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1 Polish Journal of Chemistry

1 1998

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Structural and surface properties of active carbons oxidized with nitric acid at high temperature

100%

Choma J. , Jaroniec M. , Burakiewicz-Mortka W. , Klinik J. , Olejniczak K.

tom Vol. 72, nr 5

860-868

The effect of oxidation of active carbons with nitric acid at the boiling temperature on their structural and surface properties was analyzed by nitrogen and water vapor adsorption data. Adsorption isotherms on unmodified and oxidized active carbons were measured at 77 K for nitrogen and 298 K for water vapor. This oxidation of active carbons led to farmation of a significant amount of oxygen acidic group on their surface. Simultaneously this oxidation led to a considerable degradation of the porous structure, which is menifested by decreasing: the total surface area, the micropore volume, and the external surface area of mesopores. However, adsorption of water vapor on oxidized active carbons under low and moderate pressures is considerably greater than on unmodified carbons.