Interaction of phenol and dopamine with commercial MWCNTs

Ajna Tóth, Andrea Törocsik, E. Tombácz, Erzsébet Oláh, Marc Heggen, Chengliang Li, Erwin Klumpp, Erik Geissler, K. László

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We report the adsorption of phenol and dopamine probe molecules, from aqueous solution with NaCl, on commercial multiwall carbon nanotubes (MWCNT) and on their carboxylated derivative. The nanotubes were fully characterized by high resolution transmission electron microscopy (HRTEM), small angle X-ray scattering (SAXS), potentiometric titration, electrophoretic mobility, and nitrogen adsorption (77. K) measurements. The experimental pollutant isotherms, evaluated using the Langmuir model, showed that only 8-12% and 21-32% of the BET surface area was available for phenol and dopamine, respectively, which is far below the performance of activated carbons. Influence of the pH was more pronounced for the oxidized MWCNT, particularly with dopamine. The strongest interaction and the highest adsorption capacity occurred at pH 3 with both model pollutants on both types of nanotubes. Although the surface area available for adsorption is far lower in MWCNTs than in activated carbons, it is nonetheless substantial. In particular, delayed release of toxic molecules that are either adsorbed on the surface or trapped in the inner bore of such systems could constitute an environmental hazard. The need for further adsorption studies with regard to their environmental aspects is therefore pressing, particularly for MWCNTs in their functionalized state.

Original languageEnglish
Pages (from-to)469-475
Number of pages7
JournalJournal of Colloid and Interface Science
Volume364
Issue number2
DOIs
Publication statusPublished - Dec 15 2011

Fingerprint

Phenol
Phenols
Dopamine
Adsorption
Carbon Nanotubes
Activated carbon
Nanotubes
Carbon nanotubes
Electrophoretic mobility
Molecules
Poisons
High resolution transmission electron microscopy
X ray scattering
Titration
Isotherms
Hazards
Nitrogen
Derivatives

Keywords

  • Adsorption
  • Aqueous phase
  • Multiwall carbon nanotube
  • PH
  • SAXS

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Colloid and Surface Chemistry

Cite this

Interaction of phenol and dopamine with commercial MWCNTs. / Tóth, Ajna; Törocsik, Andrea; Tombácz, E.; Oláh, Erzsébet; Heggen, Marc; Li, Chengliang; Klumpp, Erwin; Geissler, Erik; László, K.

In: Journal of Colloid and Interface Science, Vol. 364, No. 2, 15.12.2011, p. 469-475.

Research output: Contribution to journalArticle

Tóth, A, Törocsik, A, Tombácz, E, Oláh, E, Heggen, M, Li, C, Klumpp, E, Geissler, E & László, K 2011, 'Interaction of phenol and dopamine with commercial MWCNTs', Journal of Colloid and Interface Science, vol. 364, no. 2, pp. 469-475. https://doi.org/10.1016/j.jcis.2011.08.044
Tóth, Ajna ; Törocsik, Andrea ; Tombácz, E. ; Oláh, Erzsébet ; Heggen, Marc ; Li, Chengliang ; Klumpp, Erwin ; Geissler, Erik ; László, K. / Interaction of phenol and dopamine with commercial MWCNTs. In: Journal of Colloid and Interface Science. 2011 ; Vol. 364, No. 2. pp. 469-475.
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