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Equilibrium adsorption of polycyclic aromatic hydrocarbons from water onto activated carbon



Equilibrium adsorption of polycyclic aromatic hydrocarbons from water onto activated carbon



Environmental Science & Technology 18(6): 395-403



Adsorption isotherm data for 11 polycyclic aromatic hydrocarbons (PAH) from water onto Filtrasorb 400 activated carbon at 25.degree. C was generated by batch shake testing. An evaluation of Henry's law, Langmuir, BET, Freundlich and Redlich-Peterson equations indicated that the Langmuir equation was most useful for representing the data. Fitting the data to 2 linearized forms of the Langmuir equation provided estimates of the capacity term q0 and the energy term b which apply over different equilibrium concentration (Ce) ranges. The products of the parameters bq0 obtained by using the low Ce linear form of the Langmuir equation approximated Henry's law adsorption constants. These values ranged from 2390 (mg/g)/(mg/l) for naphthalene to 326,000 (mg/g)/(mg/l) for chrysene. The parameter q0 obtained by using the high Ce linear form of the Langmuir equation reflected limiting adsorption capacity. These values ranged from 580 mg/g for naphthalene to 14.7 mg/g for benz[a]anthracene. Log (q0) and log (bq0) correlated with log (Cs) and log (Kow) [1-octanol/water partition coefficient], making it possible to predict relative adsorption of PAH from these latter properties. The adsorption of PAH onto activated carbon was stronger than adsorption of PAH onto soils, sediments and suspended organic matter and comparable to or greater than the adsorption of other hydrophobic organics onto activated carbon.

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Accession: 053021079

Download citation: RISBibTeXText

PMID: 22247939

DOI: 10.1021/es00124a002


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