Adsorption of phenanthrene and pyrene by biochar produced from the excess sludge: experimental studies and theoretical analysis

Adsorption of phenanthrene and pyrene by biochar produced from the excess sludge: experimental... A biochar derived from the pyrolysis of excess sludge of sewage treatment plant at 700 °C was used to remove phenanthrene and pyrene from aqueous solution. The adsorption equilibrium for phenanthrene and pyrene was achieved within 7.5 and 15 h, respectively. The adsorption kinetics of phenanthrene and pyrene were well fitted to pseudo-second-order model, and the isotherms were well fitted to Freundlich adsorption isotherm model (R 2 > 0.96). The effect of variation of pH on the adsorption of the biochar was observed to be insignificant. The hydrophobic action and pore filling might be the main mechanisms of the adsorption of phenanthrene and pyrene on the biochar. The density functional theory calculations confirmed that the adsorption depended mainly on the biochar structure and the molecular volumes of phenanthrene and pyrene. Phenanthrene molecule is smaller than the pyrene molecule and therefore showed better adsorption characteristics with the biochar than the pyrene molecule. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Environmental Science and Technology Springer Journals

Adsorption of phenanthrene and pyrene by biochar produced from the excess sludge: experimental studies and theoretical analysis

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2017 by Islamic Azad University (IAU)
Subject
Environment; Environment, general; Environmental Science and Engineering; Environmental Chemistry; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution; Soil Science & Conservation; Ecotoxicology
ISSN
1735-1472
eISSN
1735-2630
D.O.I.
10.1007/s13762-017-1272-8
Publisher site
See Article on Publisher Site

Abstract

A biochar derived from the pyrolysis of excess sludge of sewage treatment plant at 700 °C was used to remove phenanthrene and pyrene from aqueous solution. The adsorption equilibrium for phenanthrene and pyrene was achieved within 7.5 and 15 h, respectively. The adsorption kinetics of phenanthrene and pyrene were well fitted to pseudo-second-order model, and the isotherms were well fitted to Freundlich adsorption isotherm model (R 2 > 0.96). The effect of variation of pH on the adsorption of the biochar was observed to be insignificant. The hydrophobic action and pore filling might be the main mechanisms of the adsorption of phenanthrene and pyrene on the biochar. The density functional theory calculations confirmed that the adsorption depended mainly on the biochar structure and the molecular volumes of phenanthrene and pyrene. Phenanthrene molecule is smaller than the pyrene molecule and therefore showed better adsorption characteristics with the biochar than the pyrene molecule.

Journal

International Journal of Environmental Science and TechnologySpringer Journals

Published: Feb 20, 2017

References

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