COLL 178 |
| Qiuli Lu, Dept. of Civil Engineering, University of Cincinnati, P.O. Box 210071, Cincinnati, OH 45221-0071 and George A Sorial, Civil & Environmental Engineering Department, University of Cincinnati, P.O. Box 210071, Cincinnati, OH 45221-0071. |
| The impact of pore size distribution and molecular oxygen on the adsorption of granular activated carbon (GAC) and activated carbon fibers (ACF) was evaluated in this study. ACF has relatively unique pore size and pore distribution. On the otherhand, granular activated carbon has a wider range of pore size and pore distribution. Anoxic and oxic adsorption of phenol, o-cresol and 2-ethylphenol on F400 and on four types of ACF were conducted. All these adsorption isotherms were found to satisfy Freundlich equation. For anoxic adsorption, where only physical adsorption occurs, adsorption capacity is well controlled by pore size and pore distribution. Adsorptive capacity increases as BET surface area and micropore volume increase. For oxic adsorption, chemical transformation due to polymerization on the surface of the adsorbent makes the increase of adsorptive capacity not necessarily corresponding to the pore size increase. In most cases, adsorptive capacity increases with the presence of molecular oxygen except when the adsorbate molecular size is large and the pore size is relatively small. |
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Adsorption of Macromolecules at Liquid-Solid Interfaces
Division of Colloid and Surface Chemistry |