Heterogeneous polycyclic aromatic hydrocarbon degradation with ozone on silica gel carrier

Journal Article · Mon Jan 01 04:00:00 EST 1990 · Environmental Science and Technology; (United States)

DOI:https://doi.org/10.1021/es00071a005· OSTI ID:5469524

Alebic-Juretic, A ^[1]; Cvitas, T; Klasinc, L ^[2]

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1. Institute of Public Health, Rijeka (Yugoslavia)
2. Ruder Boskovic Institute, Zagreb (Yugoslavia)

Heterogeneous degradation of five polycyclic aromatic hydrocarbons (PAHs), perylene (Pe), pyrene (Py), benzo(a)pyrene (BaP), benz(a)anthracene (BaA), and fluoranthene (Flo), adsorbed on nonactivated (moisture-containing) silica gel with ozone in a fluidized-bed reactor has been studied. The concentrations of ozone employed varied from 0.050 to 0.400 ppm. The results obtained show that, concerning their kinetics, there is a clear difference between reactions with less than and more than monolayer coverage of the particle surface with PAHs, those carrying a submonomolecular layer being faster and indicating the effect of the particle surface. In more highly covered samples, the observed degradation obeys two distinct first-order laws, the slow one changing into the faster at monomolecular coverage; the relative reactivities are as follows: Pe > BaP > BaA > Py >> Flo, and BaP > Pe > BaA > Py >> Flo, respectively. According to the present results, heterogeneous degradation of PAHs by ozone on particle surfaces is one of important pathways for their removal from the atmosphere.

• OSTI ID: 5469524
• Journal Information: Environmental Science and Technology; (United States), Journal Name: Environmental Science and Technology; (United States) Vol. 24:1; ISSN ESTHA; ISSN 0013-936X
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ADSORBENTS
ANTHRACENE
AROMATICS
BENZOPYRENE
CHEMICAL REACTIONS
CONDENSED AROMATICS
DECOMPOSITION
FLUIDIZED BED REACTORS
FUEL DISPERSION REACTORS
HOMOGENEOUS REACTORS
HYDROCARBONS
ORGANIC COMPOUNDS
OZONE
PERYLENE
POLYCYCLIC AROMATIC HYDROCARBONS
PYRENE
REACTORS
SILICA GEL