Sorption and chemical transformation of PAHs on coal fly ash. Technical progress report No. 3, May 1--July 31, 1992 [electronic resource]
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| Online Access: |
Online Access |
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| Corporate Authors: | , |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Dept. of Energy ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
1992.
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| Subjects: |
| Abstract: | The results obtained to date indicate that toluene is a useful ̀̀probe solutè̀ for measuring the relative affinities of various fly ash fractions for aromatic solutes. In general, the adsorption isotherms obtained for toluene on fly ash fractions can be fit to a Freundlich adsorption isotherm equation, which implies that the adsorbent surface in question is heterogeneous. For most fly ash fractions studied thus far, the measured heat of adsorption decreases as the quantity of toluene injected onto the column increases. This observation also indicates that the fly ash surfaces are heterogeneous. For a homogeneous (or nearly homogeneous) surface, virtually all adsorption ̀̀sites̀̀ for a particular solute exhibit approximately the same affinity for the solute; hence, the measured heat of adsorption is virtually independent of the amount of solute that is brought into contact with the surface. However, when the surface is heterogeneous, the measured heat of adsorption decreases as the amount of solute is increased; this variation can be used to make inferences regarding surface site energy distributions if certain assumptions and approximations are made. Data obtained to date are summarized. |
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| Item Description: | Published through the Information Bridge: DOE Scientific and Technical Information. 10/01/1992. "doe/pc/91306--3" "DE93000518" Mamantov, G.; Wehry, E.L. |
| Physical Description: | 4 p. : digital, PDF file. |
| Type of Report and Period Covered Note: | Quarterly; |