Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 25, Issue 3, Pages 569-575Publisher
SCIENCE PRESS
DOI: 10.1016/S1001-0742(12)60083-7
Keywords
photolysis; soil surfaces; polycyclic aromatic hydrocarbons; UV irradiation
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Funding
- National Science Foundation for Young Scholars of China [41101474]
- Open Foundation of Key Laboratory of Industrial Ecology and Environmental Engineering [KLIEEE-09-04]
- Liaoning Doctoral Funds [20111076]
- Liaoning University Environment Institute Key Discipline Project [2012J-001]
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Photolysis of some polycyclic aromatic hydrocarbons (PAHs) on soil surfaces may play an important role in the fate of PAHs in the environment. Photolysis of PAHs on soil surfaces under UV irradiation was investigated. The effects of oxygen, irradiation intensity and soil moisture on the degradation of the three PAHs were observed. The results showed that oxygen, soil moisture and irradiation intensity enhanced the photolysis of the three PAHs on soil surfaces. The degradation of the three PAHs on soil surfaces is related to their absorption spectra and the oxidation-half-wave potential. The photolysis of PAHs on soil surfaces in the presence of oxygen followed pseudo first-order kinetics. The photolysis half-lives ranged from 37.87 days for benzo[a]pyrene to 58.73 days for phenanthrene. The results indicate that photolysis is a successful way to remediate PAHs-contaminated soils.
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