Photocatalytic degradation of PAHs in cigarette smoke catalyzed by TiO_2

Gas sampling installations assembled by ourselves were used to study photocatalytic degradation of polycyclic aromatic hydrocarbons(PAHs) in cigarette smoke.PAHs in the samples were analyzed by gas chromatography with mass selective detection.Results show that the photocatalytic degradation effect of low-ring PAHs was determined by quantity of TiO2,while the photocatalytic degradation effect of high-ring PAHs was determined by intensity of UV-C light.Under weak UV-C light,photocatalytic degradation efficiency of low-ring PAHs increased by 38.7% with the amount of TiO2 increased from 3 grams to 6 grams.Under the amount of 3 grams of TiO2,the photocatalytic degradation efficiency of high-ring PAHs increased by 87.2% when UV-C light intensity was enhanced.However,under strong UV-C irradiation,the catalytic degradation efficiency of low-ring PAHs decreased by 76.9%(under 3 grams of TiO2) and 72.4%(under 6 grams of TiO2).Under the amount of 3 grams of TiO2 with strong UV-C irradiation,the catalytic degradation efficiency of B[a]P increased by 83.5%.