Effects of Molecular Oxygen and pH on the Adsorption of Aniline to Activated Carbon

by Peter Fox, Arizona State Univ, Tempe, AZ, USA,
Kamalesh Pinisetti, Arizona State Univ, Tempe, AZ, USA,

Document Type: Proceeding Paper

Part of: Critical Issues in Water and Wastewater Treatment


This paper examines the influence of molecular oxygen and pH on the adsorption of aniline to F-300 Calgon Carbon. Molecular oxygen increased the adsorptive capacity of GAC for anilines by 250-400% at pH 3, 30-83% at pH 5, 17-42% at pH 9, and 8-45% at pH 11 (higher than those obtained in the absence of molecular oxygen). At pH 7, some of the products formed are poorly adsorbed as evidenced by an increase in UV absorbance in the oxic isotherms as compared to the other isotherms. Oxygen uptake measurements revealed significant consumption of molecular oxygen during the adsorption of aniline compounds. It is speculated that the increase in the GAC adsorptive capacity under oxic conditions was due to the polymerization of these adsorbates on the carbon surface.

Subject Headings: pH | Adsorption | Activated carbon | Soil pollution | Water pollution | Carbon fibers | Polymer | Synthetic materials

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