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Preparation and Characterization of Expanded Graphites by Wet Process

In this work, the characteristics of expanded graphite (EG) are investigated for the possibility of useful applica- tion as oil-adsorbent of EG. The graphite intercalated compounds (GICs) are prepared by the wet process that leads to an inter- calation of intercalant into natural graphites. The graphite intercalate is subjected to the heat treatment in furnace between 600 o C and 900 o C under oxidizing atmosphere for about 1 min. The expansion volume, volatile content, and interlayer dis- tance of EG on different heating temperatures are measured by mass cylinder and X-ray diffraction (XRD). N-dodecane is used for oil adsorption, and morphology of EG before and after oil adsorption is observed by SEM. As a result, the expansion vol- ume and volatile content of EG are increased with increasing the treatment temperature. The oil adsorption capacity is found to be 16-35 g of n-dodecane per the 1 g EG studied. It is then concluded that the wet process of EG is a useful technique for a new adsorbent of oil.