Adsorption and photodegradation of pyrene on magnetic, carbonaceous, and mineral subfractions of coal stack ash
Two coal stack ashes have been separated into three principal subfractions (carbonaceous, mineral, and magnetic). Photoreactivities and adsorptivities of pyrene on the three subfractions have been determined, the latter by gas-solid chromatography. For each ash, the carbonaceous subfraction is the strongest adsorbent and has the greatest ability to stabilize adsorbed pyrene toward photodegradation, while the mineral subfraction is a much weaker adsorbent and pyrene adsorbed on it shows relatively high photoreactivity. The magnetic subfraction is the weakest adsorbent, but any pyrene adsorbed on its surface is relatively resistant to photodegradation. The presence of even a small quantity of carbon in coal ash leads to stabilization of adsorbed pyrene toward photodegradation, by comparison with silica, alumina, or glass surfaces. The relative quantity of carbon in coal ash appears to be the main factor determining the extent of photochemical reactivity of pyrene adsorbed on the surface. In coal ashes that contain a relatively large quantity of iron, the magnetic particles may play a minor role in stabilizing adsorbed pyrene toward photodegradation.
- Research Organization:
- Univ. of Tennessee, Knoxville (USA)
- DOE Contract Number:
- AS05-81ER60006; FG05-87ER60552
- OSTI ID:
- 6132375
- Journal Information:
- Environ. Sci. Technol.; (United States), Journal Name: Environ. Sci. Technol.; (United States) Vol. 23:3; ISSN ESTHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010800* -- Coal
Lignite
& Peat-- Waste Management
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADSORPTION
AEROSOL WASTES
AIR POLLUTION
AROMATICS
ASHES
CARBONACEOUS MATERIALS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHROMATOGRAPHY
COAL
CONDENSED AROMATICS
ENERGY SOURCES
FLY ASH
FOSSIL FUELS
FRACTIONATION
FUELS
GAS CHROMATOGRAPHY
HYDROCARBONS
MANAGEMENT
MATERIALS
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
POLLUTION
PYRENE
RESIDUES
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
STACK DISPOSAL
SURFACE PROPERTIES
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES