Abstract
A direct transmission IR analytical technique capable of distinguishing quali aswell as quantitative spectral differences has been applied to a series of activecarbons. The amount of acidic and basic groups was also evaluated by standard neutralizationtechniques. For the carbons with acidic and basic surface properties three broad butdistrinctive bands were observed, centred around 1735, 1585 and 1240 cm-1 meanwhile acarbon without strong acidic oxides showed only the 1585 and 1240 cm-1 bands. A reviewof the literature on previously reported IR spectra of several carbonaceousmaterials including: coals, carbon blacks, graphite, chars and active carbons is presented, discussed and interpreted together with the findings of the present study.A linear direct correlation was found between the intensities of the 1585 and 1240 cm-1 absorption bands for the carbon which is basic in nature. The results areinterpreted as a confirmation of the γ-pyronic like structures proposed by Boehm for the basic oxides.
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