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@ARTICLE{Li:22330,
      author       = {Li, C. and Schaeffer, A. and Sequaris, J.M. and Laszlo, K.
                      and Toth, A. and Tombacz, E. and Vereecken, H. and Ji, R.
                      and Klumpp, E.},
      title        = {{S}urface-associated metal catalyst enhances the sorption
                      of perfluorooctanoic acid to multi-walled carbon nanotubes},
      journal      = {Journal of colloid and interface science},
      volume       = {377},
      issn         = {0021-9797},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {PreJuSER-22330},
      pages        = {342 - 346},
      year         = {2012},
      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).},
      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.},
      keywords     = {Adsorption / Aluminum: chemistry / Cobalt: chemistry /
                      Fluorocarbons: chemistry / Hydrogen-Ion Concentration /
                      Magnesium: chemistry / Manganese: chemistry / Nanotubes,
                      Carbon: chemistry / Octanoic Acids: chemistry / Osmolar
                      Concentration / Surface Properties / Fluorocarbons (NLM
                      Chemicals) / Nanotubes, Carbon (NLM Chemicals) / Octanoic
                      Acids (NLM Chemicals) / perfluorooctanoic acid (NLM
                      Chemicals) / Aluminum (NLM Chemicals) / Magnesium (NLM
                      Chemicals) / Manganese (NLM Chemicals) / Cobalt (NLM
                      Chemicals) / J (WoSType)},
      cin          = {IBG-3},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Chemistry, Physical},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:22494685},
      UT           = {WOS:000304432400046},
      doi          = {10.1016/j.jcis.2012.03.038},
      url          = {https://juser.fz-juelich.de/record/22330},
}