Abstract:

The photocatalytic degradation of gaseous acetone in a SGY-1 photoreactor was investigated by using nanoscale titanium dioxide(marked as P25)as the photocatalyst and glass as the substrate.Th e experimental re-suits show that(1)the degradation rate of acetone gradually increases with the increasing of 1)25 dosage in the re-action system first,and then slightly decreases after the P25 dosage reaches a certain value,(2)the degradation
rate of acetone reaches the maximum value of 92.7% .after 1.5 h of the UV irradiation when P25 amounts to 460 mg on the surface of substrate,i.e.the surface density of P25 equals to 1 mg/cm² ,(3)there is hardly photolysis in the absence of the photocatalyst,(4)both the existence of water in the reaction system and the increase in UV light intensity can enhance the degradation rate of gaseous acetone,and(5)the degradation rate of acetone re-markably decreases due to the partial deactivation of the identical photocatalyst being used six times.

Key words: nanoscale titanium dioxide, photocatalysis, acetone, degradation