Equilibrium and Heat of Adsorption for Organic Vapors and Activated Carbons

Determination of the adsorption properties of novel activated carbons is important to develop new air quality control technologies that can solve air quality problems in a more environmentally sustainable manner. Equilibrium adsorption capacities and heats of adsorption are important parameters for...

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Bibliographic Details
Published in:Environmental science & technology 2005-08, Vol.39 (15), p.5864-5871
Main Authors: Ramirez, David, Qi, Shaoying, Rood, Mark J, Hay, K. James
Format: Article
Language:English
Subjects:
01 COAL, LIGNITE, AND PEAT
ACTIVATED CARBON
ADSORBENTS
Adsorption
ADSORPTION HEAT
ADSORPTION ISOTHERMS
Air Pollutants - analysis
Air pollution
Applied sciences
Atmospheric pollution
Carbon
CARBON FIBERS
Charcoal - chemistry
Chemistry
COAL
Exact sciences and technology
Gases
General and physical chemistry
General processes of purification and dust removal
Heat
Hot Temperature
Models, Chemical
ORGANIC COMPOUNDS
Pollution
Prevention and purification methods
Solid-gas interface
SORPTIVE PROPERTIES
Surface physical chemistry
TEMPERATURE DEPENDENCE
VAPORS
Volatilization
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Summary:Determination of the adsorption properties of novel activated carbons is important to develop new air quality control technologies that can solve air quality problems in a more environmentally sustainable manner. Equilibrium adsorption capacities and heats of adsorption are important parameters for process analysis and design. Experimental adsorption isotherms were thus obtained for relevant organic vapors with activated carbon fiber cloth (ACFC) and coal-derived activated carbon adsorbents (CDAC). The Dubinin−Astakhov (DA) equation was used to describe the adsorption isotherms. The DA parameters were analytically and experimentally shown to be temperature independent. The resulting DA equations were used with the Clausius−Clapeyron equation to analytically determine the isosteric heat of adsorption (ΔH s) of the adsorbate−adsorbent systems studied here. ACFC showed higher adsorption capacities for organic vapors than CDAC. ΔH s values for the adsorbates were independent of the temperature for the conditions evaluated. ΔH s values for acetone and benzene obtained in this study are comparable with values reported in the literature. This is the first time that ΔH s values for organic vapors and these adsorbents are evaluated with an expression based on the Polanyi adsorption potential and the Clausius−Clapeyron equation.
ISSN:0013-936X
1520-5851
DOI:10.1021/es048144r