Multilayer adsorption on fractal surfaces

Péter Vajda, A. Felinger

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Multilayer adsorption is often observed in liquid chromatography. The most frequently employed model for multilayer adsorption is the BET isotherm equation. In this study we introduce an interpretation of multilayer adsorption measured on liquid chromatographic stationary phases based on the fractal theory. The fractal BET isotherm model was successfully used to determine the apparent fractal dimension of the adsorbent surface. The nonlinear fitting of the fractal BET equation gives us the estimation of the adsorption equilibrium constants and the monolayer saturation capacity of the adsorbent as well. In our experiments, aniline and proline were used as test molecules on reversed phase and normal phase columns, respectively. Our results suggest an apparent fractal dimension 2.88-2.99 in the case of reversed phase adsorbents, in the contrast with a bare silica column with a fractal dimension of 2.54.

Original languageEnglish
Pages (from-to)121-127
Number of pages7
JournalJournal of Chromatography A
Volume1324
DOIs
Publication statusPublished - Jan 10 2014

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Fractals
Adsorption
Multilayers
Fractal dimension
Adsorbents
Isotherms
Liquid chromatography
Equilibrium constants
Proline
Silicon Dioxide
Monolayers
Liquid Chromatography
Molecules
Liquids
Experiments

ASJC Scopus subject areas

  • Analytical Chemistry
  • Organic Chemistry
  • Biochemistry

Cite this

Multilayer adsorption on fractal surfaces. / Vajda, Péter; Felinger, A.

In: Journal of Chromatography A, Vol. 1324, 10.01.2014, p. 121-127.

Research output: Contribution to journalArticle

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