Journal Article

PreJuSER-19343

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Interaction of phenol and dopamine with commercial MWCNTs

Tòth, A. ; Törcsik, A. ; Tombàcz, E. ; Olàh, E. ; Heggen, M.FZJ* ; Li, C. L. ; Klummpp, E. ; Geissler, E. ; Làszlò, K.

2011
Elsevier Amsterdam [u.a.]

This record in other databases:    

Please use a persistent id in citations: doi:10.1016/j.jcis.2011.08.044

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 (77K) 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.

Keyword(s): Adsorption (MeSH) ; Dopamine: chemistry (MeSH) ; Electrophoretic Mobility Shift Assay (MeSH) ; Hydrogen-Ion Concentration (MeSH) ; Microscopy, Electron, Transmission (MeSH) ; Nanotubes, Carbon (MeSH) ; Phenol: chemistry (MeSH) ; Scattering, Radiation (MeSH) ; Thermodynamics (MeSH) ; Nanotubes, Carbon ; Phenol ; J ; Multiwall carbon nanotube (auto) ; Adsorption (auto) ; pH (auto) ; Aqueous phase (auto) ; SAXS (auto)

Note: The support of the FP7 Marie Curie IRSES program COMPOSITUM-Hybrid Nanocomposites (PIRSES-GA-2008-230790) is gratefully acknowledged. This work is related to the scientific program "Development of quality-oriented and harmonized R + D + I strategy and functional model at BME" supported by the New Szechenyi Plan (Project ID: TAMOP-4.2.1/B-09/1/KMR-2010-0002). We are grateful for access to the small angle X-ray camera at the French CRC beam line BM2 at the European Synchrotron Radiation Facility, Grenoble. We express our gratitude to G. Bosznai for his contribution to the gas adsorption measurements, to J. Fekete, P. Jenei, and L. Bezur for their help in UPLC and ICP analysis, respectively, and to M. Kallay for the molecular calculations.

---

Contributing Institute(s):

1. Mikrostrukturforschung (PGI-5)
2. Agrosphäre (IBG-3)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)

Appears in the scientific report 2011

---