Journal
ENVIRONMENTAL POLLUTION
Volume 168, Issue -, Pages 138-144Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2012.03.048
Keywords
Carbon nanotube; Perfluorooctanoate; Hydrophobic interaction; Electrostatic interaction; Sorption mechanism
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Funding
- National Nature Science Foundation of China [21177070, 50838002]
- State Key Joint Laboratory of Environment Simulation and Pollution [10Y01ESPCT]
- Tsinghua University Initiative Scientific Research Program [Z02-2-20101081813]
- Laboratory Fund of Tsinghua University
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Sorption of perfluorinated compounds (PFCs) on carbon nanotubes (CNTs) is critical for understanding their subsequent transport and fate in aqueous environments, but the sorption mechanisms remain largely unknown. In this study, the sorption of six PFCs on CNTs increased with increasing C-F chain length when they had a same functional group, and the CNTs with hydroxyl and carboxyl groups had much lower adsorbed amount than the pristine CNTs, indicating that hydrophobic interaction dominated the sorption of PFCs on the CNTs. Electrostatic repulsion suppressed the sorption of PFCs on the CNTs, resulting in the lower sorption with increasing pH. Hydrogen bonding interaction was negligible. The hydrophobic C-F chains can be closely adsorbed on the CNTs surface in parallel to the axis or along the curvature, making it impossible to form micelles on the CNT surface, leading to the lower sorption than other adsorbents. (c) 2012 Elsevier Ltd. All rights reserved.
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