydroxide radical (•OH), and superoxide anion radical (•O2•) species, respectively."
The trapping agents are not in gas phase, therefore how can they be used as trapping agents in a gas phase experiment?
Thank you everyone
In these type of experiments the trapping of the reactive species happens on the surface of a semiconductor, but not in the gas phase.
As Prof. Yurii highlighted, the photocatalytic processes including adsorption, activation and subsequent conversion occur at the photocatalyst surface (a place where active species are produced).
Dear Prof. Yurii V Geletii and Mahmoud Sayed
Do you mean that the procedure for this experiment is:
1. Immerse photocatalyst in an aqueous solution with a trapping agent.
2. Let the photocatalyst adsorb the trapping agent.
3. Dry the photocatalyst.
4. Load the photocatalyst in the photocatalytic reactor.
5. Run the gas phase photocatalytic reaction as normal.
6. Observe the drop of performance to determine the reactive species trapped.
Is this correct? Is there an article that describes this procedure?
Thank you for the answers!
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