The Photodegradation of Phenanthrene on Soil Surface Under UV Light

Polycyclic aromatic hydrocarbons (PAHs) are a group of major contaminants that are ubiquitous in the environment due to their toxicity, mutagenicity and carcinogenicity. This paper studied the soil borne PAHs photodegradation under UV irradiation with phenanthrene(Phe) as target contaminants. The effects of temperature,humic acids(HA)and the intensity of UV irradiation on the Phe photodegradation were investigated. The dynamics of photodegradation of Phe were studied under different conditions. The results show that the rate of Phe photodegradation increases when the temperature rises from 20 ℃ to 30 ℃. The HA played a sensitivizing role during the Phe photodegradation. When the HA concentration was 5 mg·kg-1, HA could efficiently sensitivize the Phe photodegradation. The rate of photodegradation decreases with the decreasing UV irradiation intensity, correlated positively. The half-life increases with the decreasing UV irradiation intensity, correlated negatively.