Batch and column study: Sorption of perfluorinated surfactants from water and cosolvent systems by Amberlite XAD resins
| Autor: | Brian Ray Phillips, Michio Nakayama, Kerry Jade Davidsavor, Sangyoo Park, Feng Xiao |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Fluorocarbons
Sorbent Chromatography Inorganic chemistry Water Fraction (chemistry) Sorption Amberlite Sorption coefficient Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials Resins Synthetic Surface-Active Agents chemistry.chemical_compound Chain length Colloid and Surface Chemistry chemistry Solvents Polystyrenes Thermodynamics Statistical analysis Adsorption Methanol |
| Zdroj: | Journal of Colloid and Interface Science. 368:505-511 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2011.11.011 |
| Popis: | Amberlite XAD resins have been employed to a great extent as the sorbent for removing or concentrating organic compounds from different matrices. We present for the first time a systematic study on the sorption of perfluorochemical (PFC) surfactants, an emerging class of environmental contaminants, by XAD-7HP (moderately polar) and XAD-2 (nonpolar). The results show that XAD-7HP can strongly sorb PFCs at circumneutral pH; the isotherm-determined linear sorption coefficient can reach 106 L/kg. On the other hand, the sorption coefficient for XAD-2 was two orders of magnitude lower than that for XAD-7HP. PFC sorption on XAD-7HP increased with an increase of the perfluorocarbon chain length of PFC and a decrease of the solution pH, indicating the importance of hydrophobic and electrostatic effects. The sorption coefficient for XAD-7HP reduced markedly with increasing fraction of the organic cosolvent (methanol) in the water–cosolvent mixture; however, the trend could not be predicted by a log-linear cosolvency model. Furthermore, the statistical analysis of column test results showed that after regeneration XAD-7HP can be used at least eight times without significant loss of performance. Finally, the experimental results imply that XAD-7HP sorption of shorter-chained PFCs (⩽5 perfluorinated carbons) from water can be thermodynamically favorable. |
| Databáze: | OpenAIRE |
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