Abstract
The adsorption equilibria of phenol on the surface-modified and surface-unmodified electric carbon black in aqueous solutions have been studied. The carbon black used as an adsorbent was Electric Conductive carbon black (Lion Aquezo Co.). In order to clarify the relationship between the surface-chemical structure and the adsorption character of adsorbents, this carbon black was treated with nitric acid, hydrogen peroxide, dried air, or hydrogen gas. The adsorption characteristics were in good agreement with a Freundlich-type isotherm. The modification of the surfaces of the carbon black caused changes in the amounts of phenol adsorbed by them: H 2 treated > Unmodified > Dried air at 300°C > Dried air at 350°C > H 2 O 2 > 1N HNO 3 > 4N HNO 3 > 13.2N HNO 3 The adsorbed amount is closely related to the nature of the surface oxides on the modified carbon black.
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