Journal Article

PreJuSER-22330

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Surface-associated metal catalyst enhances the sorption of perfluorooctanoic acid to multi-walled carbon nanotubes

Li, C.FZJ* ; Schaeffer, A. ; Sequaris, J. M.FZJ* ; Laszlo, K. ; Toth, A. ; Tombacz, E. ; Vereecken, H.FZJ* ; Ji, R. ; Klumpp, E.FZJ*

2012
Elsevier Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.jcis.2012.03.038

Abstract: The 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.

Keyword(s): Adsorption (MeSH) ; Aluminum: chemistry (MeSH) ; Cobalt: chemistry (MeSH) ; Fluorocarbons: chemistry (MeSH) ; Hydrogen-Ion Concentration (MeSH) ; Magnesium: chemistry (MeSH) ; Manganese: chemistry (MeSH) ; Nanotubes, Carbon: chemistry (MeSH) ; Octanoic Acids: chemistry (MeSH) ; Osmolar Concentration (MeSH) ; Surface Properties (MeSH) ; Fluorocarbons ; Nanotubes, Carbon ; Octanoic Acids ; perfluorooctanoic acid ; Aluminum ; Magnesium ; Manganese ; Cobalt ; J ; Perfluorooctanoic acid (auto) ; Multi-walled carbon nanotubes (auto) ; Metal catalyst (auto) ; Sorption (auto)

Note: Chengliang 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).

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Contributing Institute(s):

1. Agrosphäre (IBG-3)

Research Program(s):

1. Terrestrische Umwelt (P24)

Appears in the scientific report 2012

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Database coverage:
; Current Contents - Social and Behavioral Sciences ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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