Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 162, Issue 2-3, Pages 716-723Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2008.05.086
Keywords
Photodegradation; PAH; Pyrene; Iron oxide; Solid phase
Categories
Funding
- China National Natural Science Foundation [20577007]
- Guangdong Natural Science Foundation Key [036533]
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To better understand the photodegradation of polycyclic aromatic hydrocarbons (PAH) in solid phase in natural environment, laboratory experiments were conducted to study the influencing factors, kinetics and intermediate compound of pyrene photodegradation by iron oxides. The results showed that the pyrene photodegradation rate followed the order of alpha-FeOOH > alpha-Fe2O3 > gamma-Fe2O3 > gamma-FeOOH at the same reaction conditions. Lower dosage of alpha-FeOOH and higher light intensity increased the photodegradation rate of pyrene. Iron oxides and oxalic acid can set up a photo-Fenton-like system without additional H2O2 in solid phase to enhance the photodegradation of pyrene under UV irradiation. All reaction followed the first-order reaction kinetics. The half-life (t(1/2)) of pyrene in the system showed the higher efficiencies of using iron oxide as photocatalyst to degrade pyrene. Intermediate compound pyreno was found during photodegradation reactions by gas chromatography-mass spectrometry (GC-MS). The photodegradation efficiency for PAHs in this photo-Fenton-like system was also confirmed by using the contaminated soil samples. This work provides some useful information to understand the remediation of PAHs contaminated soils by photochemical techniques under practical condition. (C) 2008 Elsevier B.V. All rights reserved.
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