Sub-CMC solubilization of dodecane by rhamnolipid in saturated porous media

Hua Zhong, Hui Zhang, Zhifeng Liu, Xin Yang, Mark L Brusseau, Guangming Zeng

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Experiments were conducted with a two-dimensional flow cell to examine the effect of monorhamnolipid surfactant at sub-CMC concentrations on solubilization of dodecane in porous media under dynamic flow conditions. Quartz sand was used as the porous medium and artificial groundwater was used as the background solution. The effectiveness of the monorhamnolipid was compared to that of SDBS, Triton X-100, and ethanol. The results demonstrated the enhancement of dodecane solubility by monorhamnolipid surfactant at concentrations lower than CMC. The concentrations (50-210 μM) are sufficiently low that they do not cause mobilization of the dodecane. Retention of rhamnolipid in the porous medium and detection of nano-size aggregates in the effluent show that the solubilization is based on a sub-CMC aggregate-formation mechanism, which is significantly stronger than the solubilization caused by the co-solvent effect. The rhamnolipid biosurfactant is more efficient for the solubilization compared to the synthetic surfactants. These results indicate a strategy of employing low concentrations of rhamnolipid for surfactant-enhanced aquifer remediation (SEAR), which may overcome the drawbacks of using surfactants at hyper-CMC concentrations.

Original languageEnglish (US)
Article number33266
JournalScientific Reports
Volume6
DOIs
StatePublished - 2016

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Surface-Active Agents
Groundwater
Quartz
Octoxynol
Solubility
Ethanol
n-dodecane
rhamnolipid

ASJC Scopus subject areas

  • General

Cite this

Sub-CMC solubilization of dodecane by rhamnolipid in saturated porous media. / Zhong, Hua; Zhang, Hui; Liu, Zhifeng; Yang, Xin; Brusseau, Mark L; Zeng, Guangming.

In: Scientific Reports, Vol. 6, 33266, 2016.

Research output: Contribution to journalArticle

Zhong, Hua ; Zhang, Hui ; Liu, Zhifeng ; Yang, Xin ; Brusseau, Mark L ; Zeng, Guangming. / Sub-CMC solubilization of dodecane by rhamnolipid in saturated porous media. In: Scientific Reports. 2016 ; Vol. 6.
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AU - Zhang, Hui

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AU - Yang, Xin

AU - Brusseau, Mark L

AU - Zeng, Guangming

PY - 2016

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