||Molecular Oxygen and the Adsorption of Phenols: Effect of Functional Groups.
Vidic, R. D. ;
Suidan, M. T. ;
Sorial, G. A. ;
Brenner, R. C. ;
||Environmental Protection Agency, Cincinnati, OH. Risk Reduction Engineering Lab. ;Pittsburgh Univ., PA. ;Cincinnati Univ., OH. Dept. of Civil and Environmental Engineering.
Water pollution control ;
Granular activated carbon treatment ;
Surface chemistry ;
Nitro compounds ;
Performance evaluation ;
Chemical reaction mechanisms
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As a result of more stringent effluent and water quality standards established by both the Federal and state governments, activated carbon adsorption emerged as one of the best available technologies for achieving compliance with these new regulations. This study reveals that the presence of molecular oxygen (oxic conditions) has a significant impact on the exhibited adsorptive capacity of granular activated carbon (GAC) for several phenolic compounds. The increase in the GAC adsorptive capacity under oxic conditions results from polymerization of these adsorbates on the carbon surface. The mechanism of polymer formation is through oxidative coupling of phenolic molecules. The extent of an increase in the GAC adsorptive capacity is in accordance with the ease of oxidation of these compounds. However, substituting a nitro group on the parent phenol molecule suppressed polymerization reactions and no increase in the GAC adsorptive capacity was observed under oxic conditions for these substituents.