Abstract
Bone char is a mixed adsorbent in which carbon is distributed throughout a porous structure of hydroxyapatite. Attempts to relate the performance of bone char with its B.E.T. nitrogen area fail because no account is taken of the heterogeneity of the surface. Careful choice of three different adsorbate solutions has allowed the determination of the total surface area and the individual contribution of the two components. The total surface is measured by adsorption of sodium di-2-ethylhexyl sulfosuccinate (Manoxol OT) from water, the carbon surface by cetyltrimethylammonium bromide (CTAB) from water, and the hydroxyapatite surface by “OT” from benzene. Samples of bone char have been progressively decarbonized from about 8% carbon to nearly zero, and the change in surface properties has been determined as a function of the carbon content. While the carbon surface decreases to zero, the sum of the carbon and hydroxyapatite surface areas remains equal to the B.E.T. nitrogen area.
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