Record Display for the EPA National Library Catalog

RECORD NUMBER: 583 OF 1176

OLS Field Name OLS Field Data
Main Title Impact of Oxygen Mediated Oxidative Coupling on Adsorption Kinetics.
Author Vidic, R. D. ; Suidan, M. T. ; Brenner., R. C. ;
CORP Author Environmental Protection Agency, Cincinnati, OH. Risk Reduction Engineering Lab. ;Cincinnati Univ., OH. ;Pittsburgh Univ., PA.
Publisher c1994
Year Published 1994
Report Number EPA/600/J-94/136;
Stock Number PB94-159407
Additional Subjects Oxygenation ; Polymerization ; Phenols ; Adsorption ; Water pollution control ; Reprint ; Reaction kinetics ; Surface chemistry ; Diffusion ; Activated carbon treatment ; Granular activated carbon treatment ;
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB94-159407 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 09/01/1994
Collation 8p
Abstract
The presence of molecular oxygen in the test environment promotes oxidative coupling (polymer formation) of phenolic compounds on the surface of granular activated carbon (GAC). Both adsorption equilibria and adsorption kinetics are affected by these chemical reactions. Lack of molecular oxygen interference with adsorption kinetics during the initial phase (first 12 h) of adsorbent-adsorbate contact, observed for the experimental conditions tested, can be explained by the lower rate of adsorbate polymerization when compared to the rate of pure adsorption. The homogeneous surface diffusion model (HSDM) adequately describes adsorption kinetics under anoxic conditions, but it fails to accurately predict experimental data collected in the presence of molecular oxygen. For the experimental conditions tested in the study, GAC particle size did not influence the magnitude of the surface diffusion coefficient. However, the increase in the initial adsorbate concentration yielded an increase in the surface diffusion coefficient. This may be attributed to a decrease in the adsorption forces for higher surface coverage.