Removal of polycyclic aromatic hydrocarbons from organic solvents by ashes wastes

Polycyclic aromatic hydrocarbons (PAHs) can be formed during the refinery processes of crude petroleum. Their removal is of great importance. The same happens with other organic solvents used for the extraction of PAHs (hexane, acetonitrile…), which can be polluted with PAHs. Kinetic and equilibrium...

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Bibliographic Details
Published in:Journal of hazardous materials 2010-06, Vol.178 (1), p.273-281
Main Authors: Pérez-Gregorio, M.R., García-Falcón, M.S., Martínez-Carballo, E., Simal-Gándara, J.
Format: Article
Language:English
Subjects:
Acetonitrile
Acetonitriles - chemistry
Adsorbents
Adsorption
Animals
Applied sciences
Ash removal
Ashes
Bivalvia - chemistry
Exact sciences and technology
General treatment and storage processes
Hexanes - chemistry
Industrial Waste - analysis
Kinetics
Molecular Weight
n-hexane
Particle Size
Pollution
Polyallylamine hydrochloride
Polycyclic aromatic hydrocarbons
Polycyclic Aromatic Hydrocarbons - chemistry
Polycyclic Aromatic Hydrocarbons - isolation & purification
Removal efficacy
Solvents
Solvents - chemistry
Sorption
Temperature
Thermodynamics
Wastes
Wood
Wood ashes wastes
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Summary:Polycyclic aromatic hydrocarbons (PAHs) can be formed during the refinery processes of crude petroleum. Their removal is of great importance. The same happens with other organic solvents used for the extraction of PAHs (hexane, acetonitrile…), which can be polluted with PAHs. Kinetic and equilibrium batch sorption tests were used to investigate the effect of wood ashes wastes as compared to activated carbon on the sorption of three representative PAHs from n-hexane and acetonitrile. Mussel shell ashes were discarded for batch sorption experiments because they were the only ashes containing PAHs. The equilibrium time was reached at 16 h. Physical sorption caused by the aromatic nature of the compounds was the main mechanism that governed the PAHs removal process. Our investigation revealed that wood ashes obtained at lower temperature (300 °C) did not show any PAHs sorption, while ashes obtained at higher temperature (>500 °C) have adsorbent sites readily available for the PAH molecules. An increase in the molecular weight of PAHs has a strong effect on sorption wood ashes wastes. As low the wood ashes particle size as high the sorption of PAHs, as a result of differences in adsorbent sites. The performance of wood ash wastes vs. activated carbon to remove 10 PAHs from organic solvents is competitive in price, and a good way for waste disposal.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2010.01.073