Facilitated transport of a PAH mixture by a rhamnolipid biosurfactant in porous silica matrices
| Autor: | Noordman, WH, Bruining, JW, Wietzes, P, Janssen, DB, Bruining, Jaap-Willem |
|---|---|
| Přispěvatelé: | Groningen Biomolecular Sciences and Biotechnology, Biotechnology |
| Jazyk: | angličtina |
| Rok vydání: | 2000 |
| Předmět: |
SURFACTANT ADSOLUBILIZATION
surfactant Fluorene ENHANCED REMOVAL SORPTION NEUTRAL HYDROLYSIS NONIONIC ORGANIC-COMPOUNDS POLYCYCLIC AROMATIC-HYDROCARBONS chemistry.chemical_compound porous media HUMIC-ACID Pulmonary surfactant Environmental Chemistry Organic chemistry Humic acid MICELLAR LIQUID-CHROMATOGRAPHY Water Science and Technology Naphthalene chemistry.chemical_classification Facilitated diffusion HPLC RETENTION Rhamnolipid biosurfactant Sorption Phenanthrene DISTRIBUTED REACTIVITY MODEL chemistry Chemical engineering adsorption contaminant transport |
| Zdroj: | Journal of Contaminant Hydrology, 44(2), 119-140 |
| ISSN: | 0169-7722 |
| DOI: | 10.1016/s0169-7722(00)00097-8 |
| Popis: | The facilitated transport of a mixture of three polycyclic aromatic hydrocarbons (PAH) (naphthalene. fluorene, and phenanthrene) by a rhamnolipid biosurfactant was determined with silica. octadecyl-coated silica, and humic acid-coated silica columns. The retardation factors for the contaminants in the absence of rhamnolipid ranged from 1.8 (naphthalene with silica) to 708 (phenanthrene with octadecyl-coated silica). The retardation factors for phenanthrene were up to eightfold lower in the presence of 500 mg/l rhamnolipid compared to the situation where no rhamnolipid was present. The facilitated transport of the contaminants in the presence of rhamnolipid could be predicted by accounting for sorption, solubilization and admicellar sorption. In the octadecyl-coated matrix, transport of fluorene and phenanthrene was enhanced even in the presence of sub-micellar solution of rhamnolipid (20 mg/l), showing that adsorbed surfactant reduced the affinity of these compounds to this stationary phase. Linear free-energy relations (LFERs) indicated that the matrix-water, micelle-water, and admicelle-water partitioning constants for PAH were correlated with their l-octanol-water partitioning constants. These correlations were used to simulate the facilitated transport of contaminants of varying hydrophobicity by a surfactant. It was concluded that surfactants have the greatest transport facilitating effect on the mole hydrophobic components. The effectiveness of surfactants for enhancing removal of the less hydrophobic compounds(log K-ow |
| Databáze: | OpenAIRE |
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