Mechanism of Methylene Blue adsorption on hybrid laponite-multi-walled carbon nanotube particles

Maryna Manilo, Nikolai Lebovka, S. Bárány

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The kinetics of adsorption and parameters of equilibrium adsorption of Methylene Blue (MB) on hybrid laponite-multi-walled carbon nanotube (NT) particles in aqueous suspensions were determined. The laponite platelets were used in order to facilitate disaggregation of NTs in aqueous suspensions and enhance the adsorption capacity of hybrid particles for MB. Experiments were performed at room temperature (298K), and the laponite/NT ratio (X l) was varied in the range of 0-0.5. For elucidation of the mechanism of MB adsorption on hybrid particles, the electrical conductivity of the system as well as the electrokinetic potential of laponite-NT hybrid particles were measured. Three different stages in the kinetics of adsorption of MB on the surface of NTs or hybrid laponite-NT particles were discovered to be a fast initial stage I (adsorption time t =0-10min), a slower intermediate stage II (up to t =120min) and a long-lasting final stage III (up to t =24hr). The presence of these stages was explained accounting for different types of interactions between MB and adsorbent particles, as well as for the changes in the structure of aggregates of NT particles and the long-range processes of restructuring of laponite platelets on the surface of NTs. The analysis of experimental data on specific surface area versus the value of X l evidenced in favor of the model with linear contacts between rigid laponite platelets and NTs. It was also concluded that electrostatic interactions control the first stage of adsorption at low MB concentrations.

Original languageEnglish
JournalJournal of Environmental Sciences (China)
DOIs
Publication statusAccepted/In press - Apr 7 2015

Fingerprint

Carbon Nanotubes
Methylene Blue
Carbon nanotubes
adsorption
Adsorption
Nanotubes
Platelets
Suspensions
kinetics
Kinetics
Coulomb interactions
laponite
carbon nanotube
particle
Specific surface area
Adsorbents
electrical conductivity
surface area
nanotube

Keywords

  • Adsorption
  • Kinetics
  • Laponite platelets
  • Methylene Blue
  • Multi-walled carbon nanotubes
  • Zeta potential

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Mechanism of Methylene Blue adsorption on hybrid laponite-multi-walled carbon nanotube particles. / Manilo, Maryna; Lebovka, Nikolai; Bárány, S.

In: Journal of Environmental Sciences (China), 07.04.2015.

Research output: Contribution to journalArticle

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