Ozone treatment of coal- and coffee grounds-based active carbons: Water vapor adsorption and surface fractal micropores

Journal Article · Tue Sep 15 04:00:00 EDT 1998 · Journal of Colloid and Interface Science

DOI:https://doi.org/10.1006/jcis.1998.5601· OSTI ID:659100

Tsunoda, Ryoichi; Ozawa, Takayoshi; Ando, Junichi ^[1]

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1. Kanagawa Industrial Technology Research Inst., Ebina, Kanagawa (Japan)

Characteristics of the adsorption iostherms of water vapor on active carbons from coal and coffee grounds and those ozonized ones from the surface fractal dimension analysis are discussed. The upswing of the adsorption isotherms in the low relative pressure of coffee grounds-based active carbon, of which isotherms were not scarcely affected on ozonization, was attributed to the adsorption of water molecules on the metallic oxides playing the role of oxygen-surface complexes, which formed the corrugated surfaces on the basal planes of micropore walls with the surface fractal dimension D{sub s} > 2. On the other hand, coal-based active carbon with D{sub s} < 2, which indicated the flat surfaces of micropore walls, showed little effect on the upswing even on ozonization, even though the adsorption amounts of water vapor were increased in the low relative pressure.

• OSTI ID: 659100
• Journal Information: Journal of Colloid and Interface Science, Journal Name: Journal of Colloid and Interface Science Journal Issue: 2 Vol. 205; ISSN 0021-9797; ISSN JCISA5
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
09 BIOMASS FUELS
ACTIVATED CARBON
ADSORPTION ISOTHERMS
BY-PRODUCTS
COAL
COFFEE BEANS
OZONIZATION
WATER VAPOR