Abstract

CORTES, Juan C. et al. OXIDATION OF AN ACTIVATED CARBON COMMERCIAL AND CHARACTERIZATION OF THE CONTENT OF SUPERFICIAL ACID GROUPS. Rev.Colomb.Quim. [online]. 2008, vol.37, n.1, pp.55-65. ISSN 0120-2804.

The changes of the surface acid groups of an activated commercial carbon after placing it under oxidation treatment with nitric acid are studied. The time used was in the range 1.5 and 9 hours, the concentrations range was from 4 to 7 molL-1. The study included the determination of immersion entalphy, Boehm´s type titrations, FTIR, and pH at the point of zero charge, pHPZC. It was found that total the acid groups are in a range from 0.207 mmolg-1 to 1.247 mmolg-1, and that they are proportional to the immersion entalphy in NaOH that are between 40 and 54 Jg-1. The pHPZC decreases with the oxidation treatment and have values between 8.3 and 4.3.

Keywords : surface acid groups; immersion entalphy; pHPZC; Boehm´s type titrations.

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