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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received March 23, 2012
Accepted June 23, 2012

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Sorption and desorption kinetics of PAHs in coastal sediment

Sanghwa Oh Qiliang Wang¹ Won Sik Shin^† Dong-Ik Song¹

Department of Environmental Engineering, Kyungpook National University, Daegu 702-701, Korea ¹Department of Chemical Engineering, Kyungpook National University, Daegu 702-701, Korea

wshin@mail.knu.ac.kr

Korean Journal of Chemical Engineering, January 2013, 30(1), 145-153(9), 10.1007/s11814-012-0101-5

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Abstract

Sorption and desorption kinetics of PAHs (naphthalene, phenanthrene and pyrene) in coastal sediment were investigated. Several kinetic models were used to analyze the kinetics: one-site mass transfer model (OSMTM), pseudo-first-order kinetic model (PFOKM), pseudo-second-order kinetic model (PSOKM), two compartment firstorder kinetic model (TCFOKM) and modified two compartment first-order kinetic model (MTCFOKM). Among the models, the MTCFOKM was the best in fitting both sorption and desorption kinetic data, and therefore could predict the most accurately. In MTCFOKM, the fast sorption fraction (f '1, s) increased with the hydrophobicity (Kow) of the PAHs, whereas the fast desorption fraction (f '1, d) decreased. The fast sorption rate constant (k'1, s) was much greater than the slow sorption rate constant (k'2, s). Effect of aging on the desorption kinetics was also analyzed. The f '1, d in MTCFOKM decreased but the slow desorption fraction (f '2, d) increased with aging, indicating that slow desorption is directly related_x000D_ to aging.

Keywords

Sorption Desorption Model Kinetics Sediment

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