Study of the Physical and Structural Properties of Some Local Mineral Clays and Effect of Doping with Chromium Oxide

Abstract

Chemical composition, physical properties and structural characterization of local natural clays which have been collected from Aski Mosul village, area around Mosul city/ Iraq, were studied. The study approach is based on using x-ray diffraction, x-ray florescence, atomic absorption, thermal gravimetric analysis, differential scanning calorimetry, infrared spectroscopy, instrumental and classical chemical analysis techniques. Chemical composition studies of the natural sample clearly indicating the presence of large amounts of silica and calcium oxide in addition to aluminum oxide and other minor oxides. Moreover, it is shown that such sample yields (⁓5%) amorphous silica on treating with basic medium. The results were compared with those obtained from acidicaly treated and chromium oxide doped clay samples. On comparison the physical properties (e.g density, porosity, water absorption, pore size, and capillary action), it seems that the treated clay sample has low density and high porosity and permeability. Moreover, the doped samples are more dens than others. Such variation because of the elimination of carbonate compounds on treating and doping processes. Four samples were prepared in order to be more active and selective adsorbent materials. Soxhlate fractionating techniques were set for all the above types of adsorbents using four eluants gradually increased in polarity. The fractionation results showed significant variations in the fractions isolated according to their polarities as indicated by percentage results.

Keywords

• Mineral clays,Virgin olive oil

References

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