Heterogeneity of multiwalled carbon nanotubes based on adsorption of simple aromatic compounds from aqueous solutions

Przemysław Podkościelny, Ajna Tóth, Barbara Berke, K. László, Krzysztof Nieszporek

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The surface heterogeneity of multiwalled carbon nanotubes (MWCNTs) is studied on the basis of adsorption isotherms from dilute aqueous phenol and dopamine solutions at various pH values. The generalized Langmuir-Freundlich isotherm equation was applied to investigate the cooperative effect of the surface heterogeneity and the lateral interactions between the adsorbates. The theoretical isosteric heats of adsorption were obtained assuming that the heat of adsorption profile reveals both the energetic heterogeneity of the adsorption system and the strength of the interactions between the neighboring molecules. The adsorption energy distribution functions were calculated by using algorithm based on a regularization method. The great advantage of this method is that the regularization makes no assumption about the shape of the obtained energy distribution functions. Analysis of the isosteric heats of adsorption for MWCNTs showed that the influence of the surface heterogeneity is much stronger than the role of the lateral interactions. The most typical adsorption heat is 20-22 kJ/mol for both phenol and dopamine. After purification of nanotubes, heat value for phenol dropped to 16-17 kJ/mol. The range of the energy distribution is only slightly influenced by the surface chemistry of the nanotubes in the aqueous conditions.

Original languageEnglish
Pages (from-to)789-800
Number of pages12
JournalAdsorption
Volume20
Issue number5-6
DOIs
Publication statusPublished - 2014

Fingerprint

Multiwalled carbon nanotubes (MWCN)
aromatic compounds
Aromatic compounds
carbon nanotubes
aqueous solutions
Adsorption
adsorption
Phenol
Phenols
heat
phenols
dopamine
energy distribution
Nanotubes
Distribution functions
Dopamine
nanotubes
isotherms
distribution functions
Adsorbates

Keywords

  • Dopamine
  • Heat of adsorption
  • Heterogeneity
  • Multiwalled carbon nanotubes
  • pH
  • Phenol

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Surfaces and Interfaces
  • Chemistry(all)

Cite this

Heterogeneity of multiwalled carbon nanotubes based on adsorption of simple aromatic compounds from aqueous solutions. / Podkościelny, Przemysław; Tóth, Ajna; Berke, Barbara; László, K.; Nieszporek, Krzysztof.

In: Adsorption, Vol. 20, No. 5-6, 2014, p. 789-800.

Research output: Contribution to journalArticle

Podkościelny, Przemysław ; Tóth, Ajna ; Berke, Barbara ; László, K. ; Nieszporek, Krzysztof. / Heterogeneity of multiwalled carbon nanotubes based on adsorption of simple aromatic compounds from aqueous solutions. In: Adsorption. 2014 ; Vol. 20, No. 5-6. pp. 789-800.
@article{acdee855edff4b17a9dab5df6078eacf,
title = "Heterogeneity of multiwalled carbon nanotubes based on adsorption of simple aromatic compounds from aqueous solutions",
abstract = "The surface heterogeneity of multiwalled carbon nanotubes (MWCNTs) is studied on the basis of adsorption isotherms from dilute aqueous phenol and dopamine solutions at various pH values. The generalized Langmuir-Freundlich isotherm equation was applied to investigate the cooperative effect of the surface heterogeneity and the lateral interactions between the adsorbates. The theoretical isosteric heats of adsorption were obtained assuming that the heat of adsorption profile reveals both the energetic heterogeneity of the adsorption system and the strength of the interactions between the neighboring molecules. The adsorption energy distribution functions were calculated by using algorithm based on a regularization method. The great advantage of this method is that the regularization makes no assumption about the shape of the obtained energy distribution functions. Analysis of the isosteric heats of adsorption for MWCNTs showed that the influence of the surface heterogeneity is much stronger than the role of the lateral interactions. The most typical adsorption heat is 20-22 kJ/mol for both phenol and dopamine. After purification of nanotubes, heat value for phenol dropped to 16-17 kJ/mol. The range of the energy distribution is only slightly influenced by the surface chemistry of the nanotubes in the aqueous conditions.",
keywords = "Dopamine, Heat of adsorption, Heterogeneity, Multiwalled carbon nanotubes, pH, Phenol",
author = "Przemysław Podkościelny and Ajna T{\'o}th and Barbara Berke and K. L{\'a}szl{\'o} and Krzysztof Nieszporek",
year = "2014",
doi = "10.1007/s10450-014-9622-z",
language = "English",
volume = "20",
pages = "789--800",
journal = "Adsorption",
issn = "0929-5607",
publisher = "Springer Netherlands",
number = "5-6",

}

TY - JOUR

T1 - Heterogeneity of multiwalled carbon nanotubes based on adsorption of simple aromatic compounds from aqueous solutions

AU - Podkościelny, Przemysław

AU - Tóth, Ajna

AU - Berke, Barbara

AU - László, K.

AU - Nieszporek, Krzysztof

PY - 2014

Y1 - 2014

N2 - The surface heterogeneity of multiwalled carbon nanotubes (MWCNTs) is studied on the basis of adsorption isotherms from dilute aqueous phenol and dopamine solutions at various pH values. The generalized Langmuir-Freundlich isotherm equation was applied to investigate the cooperative effect of the surface heterogeneity and the lateral interactions between the adsorbates. The theoretical isosteric heats of adsorption were obtained assuming that the heat of adsorption profile reveals both the energetic heterogeneity of the adsorption system and the strength of the interactions between the neighboring molecules. The adsorption energy distribution functions were calculated by using algorithm based on a regularization method. The great advantage of this method is that the regularization makes no assumption about the shape of the obtained energy distribution functions. Analysis of the isosteric heats of adsorption for MWCNTs showed that the influence of the surface heterogeneity is much stronger than the role of the lateral interactions. The most typical adsorption heat is 20-22 kJ/mol for both phenol and dopamine. After purification of nanotubes, heat value for phenol dropped to 16-17 kJ/mol. The range of the energy distribution is only slightly influenced by the surface chemistry of the nanotubes in the aqueous conditions.

AB - The surface heterogeneity of multiwalled carbon nanotubes (MWCNTs) is studied on the basis of adsorption isotherms from dilute aqueous phenol and dopamine solutions at various pH values. The generalized Langmuir-Freundlich isotherm equation was applied to investigate the cooperative effect of the surface heterogeneity and the lateral interactions between the adsorbates. The theoretical isosteric heats of adsorption were obtained assuming that the heat of adsorption profile reveals both the energetic heterogeneity of the adsorption system and the strength of the interactions between the neighboring molecules. The adsorption energy distribution functions were calculated by using algorithm based on a regularization method. The great advantage of this method is that the regularization makes no assumption about the shape of the obtained energy distribution functions. Analysis of the isosteric heats of adsorption for MWCNTs showed that the influence of the surface heterogeneity is much stronger than the role of the lateral interactions. The most typical adsorption heat is 20-22 kJ/mol for both phenol and dopamine. After purification of nanotubes, heat value for phenol dropped to 16-17 kJ/mol. The range of the energy distribution is only slightly influenced by the surface chemistry of the nanotubes in the aqueous conditions.

KW - Dopamine

KW - Heat of adsorption

KW - Heterogeneity

KW - Multiwalled carbon nanotubes

KW - pH

KW - Phenol

UR - http://www.scopus.com/inward/record.url?scp=84905667409&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84905667409&partnerID=8YFLogxK

U2 - 10.1007/s10450-014-9622-z

DO - 10.1007/s10450-014-9622-z

M3 - Article

VL - 20

SP - 789

EP - 800

JO - Adsorption

JF - Adsorption

SN - 0929-5607

IS - 5-6

ER -