Partitioning of polycyclic aromatic hydrocarbons to solid-sorbed nonionic surfactants.
The partition of hydrophobic organic compounds (HOCs) into solid-sorbed surfactant has a crucial role in describing and predicting the distribution of HOCs in solid-water-surfactant systems. The experimental results of this study indicated that the partition coefficients of polycyclic aromatic hydrocarbons (PAHs) into the solid-sorbed surfactant (Ksm) increased with an increase in the sorption amount of surfactants onto solid and reached a stable maximum value (Km sm) at the sorption of surfactants in saturation state, at which the solid surface was completely covered with the surface micelle (or admicelle). The fitted Km sm values for PAHs with different surfactants were found to have a good linear relationship with the corresponding partition coefficient of PAHs to surfactant micelles in solution (Kmc), and then a model was developed to describe and predict the distribution of PAHs in solid-water-surfactant systems. These results are of practical interest for developing effective and safe surfactant-enhanced remediation technologies.
Zhu
Lizhong
L
Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310028, China. zlz@zju.edu.cn
Zhou
Wenjun
W
D000327:Adsorption; D004785:Environmental Pollutants; D052918:Environmental Restoration and Remediation / Q000379:methods*; D057927:Hydrophobic and Hydrophilic Interactions; D008823:Micelles; D008962:Models, Theoretical; D011084:Polycyclic Aromatic Hydrocarbons; D011136:Polysorbates; D012989:Soil Pollutants; D013500:Surface Tension; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical
D004785:Environmental Pollutants; D008823:Micelles; D011084:Polycyclic Aromatic Hydrocarbons; D011136:Polysorbates; D012989:Soil Pollutants; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical