â–º Electrostatic repulsion suppresses the sorption of PFCs on CNTs. â–º Hydrophobic interaction is principally involved in the sorption of PFCs on CNTs. Highlights: â–º Sorption capacities of PFOA on different CNTs are less than that on activated carbon and resins. 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. Hydrogen bonding interaction was negligible. Electrostatic repulsion suppressed the sorption of PFCs on the CNTs, resulting in the lower sorption with increasing pH. 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. 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. International Nuclear Information System (INIS)ĭeng Shubo Zhang Qiaoying Nie Yao Wei Haoran Wang Bin Huang Jun Yu Gang Xing Baoshan mechanisms of perfluorinated compounds on carbon nanotubes
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