Adsorption of Nitrogen on Thermally Treated Peat Soils: The Role of Energetic and Geometric Heterogeneity

Adsorption of Nitrogen on Thermally Treated Peat Soils: The Role of Energetic and Geometric Heterogeneity

We investigate adsorption isotherms of nitrogen at 80 K on several peat soils. In addition to natural soil samples we also study samples thermally treated at 50, 100, and 150°C. The experimental adsorption isotherms are used to evaluate the surface fractal dimension and the energy distribution funct...

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Veröffentlicht in:Journal of colloid and interface science 1999-11, Vol.219 (1), p.1-10
Hauptverfasser: Sokołowska, Zofia, Hajnos, Mieczysław, Borówko, Małgorzata, Sokołowski, Stefan
Format: Artikel
Sprache:eng
Schlagworte:
01 COAL, LIGNITE, AND PEAT
ADSORPTION ISOTHERMS
adsorption on soils
Chemistry
ENERGY SPECTRA
Exact sciences and technology
fractal dimension
General and physical chemistry
heterogeneity
HETEROGENEOUS EFFECTS
mercury porosimetry
NITROGEN
PEAT
peat soils
Solid-gas interface
Surface physical chemistry
SURFACE PROPERTIES
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Zusammenfassung:We investigate adsorption isotherms of nitrogen at 80 K on several peat soils. In addition to natural soil samples we also study samples thermally treated at 50, 100, and 150°C. The experimental adsorption isotherms are used to evaluate the surface fractal dimension and the energy distribution functions. Moreover, for some samples we have also determined the pore size distributions from mercury intrusion data. We compare the surface fractal dimensions evaluated from the mercury intrusion data and from adsorption isotherms and discuss how the thermal treatment changes the energetic heterogeneity of the samples.
ISSN:0021-9797
1095-7103
DOI:10.1006/jcis.1999.6462