Sorption Equilibrium of Aromatic Pollutants onto Dissolved Humic Acids

The adsorption of some benzene derivatives—o-xylene, toluene, phenol, and benzyl alcohol onto dissolved humic acids (HA) was analyzed by equilibrium dialyses experiments. HA were extracted from compost and from leonardite. The humification index (E 4 /E 6 ratio) and the distribution coefficient betw...

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Bibliographic Details
Published in:Water, air, and soil pollution air, and soil pollution, 2017-04, Vol.228 (4), p.1, Article 136
Main Authors: Leone, Vincenzo, Musmarra, Dino, Iovino, Pasquale, Capasso, Sante
Format: Article
Language:English
Subjects:
Acids
Ammonium
Atmospheric Protection/Air Quality Control/Air Pollution
Benzene
Binding sites
Climate Change/Climate Change Impacts
Composts
Earth and Environmental Science
Environment
Environmental monitoring
Equilibrium
Experiments
Humic acids
Humification
Hydrocarbons
Hydrogeology
Laboratories
Ligands
Molecular weight
Organic contaminants
Phenols
Pollutants
Polyethylene glycol
Soil Science & Conservation
Sorption
Spectrum analysis
Studies
Surface water
Toluene
Water Quality/Water Pollution
Xylene
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Summary:The adsorption of some benzene derivatives—o-xylene, toluene, phenol, and benzyl alcohol onto dissolved humic acids (HA) was analyzed by equilibrium dialyses experiments. HA were extracted from compost and from leonardite. The humification index (E 4 /E 6 ratio) and the distribution coefficient between ammonium sulfate/polyethylene glycol solutions show that HA from compost have a higher hydrophobicity. Assuming that the binding sites onto HA molecules are energetically equivalent, the binding curves were analyzed, and the amount of ligands bound per unit weight of HA and the association constants were derived. The binding capacity was higher for the HA from compost and for more hydrophobic ligands.
ISSN:0049-6979
1573-2932
DOI:10.1007/s11270-017-3321-9