The emissions of NO and HONO from the KNO photolysis in the presence of TiO were measured using a round-shape reactor coupled to a NO analyzer. TiO played important roles in the emission flux density of NO (R) and HONO (R), depending on crystal structures and mass ratios of TiO. R and R significantly decreased with increasing the rutile and anatase mass ratios from 0 to 8 and 0.5 wt.%, respectively. Nevertheless, with further increasing the anatase mass ratio to 8 wt.%, there was an increase in R and R. R on KNO/TiO/SiO had positive correlation with the KNO mass (1-20 wt.%), irradiation intensity (80-400 W/m) and temperature (278-308 K), while it had the maximum value at the relative humidity (RH) of 55%. R on KNO/TiO/SiO slightly varied with the KNO mass and temperature, whereas it increased with the irradiation intensity and RH. In addition, the mechanism for NO and HONO emissions from the nitrates photolysis and atmospheric implications were discussed.
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