Fig. 3: Formation and effects of the in situ formed water layer. | Nature Communications

Fig. 3: Formation and effects of the in situ formed water layer.

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

Fig. 3

a Catalyst weight increase of PA/WO3, NaIO4/WO3, and bare WO3 samples after exposing each catalyst under humid air (RH 65%) for 30 min. RH is defined as relative humidity. b FT-IR spectra of bare WO3 (I) before and (II) after exposure to humid air, and those of PA/WO3 (III) before and (IV) after exposure to humid air for 30 min. c PCD activity of PA/WO3 for acetaldehyde (AA) degradation after exposure to dry and humid air for 30 min. In situ DRIFT spectra for d PA/WO3 after exposing the sample to 300 ppmv AA/dry air stream and e PA/WO3 in 300 ppmv AA/RH 65% air stream for (I) 10 s, (II) 1 min, (III) 3 min, and (IV) 5 min. The spectra of the dry PA/WO3 surface were collected and used as the background. f PCD activity of bare WO3, NaIO4/WO3, and their slurries containing 26 wt% water for the degradation of AA. The dashed lines with open symbols represent the CO2 concentration generated from AA degradation. Error bars are defined as standard deviation. Experimental conditions: [AA]0 = 120 ppmv; visible light (λ > 420 nm) intensity of 2.2 mW/cm2; sample amount of 50 mg (with 13 mg of extra water in the case of WO3 slurry and NaIO4/WO3 slurry); reaction temperature of 30 °C.

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