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Solution medium effects on the photochemical degradation of pyrene in water

Paper ID Volume ID Publish Year Pages File Format Full-Text
28369 44071 2007 7 PDF Available
Title
Solution medium effects on the photochemical degradation of pyrene in water
Abstract

Poly-aromatic hydrocarbons (PAHs), carcinogenic compounds ubiquitous in the environment, are readily degraded photochemically. Understanding the kinetics and mechanisms of their photochemical degradation is important in assessing their overall toxicity. Here we have measured the photo-oxidation rate of pyrene in aqueous solution as a function of environmentally relevant solution media. The degradation rate of pyrene is 0.268 min−1 in air-equilibrated water at pH 8. Degradation appears to require water and is dependant on oxygen concentrations, ionic strength and the concentration of humic acid in solution. Rates decrease as oxygen concentrations decrease, reaching a rate of 0.0424 min−1 in argon-purged solutions. Degradation increases as ionic strength increases and decreases as humic acid concentration increases. Rates will vary by as much as an order of magnitude over the range of environmental ionic strengths and humic acid concentrations. Mechanistic studies showed the formation of the 1-hydroxypyrene intermediate, consistent with a previously proposed mechanism in the literature that proceeds via electron transfer from excited singlet state pyrene to oxygen.

Keywords
Pyrene; Photodegradation; Water; Oxygen; Humic acid
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 186, Issues 2–3, 25 February 2007, Pages 342–348
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us