The main aim of oxidation of the carbon surface is obtaining a more hydrophilic surface structure with a relatively large number of oxygen-containing surface groups. For other carbon-supported catalyst, the modification of carbon surface results in significant changes of the loading capacity and the catalytic properties. The formation of surface functional groups may come as a result of the direct interaction of the modifying agent during the modification of the initial precursor fiber, carbonization, and activation. The oxidative treatment of carbon materials is the frequently used method in the production of carbon based ion-exchangers . In this paper, the chemical modification of pitch-based activated carbon fibers with nitric acid is carried out in order to increase the metal adsorption capacity by inducing surface oxygen-containing groups. Another modification is conducted with sodium hydroxide in order to compare with the result of above modification.
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