Desorption kinetics of Benzene in a sandy soil in the presence of powdered activated carbon

J. W. Choi, S. B. Kim, Dong Ju Kim

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Desorption kinetics of benzene was investigated with a modified biphasic desorption model in a sandy soil with five different powdered activated carbon (PAC) contents (0, 1, 2, 5, 10% w/w) as sorbents. Sorption experiments followed by series dilution desorption were conducted for each sorbent. Desorption of benzene was successively performed at two stages using deionized water and hexane. Modeling was performed on both desorption isotherm and desorption rate for water-induced desorption to elucidate the presence of sorption-desorption hysteresis and biphasic desorption and if present to quantify the desorption-resistant fraction (q irr) and labile fraction (F) of desorption site responsible for rapid process. Desorption isotherms revealed that sorption-desorption exhibited a severe hysteresis with a significant fraction of benzene being irreversibly adsorbed onto both pure sand and PAC, and that desorption-resistant fraction (q irr) increased with PAC content. Desorption kinetic modeling showed that desorption of benzene was biphasic with much higher (4-40 times) rate constant for rapid process (k 1) than that for slow process (k 2), and that the difference in the rate constant increased with PAC content. The labile fraction (F) of desorption site showed a decreasing tendency with PAC. The experimental results would provide valuable information on remediation methods for soils and groundwater contaminated with BTEX.

Original languageEnglish
Pages (from-to)313-323
Number of pages11
JournalEnvironmental Monitoring and Assessment
Volume125
Issue number1-3
DOIs
Publication statusPublished - 2007 Feb 1

Fingerprint

Benzene
Activated carbon
sandy soil
benzene
activated carbon
Desorption
desorption
Soil
Carbon
Soils
kinetics
Kinetics
Water
Groundwater
Hexanes
Sorption
sorption
Sorbents
hysteresis
Isotherms

Keywords

  • Benzene
  • Desorption kinetics
  • Desorption-resistant
  • Powdered activated carbon
  • Sorption-desorption

ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Desorption kinetics of Benzene in a sandy soil in the presence of powdered activated carbon. / Choi, J. W.; Kim, S. B.; Kim, Dong Ju.

In: Environmental Monitoring and Assessment, Vol. 125, No. 1-3, 01.02.2007, p. 313-323.

Research output: Contribution to journalArticle

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