Regenerable magnetic carbonized Calotropis gigantea fiber for hydrophobic-driven fast removal of perfluoroalkyl pollutants
Using Calotropis gigantea fiber (CGF) as the bio-template, the magnetic carbonized fiber (MC-CGF) was successfully prepared by anchoring Fe 3 O 4 onto CGF surface via pyrolysis, and well characterized by means of instrumental analysis. Subsequently, MC-CGF was used as the adsorbent to remove perfluo...
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Veröffentlicht in: | Cellulose (London) 2020-07, Vol.27 (10), p.5893-5905 |
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Hauptverfasser: | , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Using
Calotropis gigantea
fiber (CGF) as the bio-template, the magnetic carbonized fiber (MC-CGF) was successfully prepared by anchoring Fe
3
O
4
onto CGF surface via pyrolysis, and well characterized by means of instrumental analysis. Subsequently, MC-CGF was used as the adsorbent to remove perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) from water. The adsorption equilibrium of PFOA and PFOS on MC-CGF could be achieved within 1 h and 2 h, with maximum adsorption capacity of ~ 200 mg/g for them at pH 3.0. Coexisting ions (Na
+
, Mg
2+
, Fe
3+
) promoted the adsorption efficiency of MC-CGF to PFOA/PFOS, in particular for multivalent metal cations. During the adsorption process, hydrophobic interaction was principally involved, and was considered to be the driving force for fast removal of perfluoroalkyl pollutants. Such a hydrophobic-driven interaction was further evidenced using other perfluoroalkyl pollutants with different C–F chain length and functional groups as the models. Finally, MC-CGF was easily regenerated and recycled many times, demonstrating its potential for removing perfluoroalkyl pollutants from water in the future.
Graphic abstract |
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ISSN: | 0969-0239 1572-882X |
DOI: | 10.1007/s10570-020-03192-9 |