SORPTION PROPERTIES OF CARBON COMPOSITE-MATERIALS FORMED FROM LAYEREDCLAY-MINERALS

The sorption properties of carbon-composite materials based on montmor illonite and hydrotalcite matrices have been studied using nitrogen ad sorption isotherms and inverse gas chromatography. Carbon composite ma terials derived from both types of inorganic precursors contain pore s tructure accessible for adsorbate molecules. Adsorption capacity per u nit mass of these composite adsorbents is larger in the case of hydrot alcite than in montmorillonite-based materials. Exposing these materia ls to ambient conditions results in their hydration. Subsequent water removal by heating under vacuum increases nitrogen adsorption capacity , which is explained by the opening of the adsorption space. The water content of hydrated samples and its effect on adsorption capacity is greater for the case of hydrotalcite-based materials. No direct relati onship between carbon content and adsorption properties of the materia ls studied is observed.