Fig. 7: Schematic illustration of the working mechanism of PA/WO3 photocatalysis for the selective PCD. | Nature Communications

Fig. 7: Schematic illustration of the working mechanism of PA/WO3 photocatalysis for the selective PCD.

From: Self-wetting triphase photocatalysis for effective and selective removal of hydrophilic volatile organic compounds in air

Fig. 7

a WO3 is coated with periodic acid (PA) to form PA/WO3. b In situ surface water layer is formed due to the hygroscopic property of PA in ambient air while the periodate ions (IO4−) in the in situ water layer serve as efficient electron acceptors. c Under visible light, the photogenerated electrons are rapidly scavenged by IO4− while holes produce •OH radicals which subsequently degrade hydrophilic VOCs dissolved into the in situ water layer. However, hydrophobic VOCs remain intact during photocatalysis due to the “water barrier effect”.

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