Batch and column study: Sorption of perfluorinated surfactants from water and cosolvent systems by Amberlite XAD resins
[Display omitted] ► Sorption of five long-chain PFCs by XAD-7HP and XAD-2 was investigated. ► XAD-7HP performance was compared with other resins reported in previous studies. ► XAD-7 HP is an excellent sorbent for concentrating or removing PFCs. Amberlite XAD resins have been employed to a great ext...
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Veröffentlicht in: | Journal of colloid and interface science 2012-02, Vol.368 (1), p.505-511 |
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Sprache: | eng |
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► Sorption of five long-chain PFCs by XAD-7HP and XAD-2 was investigated. ► XAD-7HP performance was compared with other resins reported in previous studies. ► XAD-7 HP is an excellent sorbent for concentrating or removing PFCs.
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 106L/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. |
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ISSN: | 0021-9797 1095-7103 |
DOI: | 10.1016/j.jcis.2011.11.011 |