Photocatalytic oxidation of octamethylcyclotetrasiloxane (D4): Towards a better understanding of the impact of volatile methyl siloxanes on photocatalytic systems

- Photocatalytic oxidation (PCO) of D4 at ppbv level in synthetic air under 40% of relative humidity.
- Photocatalytic activity decreases in presence of D4.
- Three intermediate products identified using TD-GC-MS and APCI.
- XPS analysis of TiO2 surface showed a deposit of organic intermediates and SiO2 due to D4 oxidation.
- In PCO of (D4 + toluene) mixture, D4 was oxidized on TiO2 leading to a decrease in toluene conversion.