Adsorption of a multicomponent rhamnolipid surfactant to soil

Wouter H. Noordman, Mark L Brusseau, Dick B. Janssen

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

The adsorption of rhamnolipid, a multicomponent biosurfactant with potential application in soil remediation, to two sandy soils was investigated using batch and column studies. The surfactant mixture contained six anionic components differing in lipid chain length and number of rhamnose moieties. Batch adsorption experiments indicated that the overall adsorption isotherms of total surfactant and of the individual components leveled off above a concentration at which micelles were formed. Column experiments showed that the retardation factors for the total surfactant and for the individual components decreased with increasing influent concentration. Extended tailing was observed in the distal portion of the surfactant breakthrough curve. The concentration-dependent retardation factors and the extended tailing are in accordance with the nonlinear (concave) adsorption isotherms found in the batch adsorption studies. The more hydrophobic rhamnolipid components were preferentially adsorbed, but adsorption was not correlated with the organic carbon content of the soil. This suggests that adsorption of rhamnolipid to soil is not a partitioning process but mainly an interfacial adsorption process.

Original languageEnglish (US)
Pages (from-to)832-838
Number of pages7
JournalEnvironmental Science and Technology
Volume34
Issue number5
DOIs
StatePublished - 2000

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Surface-Active Agents
surfactant
Surface active agents
adsorption
Soils
Adsorption
soil
Tailings
Adsorption isotherms
tailings
Rhamnose
isotherm
Micelles
Organic carbon
Remediation
Chain length
soil remediation
Lipids
rhamnolipid
breakthrough curve

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Adsorption of a multicomponent rhamnolipid surfactant to soil. / Noordman, Wouter H.; Brusseau, Mark L; Janssen, Dick B.

In: Environmental Science and Technology, Vol. 34, No. 5, 2000, p. 832-838.

Research output: Contribution to journalArticle

Noordman, Wouter H. ; Brusseau, Mark L ; Janssen, Dick B. / Adsorption of a multicomponent rhamnolipid surfactant to soil. In: Environmental Science and Technology. 2000 ; Vol. 34, No. 5. pp. 832-838.
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