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000022330 084__ $$2WoS$$aChemistry, Physical
000022330 1001_ $$0P:(DE-Juel1)VDB63965$$aLi, C.$$b0$$uFZJ
000022330 245__ $$aSurface-associated metal catalyst enhances the sorption of perfluorooctanoic acid to multi-walled carbon nanotubes
000022330 260__ $$aAmsterdam [u.a.]$$bElsevier$$c2012
000022330 300__ $$a342 - 346
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000022330 440_0 $$03193$$aJournal of Colloid and Interface Science$$v377$$x0021-9797
000022330 500__ $$3POF3_Assignment on 2016-02-29
000022330 500__ $$aChengliang Li is grateful for a scholarship from the Deutscher Akademischer Austausch Dienst (DAAD). This study was financed by the National Natural Science Foundation of China (Project Nos.: 20977043 and 20777033).
000022330 520__ $$aThe perfluorooctanoic acid (PFOA) sorption behavior of two commercial multi-walled carbon nanotubes (MWCNTs) (C 150 P from Bayer MaterialScience: BA and C-MWNTs from NanoTechLabs Inc.: CP) was investigated from aqueous solution. The BA nanotubes contained Co/Mn/Mg/Al catalysts both on their outer surface and in the inner bore while CP contained Fe-based catalyst typically within the tubes. The adsorption isotherms of (14)C-radiolabeled PFOA were measured by batch experiments and fitted to the Freundlich model (r(2)>0.92). The adsorption affinity and capacity on BA were significantly higher than on CP. Increasing the pH reduced the adsorption of PFOA due to the electrostatic interaction between the pH-sensitive surface and the adsorbate. Increasing the NaCl concentration led to the aggregation of the MWCNTs reducing the available surface and thus the adsorption capacity. Removal of the catalyst from the outer surface of BA changed the electrophoretic mobility from a positive to a negative value and also decreased the adsorbed amount of PFOA. The surface charge of the surface-associated metal catalyst favors the electrostatic sorption of PFOA. Such surface modifications may be a promising way to improve the sorption capacity of MWCNTs for pollutants such as PFOA and to broaden their potential application in water purification.
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000022330 65320 $$2Author$$aPerfluorooctanoic acid
000022330 65320 $$2Author$$aMulti-walled carbon nanotubes
000022330 65320 $$2Author$$aMetal catalyst
000022330 65320 $$2Author$$aSorption
000022330 650_2 $$2MeSH$$aAdsorption
000022330 650_2 $$2MeSH$$aAluminum: chemistry
000022330 650_2 $$2MeSH$$aCobalt: chemistry
000022330 650_2 $$2MeSH$$aFluorocarbons: chemistry
000022330 650_2 $$2MeSH$$aHydrogen-Ion Concentration
000022330 650_2 $$2MeSH$$aMagnesium: chemistry
000022330 650_2 $$2MeSH$$aManganese: chemistry
000022330 650_2 $$2MeSH$$aNanotubes, Carbon: chemistry
000022330 650_2 $$2MeSH$$aOctanoic Acids: chemistry
000022330 650_2 $$2MeSH$$aOsmolar Concentration
000022330 650_2 $$2MeSH$$aSurface Properties
000022330 650_7 $$00$$2NLM Chemicals$$aFluorocarbons
000022330 650_7 $$00$$2NLM Chemicals$$aNanotubes, Carbon
000022330 650_7 $$00$$2NLM Chemicals$$aOctanoic Acids
000022330 650_7 $$0335-67-1$$2NLM Chemicals$$aperfluorooctanoic acid
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