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Solubilization of pyrene by anionic-nonionic mixed surfactants
1Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310028, PR China.
Journal of Hazardous Materials
|June 5, 2004
Summary
Surfactant-enhanced remediation effectively removes soil contaminants. Mixed surfactants, like SDS with TX405, show enhanced pyrene solubilization beyond ideal predictions, improving soil cleanup strategies.
Area of Science:
- Environmental Chemistry
- Soil Science
- Colloid and Surface Chemistry
Background:
- Surfactant-enhanced remediation (SER) is a key technology for removing hydrophobic organic compounds from contaminated soils.
- Understanding surfactant behavior in mixed systems is crucial for optimizing remediation efficiency.
Purpose of the Study:
- To investigate the solubilization of pyrene using mixed anionic-nonionic surfactants.
- To determine the effects of surfactant mixing on molar solubilization ratio (MSR), micelle-water partition coefficient (Kmc), and critical micelle concentration (CMC).
Main Methods:
- Experimental measurements of MSR, Kmc, and CMC for pyrene in various SDS and nonionic surfactant mixtures.
- Comparison of experimental data with ideal mixing rules.
Main Results:
- Pyrene solubilization (MSR) in mixed surfactants exceeded ideal mixing predictions.
- The order of enhanced MSR was SDS-TX405 > SDS-Brij35 > SDS-Brij58 > SDS-TX100, correlating with the nonionic surfactant's HLB.
- Deviations in Kmc and negative deviations in CMC from ideal values influenced the mixing effects on MSR.
Conclusions:
- Anionic-nonionic surfactant mixtures can significantly enhance pyrene solubilization in SER.
- The synergistic effects are linked to non-ideal micelle formation and partitioning behavior.
- Optimizing surfactant mixtures based on HLB and mixing properties can improve soil remediation outcomes.