The surface acidity of the technical grade animal charcoal degassed at various temperatures was determined with bases of different strengths. The acidity on the surface of charcoal could be attributed to atleast two surface functional groups. The one which showed maximum decomposition at 300oC. might be a CO2 evolving group. The other which still remained and appreciable amounts even when the charcoal was degassed at 700oC, might be some Co evolving group.
W KEMP ,M A KHAN ,
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